Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400)

Extend the boating season and protect your engine against surprise cold snaps before winterization with the Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) from Nomadic Supply Company®. The Xtreme Heaters 400W IP68 Engine Compartment Heater is an ideal solution for maintaining warmth in smaller vessels, such as runabouts, ski boats, fishing boats, sail boats, and pocket cruisers. These heaters are designed to provide reliable freeze protection in confined areas, ensuring that your boat remains operational even in harsh winter conditions.

In addition to engine compartments, the Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) also works well in smaller spaces, such as bathrooms, under kitchen cabinets, and around freshwater lines and AC units, ensuring these areas are protected from freezing. If your boat is stored on a lift or trailer, we recommend choosing a heater one size larger than the suggested model or a second heater for optimal performance.

As product and industry experts, our goal for the Xtreme Heaters 400W IP68 Engine Compartment Heater was to produce a highly safe, dependable, and efficient option on the market. With our heaters, you can confidently stay on the water for extended periods. If your boat is docked on a lift or trailer, you may need to increase the wattage of the heater by one level or add a second heater to compensate for heat loss. Make sure to cover the fresh air vents to prevent air from escaping and the cold from coming in, resulting in a more efficient heater and saving you money.

Because boats vary in materials, insulation, and design, it’s essential to carefully assess your specific needs and climate to determine the most suitable heater. In some cases, depending on the size and configuration of your boat, more than one heater may be necessary to ensure adequate protection​​.

The Xtreme Heater was designed specifically with safety in mind and has been independently tested to meet the ignition protection requirements of the ABYC E11, the USCG, ISO 8846, SAE J1171, and to satisfy MILITARY standards. As of 2022, we have UL 1278.

Why Use a Bilge or Engine Compartment Heater at all? If you’re like us, you hate to see the boating season end. But it doesn’t have to, with one of our Xtreme Boat Heaters installed in your boat! Have you ever been caught off guard by an early winter freeze? Have you ever de-winterized the boat to enjoy an early warm spell, only to have to winterize the boat once again for that last late spring freeze? Freezing temperatures can damage critical equipment in your boat and put a drain on your battery system if you’re caught unprepared. The result can be thousands of dollars in repair bills. Don’t be “that guy” who takes chances with unsafe products such as light bulbs and household space heaters or other inferior products in your bilge. Take a look at what can happen. Designed specifically to be safe on your boat, Xtreme bilge heaters prevent freeze damage to your boat’s engine and other critical components in your engine compartment without the fire hazard standard household products present.

Xtreme: The Heater Built Specifically for Your Boat Xtreme Heaters, where innovation meets excellence. Our unwavering mission is simple: to be the absolute best in the industry. We don’t just aim for greatness; we define it. With a relentless dedication to crafting the safest, most reliable, and efficient heating solutions, we stand as the pinnacle of quality and performance. When you choose Xtreme Heaters, you’re choosing nothing but the best, ensuring your journey on the water is not just enjoyable, but truly exceptional. We designed it to last the life of your boat, so instead of following tedious winterization procedures every time the weatherman brings the bad news of a freeze, simply plug in your Xtreme Heater for fully automatic, completely safe freeze protection and peace of mind. Learn about how Xtreme heaters work.

Safety Xtreme heaters were the first product of it’s type to be tested by the independent IMANA Labs, to meet or exceed Coast Guard and ABYC standards. We then went further, testing our products against MILSPEC (Military Specification) ratings for heat, cold, moisture, and vibration. We passed all with flying colors, which has earned our product the trust of our military, where it is installed in special operations vessels, as well as homeland security vessels across our nation.

Efficiency We chose modern, efficient, PTC (Positive Temperature Coefficient) technology for the core of our heaters. PTC heaters are self-regulating, offering safety and efficiency gains unmatched by older style, resistant element heaters.

Reliability Every component in our range of bilge heaters is specifically selected for the demanding marine environment. A fully anodized aluminum casing, a sealed electronics module, a marine-rated power cord, and our unique waterproof fan guarantee that our heater is the safest and most dependable engine compartment heater on the market, promising years of seamless operation.

Compact and Flexible Xtreme boat heaters are renowned for their compact design, offering the most space-efficient bilge heaters on the market. They boast versatile mounting options, allowing for vertical, horizontal, or even upside-down installation. The optional Quick Release Bracket enables easy installation for the winter and equally simple removal for the boating season, all without the need for tools.

Ignition Protection Requirements: Tested and passed the ignition protection requirements to determine compliance for electrical components as stated in the ISO Standard ISO 8846, as well as the Electrical System Standard, Title 33 CFR, Part 183, Subpart I, Section 183.410, SAE J1171and the ABYC Certification Handbook.

Military Testing – Exceeding the Rest! In addition to standard ignition protection safety standards, the Xtreme Heater has passed MIL-SPEC testing (MIL-STD-810E Method 514.4 Vibration ) to prove that it is tough enough to make it in the most demanding environments. The MIL-SPEC (MILITARY) tests are the hardest to pass and are intended for all types of military equipment.

Testing Procedures and the Xtreme Heater’s Results The Xtreme Heater has been tested for the ignition protection requirements of the ABYC, the USCG, ISO 8846 and SAE J1171 to determine compliance of the item to the Ignition Protection requirements for electrical components as stated in the ISO Standard ISO 8846 as well as the Electrical System Standard, Title 33 CFR, Part 183, Subpart I, Section 183.410, SAE J1171and the ABYC Certification Handbook.

Why You Need an Xtreme Heaters Air Heater to Protect Your RV:

Problem: Winter Risks to Your RV or Camper As temperatures drop, your RV or camper’s water tanks, hot water heater, plumbing, batteries, and other critical components are at serious risk of freezing. When water freezes inside your pipes, tanks, or other systems, it can lead to costly, and sometimes irreversible, damage. For most RV owners, the go-to solution is winterization-calling up the mechanic to drain everything and prepare the RV for months of storage. This often comes with a hefty bill for all that maintenance, and worst of all, you don’t get to use your RV for the entire season. But what if you didn’t have to shut down your RV all winter? That’s exactly why we created Xtreme Heaters-built by RV enthusiasts, for RV enthusiasts-because we understand the problem and wanted a better solution.

Solution: Xtreme Heaters Our Xtreme Heaters are built to protect your RV’s most vital components, like the engine, batteries, water tanks, hot water heaters, hoses, pumps, and plumbing systems-by keeping key areas at a safe temperature, even when it’s freezing outside. With an Xtreme Heater installed, you can keep your RV ready to go all year round, without dealing with expensive winterization and maintenance costs. Continue enjoying road trips and adventures while others are stuck waiting for warmer weather to return. They’re also perfect if your RV is skirted and being used all winter, as they help keep all pipes and plumbing systems from freezing damage, ensuring a hassle-free experience throughout the colder months.

How It Works The Xtreme Heater is installed in strategic locations within your RV, compartments, storage areas for water tanks, and plumbing spaces, where it continuously monitors the surrounding temperature. When the temperature drops to 40°F, the heater automatically turns on and raises the temperature. It turns off once the temperature reaches 55°F, ensuring a safe range that prevents freezing. The heater circulates warm air around the area, ensuring that all critical components, such as generators, batteries, water tanks, hot water heaters, freshwater wash-down systems, and hoses, remain above freezing and fully protected. Its automatic operation makes it both energy-efficient and reliable, eliminating the risk of frozen systems and allowing you to protect your RV effortlessly.

Why Choose Xtreme Heaters?

• Trusted Performance: Our heaters are tested and proven to operate reliably in the harshest conditions. Designed specifically for challenging environments, they are built to handle vibrations, moisture, and tough conditions inside RVs and campers.

• Safe and Effective: Equipped with automatic thermostats, Xtreme Heaters only activate when needed, keeping energy usage low while ensuring your RV is protected from freezing temperatures. They are tested and certified for use in enclosed spaces where safety is crucial.

• Protects Critical Systems: An Xtreme Heater keeps your engine, belts, hoses, plumbing systems, and water tanks from freezing and cracking. It also protects your RV’s batteries, ensuring they remain functional and ready, even in the coldest weather. By maintaining a safe temperature, it also protects your hot water heaters and fresh water wash-down systems from freeze damage, so your RV stays fully operational all winter.

• Extended Travel Season: By preventing freeze damage, you can keep using your RV in the colder months for camping, road trips, or just enjoying the freedom of the open road. No more shutting down for winter!

• Complements Your Winter Maintenance Program: Whether you fully winterize your RV or plan to keep using it throughout the winter, an Xtreme Heater is an essential addition to your winter maintenance routine. It provides extra protection for your RV’s plumbing, and other key systems, reducing risks and making winter care easier. It’s especially useful if your RV is skirted and lived in all winter, as it prevents pipes from freezing and keeps everything running smoothly.

Reliable Freeze Protection and Heating Solutions for Your RV, Camper, Motorhome, and Coach

Ensure your adventures are comfortable and worry-free with Xtreme Heaters’ specialized heating solutions for RVs, campers, motorhomes, and coaches. Our RV heaters provide essential freeze protection and climate control, safeguarding your vehicle and enhancing your travel experience.

Comprehensive Freeze Protection

Our RV heaters are designed to keep your RV basement warm enough to prevent freeze damage. They are perfect for use in basements, wet lockers, and battery compartments, providing protection for lithium batteries and preventing freezing under skirted 5th wheel trailers. Trust our camper heating solutions to maintain optimal temperatures, ensuring your vehicle remains functional and protected.

Space Heaters for Living Areas

Stay comfortable and protect your pipes and fixtures from freezing with our efficient space heaters. Ideal for use in living areas, these compact camper heaters provide consistent warmth, making your RV or camper cozy and safe in any weather. Enjoy peace of mind knowing your vehicle’s plumbing and fixtures are protected from freezing temperatures.

Essential Portable RV Accessories

• Quick-Release Brackets: Simplify installation and maintenance with our easy-to-use quick-release brackets.
• Freeze Spray for Testing: Efficiently test your heating systems with our freeze spray, ensuring optimal performance before you embark on your journey.

Off-Grid and All-Season Heating Solutions

Our energy-efficient RV systems are perfect for boondocking and off-grid heating, ensuring you stay warm without draining your power supply. Our all-season RV equipment is designed to withstand the rigors of travel and varying weather conditions, providing reliable motorhome climate control year-round.

Why Choose Xtreme Heaters?

• Comprehensive Freeze Protection: Protect all areas of your RV, camper, motorhome, or coach from freezing temperatures.
• Efficient Climate Control: Maintain a comfortable living environment with our space heaters.
• Durable and Reliable: Our heaters are built to withstand the rigors of travel and varying weather conditions.
• Convenient Accessories: Enhance your heating system’s functionality with our specialized portable RV accessories.

Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) Applications:

• RV and camper basement freeze protection
• Wet locker and battery compartment heating
• Under skirted 5th wheel trailer freeze prevention
• Space heaters for living areas

Trust Xtreme Heaters for Superior RV and Camper Heating Solutions

Explore our collection of RV and camper heaters and accessories today. Xtreme Heaters is dedicated to providing high-quality, energy-efficient RV systems that ensure your vehicle remains protected and comfortable in any climate.

Why You Need an Xtreme Heaters Air Heater to Protect Your Boat:

Problem: Winter Risks to Your Boat As the temperatures start to drop, your boat’s engine, plumbing, and other important components are at serious risk of freezing. When water freezes inside your engine block, manifolds, or other systems, it can lead to costly, and sometimes irreversible, damage. For most boat owners, the go-to solution is winterization-calling up the mechanic to drain everything and store the boat for months. They hit you with the hefty bill for all that maintenance, and worst of all, you don’t get to use your boat for the entire season. But what if you didn’t have to shut down your boat all winter? That’s exactly why we invented Xtreme Heaters-built by boaters, for boaters-because we understand the problem and wanted a better solution.

Solution: Xtreme Heaters Bilge Heater Our Xtreme Heaters are built to protect your boat’s most vital components-like the engine, batteries, belts, hoses, pumps, and plumbing systems-by keeping the engine compartment at a safe temperature, even when it’s freezing outside. With a bilge heater installed, you can keep your boat ready to go all year round, without dealing with expensive winterization and maintenance costs. Stay out on the water longer and enjoy your investment all winter while others are stuck at the dock, waiting for the season to return.

How It Works The Xtreme Heaters bilge heater is installed directly in your boat’s engine compartment, where it continuously monitors the surrounding temperature. When the temperature drops to 40°F, the heater automatically turns on and raises the temperature within the compartment. It turns off once the temperature reaches 55°F, ensuring a safe range that prevents freezing. The heater circulates warm air around the engine room (bilge compartment), ensuring that all critical components, such as the engine, batteries, hoses, and belts, remain above freezing and fully protected. Its automatic operation makes it both energy-efficient and reliable, eliminating the risk of frozen systems and allowing you to protect your boat effortlessly.

Why Choose Xtreme Heaters?

• Trusted Performance: Our heaters are tested and proven to operate reliably in the harshest conditions. Designed specifically for marine environments, they are built to handle the vibrations, moisture, and tough conditions inside a boat’s engine compartment.
• Safe and Effective: Equipped with automatic thermostats, Xtreme Heaters only activate when needed, keeping energy usage low while ensuring your boat is protected from freezing temperatures. They are tested and certified for use in engine spaces which can contain explosive fumes.
• Protects Critical Systems: A bilge heater keeps your engine, belts, and hoses from freezing and cracking. It also protects your boat’s batteries, ensuring they remain functional and ready, even in the coldest weather.
• Extended Boating Season: By preventing freeze damage, you can keep using your boat in the colder months for fishing, cruising, or just enjoying the water. No more shutting down for winter!
• Complements Your Winter Maintenance Program: Whether you fully winterize your boat or plan to keep using it throughout the winter, an Xtreme Heaters bilge heater is an essential addition to your winter maintenance routine. It provides extra protection for your boat’s engine and other key systems, reducing risks and making winter care easier.

Heater Sizes and Boat Compatibility We offer a range of Xtreme Heaters bilge heaters to fit different boat sizes and engine compartments, ensuring optimal performance:

• Xtreme Heaters 400W IP68 Engine Compartment Heater (XHeat-400): Ideal for boats up to 24 feet with compact engine compartments or single-engine setups.
• Xtreme Heaters 600W IP68 Engine Compartment Heater (XXHEAT-600): Perfect for boats between 20 and 28 feet, including most runabouts, cruisers, and fishing boats with twin-engine compartments or larger single-engine spaces.
• Xtreme Heaters 800W IP68 Engine Compartment Heater (XXXHeat-800): Designed for boats over 28 feet with spacious engine rooms, multiple engines, or boats with complex systems and generators, such as sport fishing boats or larger yachts.
• Twin Pack Offering: For boats over 14ft wide or with very large engine spaces, we offer twin packs of heaters discounted for this need.

Each model is engineered to provide reliable protection for a range of boat sizes, ensuring that no matter what boat you own, you can have peace of mind that your engine and other critical components are safe from freezing temperatures. Some boats may require multiple heaters, and boats on a lift or trailer should go up one size from the recommendations due to increased heat loss.

Xtreme Heaters: The Best, One-of-a-Kind Bilge Heaters on the Market

When it comes to protecting your boat during cold weather, no other bilge heater on the market compares to Xtreme Heaters. From our first heater built twenty years ago, engineered with the latest technology and built to withstand the harshest marine environments, Xtreme Heaters continues to refine and raise the bar for reliability, safety, and performance. Here’s why Xtreme Heaters are the best choice for your boat:

1. Superior Design for Marine Environment
   Xtreme Heaters are engineered to thrive in the harshest marine conditions. Every component, designed exclusively by Xtreme, is built to withstand the rigors of boat engine compartments. These heaters are fully corrosion-resistant and specifically designed to handle extreme humidity, saltwater exposure, gas, oil, dust, and the constant vibrations found in marine environments. From the tough outer casing to the high-performance internal parts, Xtreme Heaters are built for uncompromising durability and reliability. We don’t just meet marine industry standards-we exceed them. Each heater undergoes rigorous testing to ensure it performs in even the roughest conditions, proving time and again that Xtreme Heaters are built to last.
2. Automatic Thermostat Control
   The built-in automatic thermostat is one of the key features that sets Xtreme Heaters apart. It activates the heater when the temperature drops to 40°F and shuts it off once the temperature reaches 55°F, ensuring that your engine compartment stays within a safe range to prevent freezing without wasting energy. This smart control ensures that your boat is always protected, even when you’re not around.
3. Safety Features that Go Beyond the Standard
   Xtreme Heaters are equipped with numerous safety features to ensure peace of mind. Each heater is ignition-protected, meeting strict marine safety standards including US Coast Guard standards for use in engine spaces. Our heaters have passed rigorous military spec testing for vibration, as well as extreme high and low temperature conditions. We go to great lengths to test and validate our products, ensuring that Xtreme Heaters deliver the highest grade of equipment available. No other heater on the market has been more extensively tested or has the proven 20-year track record that Xtreme Heaters do.
4. Energy-Efficient Performance
   Energy efficiency is designed into Xtreme Heaters. The automatic thermostat ensures that the heater only operates when necessary, conserving energy and reducing power consumption. Our heaters use PTC (Positive Temperature Coefficient) heating elements, which are the most energy-efficient source for heating due to their self-regulating properties. What does this mean for you, the consumer? It means that as our custom element warms up it tapers down its energy use while continuing to do its job, using less energy while still performing. This translates into cost savings for you over time, as the heater automatically adjusts its energy usage to meet the needs of your boat’s engine compartment. Additionally, the PTC element allows us to set a preset temperature range so that the heater never exceeds a safe temperature for use in areas with explosive fumes (250°C), making it extremely safe to use around the potential gas fumes in and engine space.
5. Advanced Electronics Designed for Military and Medical-Grade Performance
   Xtreme Heaters’ electronics are engineered to the highest standards, meeting military and medical-grade quality. These electronics feature a built-in timer to run the fan and reset the heater to ambient temperatures, ensuring optimal functionality. A tri-colored LED indicator allows you to know the heater’s status at a glance:
   • Green: Standby mode, ready to work.
   • Orange: Cool-down mode.
   • Red: Heating mode.

   With these visual cues, you will always know what your heater is doing. The advanced electronics also include surge protection and a fail-safe fuse for added safety. You can rest easy knowing that if the power ever goes off and comes back on, the heater will automatically reset and get back to work without any manual intervention.

6. True Forced Air Heating for Maximum Effectiveness
   One of the standout features of Xtreme Heaters is the true forced air heating system, which circulates heat evenly throughout the engine room. This ensures that all critical components are protected, not just those closest to the heater. Forced air heating is the most efficient way to distribute warmth, and we use a custom specked, waterproof 58 CFM fan with high back pressure rating to ensure consistent airflow across the heating elements. The fan is IP68-rated, meaning it is fully protected against dust and can withstand continuous immersion in water without harmful effects, ensuring long-lasting performance even in harsh marine environments. Additionally, the heater can be mounted in any orientation-upside down, vertically, or horizontally-providing maximum flexibility for installation, no matter the size or layout of your engine room.
7. Anodized Case and Sealed Heating Elements for Corrosion Protection
   To withstand the toughest marine environments, our heaters’ anodized aluminum case and sealed heating elements provide superior protection from corrosion, particularly in salty and humid conditions. These features also protect the heater from gas, oil, and other contaminants that may be present in the engine compartment. We have seen Xtreme Heaters in service for up to 20 years with no signs of corrosion or rust. Built to last the life of your boat, this rugged design ensures that your heater continues to perform for years, making it one of the most durable options on the market.
8. Compact, Powerful, and Easy to Install
   Xtreme Heaters pack a powerful punch despite their compact size, making them ideal for tight engine compartments in boats of all sizes-from smaller runabouts to large yachts with complex systems. With models ranging from 400W to 800W, they offer flexible options for various boat setups. Their compact design allows for multiple installation configurations, ensuring that space constraints are never an issue. Installing an Xtreme Heater is as straightforward as it gets. Whether you’re a DIY enthusiast or prefer professional installation, the included mounting hardware and simple design make the process quick and easy. With just a Phillips screwdriver, you can have your heater installed in a few steps. Simply plug it in, and it’s fully automatic-ready to protect your boat. For a more permanent solution, the heater can also be hard-wired into your boat’s fuse panel by a local expert. The power cord is rated for use on a boat and cutting the plug off to wire it in will not void your warranty.
9. Proven Performance in Harsh Conditions
   Xtreme Heaters have been tested and proven to perform in extreme conditions, from freezing cold winters to high-humidity environments. Our heaters are trusted by customers around the world to protect their valuable equipment, and their rugged reliability has made Xtreme Heaters the go-to choice for freeze protection.
10. One-of-a-Kind Protection for Your Boat
    There’s nothing like Xtreme Heaters on the market today. Combining superior design, advanced safety features, and reliable performance, Xtreme Heaters provide unparalleled protection for your boat’s critical systems. Whether your boat is in the water or on a lift, Xtreme Heaters keep your engine, batteries, and other essential components safe from freezing damage.
11. Strongest Warranty on the Market
    At Xtreme Heaters, we stand behind the quality of our products with the strongest warranty in the industry. Every Xtreme Heater comes with a 5-year warranty, demonstrating our commitment to top-tier craftsmanship and durability. On top of that, we offer a lifetime service guarantee-we’ll service your heater for life, ensuring it continues to perform at its best. With Xtreme Heaters, you’re not just buying a product, you’re making a long-term investment backed by a company with 20-year history of dedicated customer support.

Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) Features:

• IP68 Rated Heater
• Tested to U.S. Coast Ignition Protected standards
• Mil Spec tested (Military) for Vibration, Humidity, and High/Low temperatures
• True Forced Air Heating circulates air more effectively and heats more evenly for more accurate climate control.
• Automatic Thermostat turns the heater on at 40°F and off at 55°F +/-3° – the tightest tolerance available.
• Failsafe Design cannot overheat. Heating technology is dynamic and self-regulating.
• High-Efficiency Xtreme produces heat faster, circulates more air, and shuts off earlier.
• Pre-wired 15ft marine-rated power cord with 110V 3-prong plug eases installation.
• Maximum Life – Designed for durability and reliability.
• Complete Protection: Fully anodized inside and out.
• Small Footprint
• Certified and Independently Tested
• All Xtreme Heaters come with a 5-year warranty

Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) Specifications:

• Wattage: 400W
• BTU: 1365
• Inrush (startup) current: 8.2A, 1 sec.
• Typical operating current: 3.6A
• Fan flow 58CFM
• IP68 (Waterproof) rated Fan
• MTBF for fan: 40,000
• Heater Dimensions: 5.75″ x 3.5″ x 5 1/8″
• Box packaged Dimensions 10″ x 6″ x 6″
• Fuse or breaker size required 15A
• 15ft marine rated power cord
• UPC-895670001217
• Weight 4.0lbs

01 How long can I leave the Xtreme Heater in my boat unmonitored?

Your Xtreme Heater is designed for unattended, fully automatic operation. That said, it is always a good idea to check on your boat periodically. If you have suffered a power loss on your dock, you may want to check to make sure no circuit breakers have been tripped with restoration of power. You should test your Xtreme Heater annually, but otherwise your heater is maintenance free.

02 Can I mount my heater upside-down, to the hatch on my motor compartment?

Any of the heaters we have available can be mounted at ANY angle (upside down, sideways, etc.). The forced-air design of Xtreme Heaters makes them effective at any mounting angle, and allow you to direct the circulation toward areas of concern.

03 Is it ok to set my heater on the floor and not put in the screws?

Some of our customers take the heaters in and out of their boats. If you wish to do so, we suggest you use our quick-disconnect mounting bracket to secure your heater. If you choose to set your heater in the bilge without securing it, please make sure it won’t fall into any collected water or moving parts of the motor.

04 What happens during power outages?

Your Xtreme Heater will not operate during power outages. Short power outages should not affect your boat as it takes a bit of time for the warm components to chill down to freezing temperatures. Your Xtreme Heater will simply resume operation when power is restored. If the power is expected to remain out for an extended period, you should be prepared to winterize your boat in traditional fashion, according to the manufacturer’s instructions.

05 How does it get power and what power source do I use?

The heater runs on normal 115V power. The 20 foot power cord with 3-prong plug easily reaches from the heater’s mounting point to a circuit protected outlet inside cabin. Note that installation of a 115v outlet in the engine compartment of a gasoline powered boat is not recommended, as the outlets do not meet ABYC or Coast Guard standards for ignition protection.

06 Can I also put an Xtreme Heater in the cabin for extra protection? Would it be safe?

Certainly! Many of our customers use additional heaters in their cabin spaces to protect water lines, heads, etc. Realize that the volume of your cabin is much greater than the engine spaces of the boat, so size your heater(s) accordingly. If you are using multiple Xtreme Heaters, be sure that you are not running too much amperage through a single electrical circuit on the boat. It is always a good idea to plug your heaters into outlets on separate circuit breakers to prevent overloading a single circuit.

07 Non-US Power. Can the Xtreme Heaters be supplied with International Power? Which countries do you support?

Xtreme Heaters are available in 220v, 50hz for international applications. Our 220v heaters are provided with a power cord that is not terminated. The appropriate plug for your geography will need to be purchased separately.

08 Is it DC power (connects to battery) or AC (plugs into power outlet)?

All Xtreme Heaters are AC (household powered) devices.

09 If my boat is on a lift, how do I determine which size Xtreme Heater is right for me?

Generally speaking, you should select a larger Xtreme Heater for boats stored on lifts. In most areas, the water does not reach freezing temperatures, which helps protect the boat. With the boat lifted out of the water, that benefit is lost and your boat will acclimate to the ambient air temperature. Also, with your boat on a lift, the exhaust exit is exposed to the elements, and wind could drive cold air into the engine compartment

10 At what temperature range should my compartment be when I use the heater?

There are a lot of variables that will affect your specific situation, such as the local climate conditions, where the boat is stored, whether or not your, and where you are measuring temperature, just to name a few. Your Xtreme Heater is designed to turn on at 40°F and off at 55°F, which should keep your engine compartment comfortably above freezing. If you notice temperature drops below 35°F, you should check to see if you are losing heat through vents or other air passageways. If you find that your boat’s engine compartment is well sealed from air loss, you should consider a larger or additional Xtreme Heater.

11 How long does it take to get hot?

Our heaters should blow warm air within 30 seconds of turning on. The exit temperature of the air is warm enough to feel with your hand, but not hot enough to burn skin or nearby materials in the engine compartment.

12 At what temperature should my heater turn on?

The thermostat is set at 43°F from the factory and has a +/- 3 degree tolerance, which means it so it will turn on between 43 and 46 automatically.

13 How can I tell if it is on?

If you purchased your heater after 2009, when your heater is plugged in to a live circuit and receiving power, the power LED on the rear of the heater should be lit. Heaters manufactured prior to 2009, included an LED that lights when the heater is actually generating heat. These heaters can be tested with freeze spray to ensure they are operating properly.

14 I placed heater in the freezer or outside to test it and it is not turning on. Why?

The Heater must be left in a stable environment for 30 to 45 minutes before it will come on. It can take this long for the metal to cool from room temperature, to the ambient temperature of your freezer, or cold outside environment.

15 The light does not turn on when I plug it in, what’s wrong?

You may have an earlier version of the Xtreme Heater, in which case the LED will light when the heater is activated, generating heat. Use freeze spray to test your heater for proper operation. Alternatively, the outlet you have plugged the heater into is not active. Try plugging in another electrical appliance, and check the circuit breakers on the boat and dock to make sure there is power to the outlet.

16 Is there an on/off switch?

There is no on/off switch on your Xtreme Heater. The heater operates automatically when plugged in.

17 What is the best position within the bilge compartment to install the heater (low, high?)

The best location for your heater is going to be based on your specific boat and engine room configuration. Since heat rises, it is best to get the heater, and airflow to start out as low as possible in the bilge. Air will circulate throughout the engine space, but it is best to direct the airflow of the heater toward the equipment you wish to protect. Do not install the heater where it may become submerged before bilge pumps evacuate any standing water that accumulates in the bilge. Remember, even boats on lifts or trailers can collect water from rain/snow events

18 What is the maximum current requirement of this unit, during startup, and during its maximum heat producing mode?

View our Current Requirements

19 How long will the heaters last?

Your Xtreme heater is built to last the lifetime of the boat.

20 How hot does the outside of the heater get when it’s running? (concerned about what’s around it)

Your Xtreme Heater is designed to move heat through forced air rather than radiate it from the case. The case should never feel hot to the touch and will not get hot enough to affect surrounding equipment. The more important point here is that you want the air from the heater to freely circulate in the engine compartment. It is for this reason that we suggest clearance from other items in the bilge.

21 How do I install the heater with the quick release bracket?

The quick release bracket is permanently installed on your boat with screws. Your Xtreme Heater slides into the rear of the bracket, and is secured by the quick release on the front of the bracket. No tools are required to mount/remove your heater from the quick release bracket, once installed. View our Installation Manual for further details.

22 How big is the heater?

Heater dimensions are 6″ x 4″ x 5 1/8″ (L x W x H) for the small model, and 8″ x 4″ x 5 1/8″ for our medium and large size heaters.

23 Can the Xtreme Heater plug into a regular wall socket at my house?

Our heaters will plug into any standard 3-prong outlet. Do not use “adapters” with your heater to plug it into two-prong outlets that may not be properly grounded.

24 Do the heaters go through any kind of cool down cycle when the heat shuts off where the fan will stay running for a couple minutes?

Xtreme Heaters do include a delay that will keep the fan running for about 10 minutes after the element has turned off. This is not a “cool down” cycle, per se, as our heating technology doesn’t require one, rather it’s an aid to efficiency, drawing the remaining heat in the element off and into the engine spaces rather than have it wasted by dissipating in the case. This cycle also helps the heater return to ambient temperature more quickly for more consistent temperature control.

25 Can you hard wire the heater into the shore power circuitry?

Many of our customers have their heater permanently installed, and wired into the boat’s breaker panel. If you are not familiar with wiring and electricity, we strongly encourage you to consult a professional to complete the job.

26 Does the heater keep people warm or just equipment?

Xtreme Heaters are designed to efficiently prevent freezing in the engine compartment. As such, they are designed to shut off at 55°F.

27 Do you have a heater that will work for an outboard engine?

Unfortunately, there is little space under the cowl of modern outboards to allow for a heater to be installed. The good news is that most outboard engines are self-draining and don’t require freeze protection. Be sure to check your owners manual to see what steps you should take to prepare your outboard motor for a freeze. We do have customers with outboard powered boats, that use our heaters to protect bait tank plumbing, heads, sinks, etc.

28 Can I use an extension cord or power strip for the heater?

Extension cords and power strips are not recommended for use with your heater. Power strips are not ignition protected, nor moisture resistant, and should never be placed in the engine compartment. Improperly sized extension cords can cause voltage drop to occur, and could even present a fire hazard. If you must use an extension cord, make sure it is heavy-duty to handle the electrical load of the heater, and rated for the environment you intend to use it (i.e. outdoor, wet conditions). Extension cords should not be used in the engine space unless also rated for fuel/oil resistance and 105°C temperatures, as ABYC standards dictate.

29 Is there a way I can adjust its thermostat?

The thermostat on your Xtreme Heater is fixed, sealed, and cannot be adjusted.

30 How do I test to see if my heater is working?

The thermostat, a round disk about ½” across, is located on the air inlet side of the heater. If you direct a blast of freeze spray toward the thermostat for 4 seconds, the heater will activate.

31 How do I install my heater?

Four mounting screws are included with your heater. If you wish to be able to easily remove your heater during boating season, consider our quick-release mount. Whether mounting your heater permanently, or with our quick-release mount, be sure to choose a mounting location that is above any potential areas of standing water in the bilge. For boats with a stern drive we would like to see the heater mounted towards the back of the compartment blowing to the out drive and the back of the motor. For boats with V Drives, air should be directed toward the transmission/rear of engine. On inboard powered boats, direct the airflow toward the rear of the motor and transmission.

32 What should I do with my old BoatSafe heater?

We have found a number of uses for old BoatSafe Heaters: Target PracticePlanter – Using a drill, remove the rivets holding the top cover over the resistive heating element. Invert the cover, and fill with soil. The “5×5” vents offer terrific drainage.Wheel Chocks (safe for small, light vehicles only)

About Xtreme Heaters:

Xtreme Heaters was founded in 2004 with a mission to make the best freeze protection device available. From the small niche market that we originally created the product for (boating), our heaters soon found homes in RVs, campers, well houses, outdoor valve enclosures, greenhouses, utility trucks, compressor enclosures, cars, mining and construction equipment and even military vehicles and ships. There is simply no better freeze protection product on the market that is as refined, heavily tested, and validated through customer experience.

As we celebrate 20 years in business, we remain committed to our core values of safety, reliability, efficiency, and personalized customer service, which is now backed by the best warranty in the industry of 5 years repair or replacement with lifetime support and service. The only thing that rivals our commitment to provide the best products is our commitment to our loyal customers, for which we are grateful.

Xtreme Heaters started as a simple idea born from a love of the water and family time. After finally buying our first big boat, we spent every weekend we could at the lake, enjoying the freedom and peace it brought us. It was during one Thanksgiving break that the vision took shape. We were out on the lake in those crisp fall mornings, bundled up, sipping coffee, watching the sunrise, and soaking in the quiet sounds of ducks and waves in the background. It felt like the perfect escape in an otherwise busy world.

But reality hit each time we had to winterize and de-winterize the boat just to get a few spontaneous trips in through the season. We did it three times that year alone—it was exhausting, impractical, and took the fun right out of it. After trying everything from unsafe personal heaters to DIY setups, it became clear that there had to be a safer, simpler way to keep the boat ready for those special moments, without the hassle. That’s when the idea for Xtreme Heaters took root.

Working at an electronics design firm, I dove headfirst into creating a heater that could keep the boat safe in the cold without needing constant attention. It sounded simple enough, but that first spark of an idea quickly turned into a long journey of late nights, prototypes, and a lot of trial and error. For over two years, I spent freezing nights out on the dock, braving the cold temperatures with temperature probes spread all over the boat, trying to get everything just right.

Some of the discoveries were surprising, like how temperatures could vary by as much as 20 degrees within the same engine room, all because of subtle differences in airflow and leaks from fresh air vents. Every time I thought he’d nailed it, a new challenge would pop up, leading to yet another tweak in the design. After six different versions and countless hours testing out in the cold, I finally had a heater I could trust to keep my boat safe through the winter. Those early nights on the dock taught me more than I expected, and that hands-on knowledge still drives Xtreme Heaters to build the best, most reliable products today.

Every bit of knowledge from those cold, late nights has helped us build the best freeze protection solution possible. For over 20 years, we’ve taken customer feedback seriously, using it to continually improve our products. When someone suggested it would be helpful to know when the heater was on, we added an LED indicator. Then we went a step further, making the LED show what the heater was actively doing. We’re problem-solvers by nature, and every piece of customer input is another chance to make our products even better. We upgrade components whenever we find a weakness, and as new technology emerges, we incorporate it to ensure our heaters are always cutting-edge.

Our goal is to create a product that’s as bulletproof as possible. We don’t just test to meet the required standards; we go well beyond them to find the breaking point, and we haven’t found it yet. Xtreme Heaters is a family-owned and operated American company, and we’re proud to still be as passionate about our work as we were when we started. We’re boaters and outdoor enthusiasts designing products to meet niche needs because we love what we do. At the end of the day, our customers are our top priority. We’re here to help, to solve problems, and to make sure you get the most out of your time on the water, on the road, or wherever your adventures take you.

At Xtreme Heaters, our mission is to build the safest, most reliable, and efficient freeze protection on the market. Our heaters are designed to give you peace of mind by keeping your engines and equipment safe from freeze damage, so you can enjoy more time on the water, at work, or on the road. Whether you’re a boat owner, RV enthusiast, or rely on our products for industrial or military use, Xtreme Heaters is the trusted choice. With two decades of proven performance, we’ve earned our reputation for delivering dependable, high-quality protection that keeps your equipment running smoothly. Simply put, our heaters are the best solution for anyone looking to extend their season and avoid costly repairs.

When harsh weather hits, we’ve got your back with dependable solutions that give you true peace of mind. But we don’t stop there—we’re always working to enhance and broaden our product lineup to better serve your evolving needs, whether you’re in current markets or new ones. We believe in exceeding your expectations and building trust that lasts for the long haul. Your comfort and confidence in choosing us mean everything. That’s why our products come with rock-solid warranties—because we stand behind their quality and durability. And when you need assistance, our friendly customer service support team is here for you every step of the way. Ensuring your complete satisfaction is the goal, and we won’t stop until it’s achieved. Xtreme Heaters is built to be the best.

Xtreme Heaters 400W IP68 Engine Compartment Heater (XHEAT-400) Documents:

Xtreme Heaters 400W IP68 Engine Compartment Heater Owner’s Manual