Winterize an outboard, I/O or inboard on the trailer.
Xtreme Bilge heaters Suitable for most boats up to 24′ Length single engine.

The Xtreme 400w small Bilge Heaters are 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 400W Xtreme Heater 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.

• True Forced Air Heating circulates air more effectively and heats more evenly for more accurate temperature control.
• Mounting orientation flexibility: Horizontal or vertical installation supported, even upside down.
• Automatic Thermostat turns the heater on at 40°F and off at 55°F (+/- 3°F) for tight, reliable control.
• Failsafe Design cannot overheat; the heating technology is dynamic and self-regulating.
• High Efficiency produces heat faster, circulates more air, and shuts off earlier to save energy.
• Pre-wired 15 ft marine-rated power cord with a 110V 3-prong plug for plug-and-play installation. No hardwiring required.
• Maximum Life: Designed for durability and reliability in harsh environments.
• Corrosion protection: Fully anodized inside and out to resist corrosion in wet and salt-air conditions.
• Mounting hardware included: Stainless Phillips head screws.
• Energy note: thermostatically controlled can reduce energy use up to 75% compared to continuous-run heaters.
• Certified and independently tested.
• IP68 rated: The assembly is sealed for rugged use—resists dust and moisture exposure in dirty, damp conditions and handles wet, harsh environments without failing.
• Ignition protected: Tested to U.S. Coast Guard standards (USCG 33 CFR 183.410) and SAE J1171.
• Mil-Spec tested: MIL-STD-810E Method 514.4 for vibration, humidity, and high/low temperatures.
• 5-year warranty (best in the business), backed by U.S.-based support.
• Built for freeze protection in compartments, enclosures, Marine engine compartments, and utility bays.

As product and industry experts, our goal for the Xtreme 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 consider increasing the wattage of the heater up one level 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.