THERELMAX offers a cost effective, energy efficient solution that improves battery performance and increases the resale value of your boat. You won’t have to worry about freezing damage with our signature boat engine heater. The boat engine compartment heater keeps the bilges warm and dry, so you’ll have a boat that still works like new.
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A THERELMAX marine engine block heater will also help you to significantly reduce your winterizing costs. When the batteries are protected, you can rest assured that your boat is ready to go. Whether you patrol the waters or just like taking your boat out on colder days, you’ll always be good to go with an engine compartment heater on board
| Model | Wattage | BTU | Current | Inrush (startup) Current | Voltage | Fan Flow | Noise | Power Cord |
| HMA500 | 500W | 1706 | 4.2A | 4.5A | 120V | 40CFM | 47dBA | 13Ft |
