Is One 800W Xtreme Boat Engine Bay Heater Enough for a Twin-Engine Cruiser?
Published 10/28/2026
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Question:
I've got a 2005 Sea Ray 320 Sundancer with twin MerCruisers and a generator. We keep the boat in a slip through most of the winter and I'm trying to find a good engine compartment heater. Would one of the 800 watt units be enough to protect everything or should I install two?
asked by: Steve
Expert Reply:
Hey Steve!
For your Sea Ray 320 Sundancer, I'd go with the Xtreme Heaters 800W Boat Heater # XH668FR, which is designed for larger boats up to approximately 35'. We also have the 600W model # XH368FR for boats up to around 28' and the 400W model # XH298FR for smaller boats up to approximately 24'.
Since you have twin engines and a generator, you may benefit from two heaters or just grabbing the bigger heater depending on your engine compartment's layout. These use forced air to circulate warmth and automatically turn on around 40°F and shut off around 55°F. Just keep in mind you'll want reliable shore power to run the heater as it runs off 120v standard outlet.
How is your generator positioned relative to the engines?
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Xtreme Heaters Boat Bilge Heater - 800 Watts - 15' Cord
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- Electric Heater
- 110 Volts
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- Automatic Thermostat
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