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What size breaker do I need to hard wire 800w Xtreme heater XH27FR for winterizing rv or boat?  

Published 09/30/2025

Question:

What breaker size do I need for the 800W XH27FR?

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Expert Reply:

Mike, the 800W heater # XH27FR draws about 6.8 amps running, with a 13.5A inrush on startup. Xtreme recommends a 20A breaker for this model. If you’re wiring it into your breaker panel, give it its own dedicated circuit to avoid overloads. You can definitely just plug it into an outlet as is though.

Are you planning to mount it permanently, or use the quick-release bracket for seasonal swaps?

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Andrew N

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