How Many Amps Does 400W Xtreme RV Boat Heater Draw From 12V Battery Bank?
Updated 10/16/2025 | Published 09/30/2025
Question:
I’m worried about power draw. How many amps does this 400W unit actually use?
asked by: Linda
Expert Reply:
Good question, Linda. The Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket 400 Watts # XH67FR pulls about 5.2 amps when running, with a brief startup inrush around 8 amps for a second or two. That’s well within what a 15A RV or dockside breaker can handle. Just avoid running it on the same circuit as heavy-draw items like space heaters or microwaves.
Do you plan to run it off shore power only, or are you considering a generator backup?
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Xtreme Heaters RV Basement and Boat Bilge Heater with Quick-Release Bracket - Small - 400 Watts
- RV Heaters
- Electric Heater
- 110 Volts
- Winterization
- 5th Wheel
- Motorhome
- Travel Trailer
- Xtreme Heaters
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Linda
10/16/2025
That helps, thanks! I was just wondering: could I hook this to my inverter temporarily if I lose shore power overnight, or would that drain my batteries too fast?