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I run my P337H at about 12.5-13 GPH per motor (maybe a bit more for the rear), and see no change when I run the heater. I think (could be wrong!) the fuel that goes to the heater is unmetered, but its a fairly miniscule amount IMHO, at most .5 GPH. My buddy put an 8000BTU diesel heater on his sailboat last winter and it uses about 3 gallons per day. Heaters are pretty darn efficient.
Last edited by mshac : 05-17-23 at 07:10 PM.
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