OK, experts here's one for ya...........

I want to go boating in or near the Great Lakes and I'd like to stretch
the season. Am considering about a 22ft cabin cruiser but I want some
heat in the cabin while underway.

What kind of heater or furnace is available and/or practical? The
power is an outboard so I know that electrical heating is not an
option, do some of the sail boats use alcohol or kerosene or diesel
fuel to heat their cabins?

Propane or LNG, or what????????

Thanks in advance?