We have a Mr. Heater on Tropical Dance. The heater has 2 hanger holes on the back. We put a couple of screws in a cabinet near the companionway slide for ventilation and warm the boat up in the morning.

We've been in the Caribbean for 3 years now and the Mr. Heater is still aboard just in case. Why anyone would install an expensive heater that is needed very seldom is beyond me.