Heater capabilities

toolmaker312

What is the coldest outside temperature that the heater will comfortably heat the cabin ?
Trying to extend my season. Thanks

Spyderweb

We’ve had overnight lows in the mid 40’s.  Heater had no problem keeping us comfortable.

Aqua_Aura

Doesn't it also depend on the water temperature since that's what is cycling thru the compressor? 

Dream_Inn

I've used mine in early March when water temperature was upper 30s and the air temp dropped in the mid 20s over night.  While you are on the boat, you could also use safe electric one (but only if you are there monitoring it).

LaRea

The Passport manual says it will heat when the water temp is at least 40*F.