I thought i would run this by you before i spent any more time thinking about it.
The only heat my boat has now is an electric element in one of the ac systems. Great if plugged in, but I am trying to make the boat as free from shore power and gen power as I can.
I need more heat as I will be on the boat for much fot the winter.
So i am thinking the my long term solution is probalby the Wallas diesel fed, hot air system. I can use the existing AC ducts.
But in the short term, the other day, it was quite chilly and I was thinking of getting one of those little hot water heaters with small fan that I think trucks use sometimes. But my real idea was to plumb it into the hot water line that's right under the pilot house for the head. then I would only have to make a return line and i would just put a "T" into the intake to return hot/warm water.
On this little heater, I would have a valve to turn it on or off. When on, it would mean my water pump would be sending water thru.
I'd only use it to take the chill off the pilot house on chilly mornings and yes, only when engine is running (if not running, I won't be in pilot house)
What am i missing?? seems too easy??