This system wouldnt be the only source of heat just
an augmentation to *to decrease his power bill hopefully. I think he
would be happy if it just heats his "great room". It is beginning to
sound like this is going to be a separate system that just heats the
main part of the house.

Jimmie

thats the way to go, seperate system to just heat one room.

the question is how much will that room need heat when the solar
collector has excess heat to supply?