lsayre wrote:OK, then your drawing (about 11 posts above) represents only half of your system, correct? What does the other half look like?
As of now I have a 1.25" copper loop running across the basement where it splits into two 1" loops the left loop runs to a radiator in the basement and then to 3 bedrooms and the bathroom then returns to the boiler. The right loop into a crawl space under the living room and small dinning room then returns to the boiler, all rooms have fin-tube baseboards. There is no heat in the kitchen as the house is very open.
The back room is a mostly glass spa room 28' by 38' with a swim tank and a hot tub. It is 3/4 copper pipe with fin-tube baseboards all around outside walls. It is not heated as of now, as I closed it off when I went to an electric boiler. I want to make the basement and bed rooms zone 1, the living room and dinning room zone 2, the bathroom zone 3. I will add zones to the spa room later. I was thinking I could make the radiator in the basement the dump zone.
Sorry that the diagram is so bad I will try to make it easer to understand