I recently had my basement finished and there were three hot water radiators installed and hooked up to the existing boiler that heats the radiators upstairs. Unfortunately, it's still 4 to 5 degrees cooler in the basement than upstairs. This may or may not be due to the fact that the radiators downstairs are not big enough. I think that the radiators could in fact heat the downstairs if the boiler was on long enough. I was wondering if there is a way to have two thermostats hooked up to the boiler along with a valve that would put the boiler and radiators in one of the following 4 situations:
- Boiler on - downstairs and upstairs radiators receiving heat
- Boiler on - downtairs radiator receiving heat, upstairs radiators not receiving heat
- Boiler on - downstairs radiators not receiving heat, upstairs radiators receiving heat
- Boiler off
I believe this would be called zoning. Is this possible?