Oversized boiler solution (radiant heat)?
Hello everyone (once again),
I am in the early stages of planning a home conversion from radiator heat to in-floor radiant heat. I have the entire system planned out already- with one big exception- the boiler.
I have a large, 140,000 BTU/hr boiler that's from the mid 90's. Hy home's heat loss calculation is about 40-50,000 BTU/Hr, so the boiler is considerably oversized. My heating bills in the winter time are pretty ridiculous currently ($200-300, and I like it cold; St. Louis, 2000 sq.ft.). I want to keep the same boiler since a new one would be prohibitively expensive. I have noticed that the original boiler installation is shabby at best- there is 1" black pipe that runs to the boiler, and then there is a reducer to 1/2" to feed the boiler. Also, none of the pipe is supported against the wall or joists (!).
Anyway, I thought of the following as a potential way to save some money. Could I underfeed the boiler by replacing the 1" pipe with 1/2" pipe, thereby starving the boiler and prohibiting crazy gas use? Or would the boier be so inefficient that it would end up costing more? I know I will save with the in-floor heat, especially when I replace the HUGE 3" pipes running to the radiators, but I can't afford too want winters like this.