Hi all, I have a Peerless Boiler, that was for a 2 unit Building, but now I have removed the Radiators in the second floor. So its only heating up one 1300 SQ FT APT. (5 rads) Here is the issue - the pressure goes to the max on the reading gauge when it heats up. I think 90PSI. Here is what I tried : 1. Drain entire system. and with boiler off, allow water to fill it. Read the pressue - 11-14 PSI. Inlet water supply still open. 2. Start boiler, as it heats up, the PSI Flies up. Max 90PSI, it usually gets to this. Inlet water still open. 3. When the PSI was that High, I let air out of the Expansion tank, its inline and about 1.5ft tall grey tank. Water filled the tank and pressure went down. 4. As boiler got hot again, pressure went back up to 90PSI. Expansion tank is now full of water. Heat is set to 180F ( lowest setting) on the boiler. What can be the issue ? Here is what I think might not be : Inlet valve ( bell shaped valve by bell and gosset) - it fills to 11-13PSI only.... Do I need to replace the expansion tank? Dont know what to do.

can anyone give me an idea of what a burnham v8 series boiler would cost? I also need this to heat domestic water and was looking for an indirect hot water tank b/c i heard it was more efficient than the domestic hot-water coil/tankess combo. do i have my facts straight on that and what could i expect to pay? i got what seems like a very high estimate from my fuel oil service company for a new boiler set up, esp since it seems like the indirect tank should run no more than 1,000 and a burner only a couple hunderd. i wonder if the boiler could be as expensive as the estimate they gave. thanks