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It definitely does not have a bypass. I cannot justify replacing a 7 year old boiler. I think you are exactly right, a condenser would be perfect, I will plan on that next time.

I appreciate the input. The windows are new (last decade) vinyl Pella's, so I would agree with you that I have quite the excess of radiation now, compared to when the house was built. I am asking for some quotes to install a bypass. When the main zones calls, it frequently is satisfied in <...

I just installed a Tekmar 256 yesterday and had a few question about my settings. My system: 93 year old home, likely a converted gravity-hot water system. Unknown when It was converted. Blown in insulation. 2 zones: 7 cast rads and a baseboard rad on main zone, fin tube convector in an...