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Posted by HeatPro on January 11, 2006 at 09:19:43:
In Reply to: Re: Over-sized boiler posted by Joe Brix on January 11, 2006 at 08:36:50:
Yes, Joe. That is a possibility now, even with right-sized boilers. A radiant slab takes a long time to heat the mass, so a cast-iron, large-mass boiler as small as needed for a small slab home could condense all the time. As a 2000-square-foot home only needs about 50,000 btuh with today's insulating standards, the right-sized 50,000 btuh IBR rating could be installed and still take forever to get up above the condensing temperature, if ever. Someone using the old 40-square or cube-5 estimating method would have great oversize problems. Care in applying loop-subloop configurations and/or mixing valves is an ever-present change for out times.