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Posted by HeatPro on April 30, 2008 at 13:33:42:
In Reply to: Re: W-M CGs vs GV vs Burnham Revolution vs SCG (Long post , many ?) posted by John Anderson on April 30, 2008 at 13:03:02:
Thanks for explaining your needs further.
Your existing boiler serves your needs in the colder weather. However, it is oversized for most of the year. Your greatest concern would be for lacking heat in the coldest weather, which your existing boiler serves well.
As you have no concerns with servicing the electronics of a more complex fan-assist boiler, that opens more possibilities. You can get the best of both situations by not 'having all your eggs in one basket." A garage or small room nearby would be able to hold a condensing sealed-combustion 91%+ AFUE boiler that can be piped in parallel to the existing boiler to provide the proper water temperature according to the weather. Most condensing boilers now modulate from about 40,000 to 220,000 btuh.
Mestek now has a condensing cast-iron rAy boiler that would have no exchanger weld failures as it is one-piece. Other condensing boilers by Burnham, Peerless, and others use the same stainless-steel exchanger with their own surrounds. Weil's Phd is their own design.
A modulating condensing boiler would bring your installation up to today's energy plans to be able to vary temperatures to only use full energy in the occupied rooms through zone valve control.