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Posted by Doug on July 15, 2007 at 16:21:00:
In Reply to: Re: circulators vs zone control flow posted by HeatPro on July 15, 2007 at 13:40:53:
It was part of the package when we bought the house. I've had a few discussions with "experts" regarding efficiencies of what is in place vs. a new system. No one suggested utilizing zone flow system which you’ve confirmed makes better sense.
As mentioned there are 6 zones, the heat output is 140K btu and loss is 145K btu. My quest to make sure I am running as efficiently as possible has brought up circulators and a few other issues.
What I’m trying to address is that at any given time 1 to 3 zones call for heat. Rarely are 4 zones or more calling. If that’s the case and I only need say 20-75K btu output is a 140K output always necessary?
The Valiant boiler (oil) is 15 years old and works just fine and is 86% efficient, I am told. Could I benefit greater from new technology boilers, which modulate between outputs A to 145K enough to justify the expense? I also have NG in the house as an option to switch over if that makes better sense.
I appreciate your input.