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Posted by HeatPro on December 02, 2007 at 17:10:03:
In Reply to: Re: Convector and recessed radiator EDR calc posted by steve on December 02, 2007 at 17:03:23:
: Will a normal hot water boiler have a sufficient payback to cover the cost of converting from steam?
++ What's 'normal'? You'd change when the old steam boiler died. Then it would be worth it over the next decades.
: How can you run the water at the same temperature as the steam?
++ Set the high limit to 225F. Steam or water inside a radiator at 215F provides the same heat output.
: If the heat loss is later lowered what happens? I just run the big boiler at a lower temperature?
++ Yes.
I guess this adds some savings, but not as much as a smaller boiler from the outset.
++ When the new boiler is a water boiler it will be smaller right away as you'd size for the actual heat loss instead of total steam radiation plus 50%.