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Re: Convector and recessed radiator EDR calc

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Posted by HeatPro on December 02, 2007 at 16:03:53:

In Reply to: Re: Convector and recessed radiator EDR calc posted by steve on December 02, 2007 at 15:24:39:

: So to go to condensing from steam I would either need half the heat I currently have or larger radiators.
++ You are of course, pulling my leg.
The heat you need now is what you'd need after; unless you insulated the house.
If you have enough radiators for now; you'd provide water at the same temperature as steam so no change in radiators would be needed.
You wouldn't use a condensing boiler unless you cut the heat loss by insulating.

: Without insulation (just stucco and plaster) and new windows (I have storms), what sort of typical payback period do you see on hot water and condensing hot water? Do you have any idea as to the ballpark cost (at least the order of magnitude)? The house is ~3100 sf, 13 radiators, and 6 convectors.
+++ Your result would be according to the improvement of AFUE. Savings would be from the improved efficiency of the heater. Further savings would be from decreased heat loss due to insulation.

: If you run both pex through he current pipes won't the return water cool the hot water or is insignificant?
++ Contact between the two tubes would give an insignificant effect.
Generally, how large does the single pipe have to be for this to work?
++There is no generally in charge. This is a look-see problem and the water flow need for the room heat loss that determines the tube sizes.

Can such a system be zoned?
Yes, that is the charm of a hot water system over a one-pipe system.
: What type of boiler is used? Stainless?
++Stainless, copper or aluminum.

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