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Posted by Scott Ruffner on January 22, 2004 at 12:25:58:
In Reply to: Re: National Gas Co. Boiler - not very hot supply temp. posted by Harold hydronicnetwork.net on January 21, 2004 at 15:33:21:
: You probably have had the house upgraded with more insulation, so there is less heat needed than originally. This would also mean that you don't need much water temperature to heat the house as the radiators are longer than necessary.
I haven't added insulation, although at some point in the house's life somebody did. They also put on storm windows and doors.
: If the thermostat and controls are wired correctly, it is the thermostat that starts the burner and circulator and shuts them both off, so the thermostat is sensing the warmth of the room and only making the water temperature as hot as needed.
Yes, that is the way it is operating...and why I said I _think_ everything is working "properly".
: This is not a good situation for the boiler, because running an old boiler below 140F often makes the boiler sweat and corrode from the condensing water - as well as the chimney.
Yeah, this worried me, and the fact that the outer rooms never get very warm. I'm going to do as you suggest and wrap the fins in aluminum foil to cut back on the radiation in the room with the thermostat. Based on your other comments on this forum, I figured that might be the answer. I really appreciate your answer - I was hoping you'd respond.
When the warm weather comes, can I add ball valves on the lines going to those radiators and control the water flow through just those units that way? It's a single pipe system - although it branches into two separate loops at the far end of the house from the furnace, and then comes back together right above the circulating pump, before entering the boiler.
Scott