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Posted by Harold hydronicnetwork.net on January 21, 2004 at 15:33:21:
In Reply to: National Gas Co. Boiler - not very hot supply temp. posted by Scott Ruffner on January 21, 2004 at 14:43:48:
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.
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.
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.
This is a correctable situation. Laying aluminum foil over the fins of the radiation near the thermostat and in the other rooms to balance the heat and bring the water temperature to at least 150F would be prudent. It seems you have 4 times the radiation needed to do the job, so a lot of aluminum is probable.