We have a 103KBTU IN, induced draft (83% efficiency) gas boiler hooked up to a hot water baseboard heating system on one zone. Our hot water for the house is supplied by an on-demand gas system separate from the heating. The circulator is a 25 year old Grundfoss 1/25 HP on the return loop. We're retired now, and while the system is well maintained, and running well, I want to try and wring out as much efficiency as I can. Investing in a new High Efficiency boiler would not be a smart move, considering our ages, LOL! Anyway... the smart thermostat has an adjustment for how many "calls" per hour, which I dropped from five to three. It's a 2400 square foot, single floor house with decent insulation, but a bit of glass. I was thinking that there might be a setting in the aquastat that kept the circulator pump running longer, to get as much heat from the water in the boiler longer after the burner has shut off. Seems wasteful to just have all that hot water sitting in the boiler. The high shut down is set for 180 degrees. THe add-on circuit aquastat that goes on the return pipe is factory set to go "on" at 105 and shut down at 83 degrees. Do I have that right? Can something be done with the existing aquastat to get a longer circulator run? Right now it seems to shut down soon after the burner shuts off.
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