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adding outdoor thermostat to control boiler second stage
I have a two stage 300,000 btu boiler (NG) that has a high fire gas valve as well as the regular gas valve. The thermostat on our operating temp is set at a boiler inlet temp of about 170. The high fire valve also has an adjustable thermostat, which in the winter is set at about 145-150. So when the water temp at the boiler inlet is below 140-150, the high fire gas valve opens, and all 300K btu's are used. Currently, I have the high fire valve turned off. I only turn it on Dec-Feb. We live in northern CT. Is there any simple outdoor thermostat that I can wire into the high fire gas valve circuit that will allow it only to function when the outdoor temp is below 20 degrees? The boiler never has a problem with inlet water temps being too low. So I only need to run that high fire valve on the coldest days when all three hydroair zones are running as well as DHW. Thanks.
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