Why does boiler kick on in summer heat? - Fin
2005-7-24 · I have a gas boiler, and it keeps the water in the boiler at a certain temp, regardless of calls for heat from the thermostat (which kicks the circulator pump on.) I just turn off the gas valve when summer comes. In fall, I clean out the boiler burners and give it all a general cleaning, then turn the gas back on and light the pilot.