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If you just shut off the gas without shutting off the electrical, it shouldn't damage the system. Basically the thermostat(s) will continue to call for heat, the boiler will try to fire up and fail, then the boiler should give up and enter lockout. The boiler has safeguards built in to handle a lack of gas, which should prevent damage to the system.


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First things first, you'll need a transformer to step power down from 120 volts to 24 volts. Next, you'll obviously need a zone valve. You'll also need a thermostat, to actually determine when the heat should come on. You'll need a thermostat and zone valve for each zone, but a transformer should be able to supply a few zones. Start by connecting one of ...



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