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Most high efficiency gas furnaces use an electric ignition system and cycle on/off based on thermostat input. It does seem like they should have a battery backu
by throwawaysea 5y ago
Most high efficiency gas furnaces use an electric ignition system and cycle on/off based on thermostat input. It does seem like they should have a battery backup or a way to manually ignite it in an emergency, but most don’t as far as I know. However if they’re just on already and continuously running rather than cycling, then they don’t need electricity. These furnaces are also typically coupled with a fan (a blower) to force the air through ducting and take air back through a return vent. Those also tend to be electric.
- djrogers 5y agoGas furnaces can heat water or oil for radiators too, which requires no fan.
- mbreese 5y agoWater radiators often have a pump attached to force the hot water to move more than with a gravity system. A couple years ago, the pump on our radiator boiler went out. Only half of my house ended up with heat without it.