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How to use alt heat on nest thermostat. In case your heat pump isn't working correctly, you can select to always use alt heat. This video introduces 2 method to force alt heat to turn on. The nest has the advantage of knowing the weather forecast and not just the temperature, so it can make the system run a little bit more efficiently by kicking auxiliary heat on itself.
Turn off the power source. For a gas water heater, turn off the valve on the side of the unit by turning it to the "off" position. In the case of an electric water heater, turn off the power supply at the circuit breaker. Turn off the water supply. There should be a valve on the inlet water pipe that supplies cold water to the heater. There are a few ways to tell if your system has emergency heat: Your current thermostat has a switch or a button labeled "emergency. " your current thermostat has a connector labeled e, and there's a wire in it. Your heat pump's manual or manufacturer says your model has it. Contact a local pro.