How to Drain a Heating System

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    Drain the System

    • 1). Turn off the gas supply for the burner or turn off the electric circuit to the unit from the circuit box.

    • 2). Close the inlet or water supply valve on the boiler. This will prevent any water from coming into the boiler while it is being drained.

    • 3). Wait between one to two hours for the water in the boiler to cool.

    • 4). Place a bucket under the drain valve for the boiler.

    • 5). Open the drain valve until the bucket is full and then close the drain valve.

    • 6). Dump the bucket of water and repeat the previous step.

    • 7). Stop draining water from the boiler when the water appears clear.

    Refill the Boiler

    • 1). Close the drain valve.

    • 2). Open the supply valve to begin filling the boiler.

    • 3). Turn on the gas supply or turn on the circuit for the boiler on the circuit box.

    • 4). Wait for the boiler to fill with water.

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