- 1). Shut off the power for the boiler. How you do this depends on your installation. In some instances, this might be a switch inside the boiler closet. In other cases, you may need to turn off the power to the circuit that holds the boiler. In either case, wait at least two hours for the boiler and water inside to cool to the touch so you can work on it.
- 2). Turn off the water supply for the boiler. Usually this will be located on or adjacent to the boiler itself.
- 3). Go inside the house. Locate the radiator that is furthest away from the boiler on the upper floor. Open the bleeder screw.
- 4). Open the boiler relief valve to disperse the pressure inside the boiler. Attach a garden hose to the drain on the boiler. Open this up and allow the water to drain.
- 5). Use a large plumber's wrench or pair of pliers to rotate the boiler drain bib counterclockwise. Apply penetrating lubricant and allow it to sit for a few minutes if it is stubborn. Remove it and set it aside.
- 6). Clean off the threads on the boiler drain outlet with steel wool. Wrap the threads with plumber's tape.
- 7). Thread on the new boiler drain and tighten it with the wrench.
- 8). Close the boiler drain relief valve. Ensure that the boiler drain is in the closed position by turning the valve clockwise as far as it will go. Restore the water supply for the boiler by opening the valve.
- 9). Close the bleeder screw on the radiator inside the house.
- 10
Restore power to the boiler and check it for proper operation.
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