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.