How to Bleed Air From a Peerless Hot Water Boiler

A Peerless hot water boiler circulates heated water through the home via pipes that are connected to baseboard radiant heat units in each room. A recirculation pump keeps the water moving through the system. Sometimes air can enter the system, which can cause the boiler not to heat properly. Bleeding air from the system is a process that removes the air from the pipes so that only water remains. You can bleed your Peerless hot water boiler using a straightforward procedure.

Standard screwdriver
Slip-joint pliers
Old towel

Instructions

- 1
  Locate the highest baseboard radiator unit in the home or the one that is the furthest away from the boiler.
- 2
  Identify the bleeder screw on the unit, which is usually on the top of the unit on the right side.
- 3
  Place an old towel on the floor under the bleeder screw. Turn the bleeder screw counterclockwise two to three turns using a standard screwdriver. Leave the screw open as long as you hear air hissing out. When the air has been expelled from the system, water will spurt out of the bleeder hole (in some cases water will not leak out of the bleeder hole, but the hissing sound will stop). Close the bleeder screw at that moment by turning it clockwise until it is tight.
- 4
  Find the isolation valves on the pipes connected to the unit. Shut off one of the valves by turning it completely clockwise. Use a pair of slip-joint pliers if the handle on the valve is hard to turn. Open the bleeder screw again and let any air exit, then close the screw. Open the isolation valve and turn off the other one. Open the bleeder screw again and let any remaining air exit the system. Open up both isolation valves.
- 5
  Repeat the entire process for each baseboard radiator unit in the home.

How Much Does It Cost to Add Air Conditioning to a House?

Setting Up a Wood Stove Pipe Damper

Heating & Cooling Repair