How Do You Bleed a House Radiator?


Quick Answer

To bleed a house radiator, first turn off the heat, then release the air from it by turning the valve at the top of it. Shut the valve when water starts to drip, and make sure the pressure on the boiler isn't too low after bleeding.

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Full Answer

Start by turning the heat on in the house and determining which radiators need to be bled. Common signs that this is necessary include the heaters taking too long to heat up or heaters that are cold at the top. Always be careful while doing this as radiators can become very hot.

After then turning off the heat and letting the radiators cool down, bleeding can be started. Fit a radiator key or flat-blade screwdriver into the groove of the valve at the top of the radiator, and twist it slowly counterclockwise. Be sure to hold a rag at the base of the valve to catch dripping water, and use another rag to hold the key or screwdriver. A hissing sound indicates that gas is escaping. Once water starts dripping out of the radiator, quickly shut the valve by turning it clockwise.

Repeat this process on any other radiators that need to be bled. Once done, check the boiler's gauge to make sure the pressure isn't too low. If it is, use the filling loop to top it off according to the manufacturer's instructions.

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