Bleeding Radiators
If you have hot-water heat (radiators), you will need to bleed the system
from time to time. This is necessary to ensure the proper flow of water through
the system. This applies to systems that use standing radiators or base-board
radiators. One note of Caution: If you wait until the system is in use, the water
that comes out will be HOT! Also, if there is air in the system it may blow the
water around a bit.
Step 1
Locate all of the bleed valves in your system. If your system is a base-board
system you will have to open the door on the front to find the valve.
The valves on the base board systems are generally located where the pipe comes
through the floor.
Step 2
The valve on a standing radiator is usually on the top at the end. Take note of
the type of tool that will be necessary to open the bleed valve. Some valves
use valves that are opened with a straight-edge screwdriver. Some use a square
fitting that requires a radiator key.
Step 3
Start on the radiator that is farthest away from the boiler. If your house has
a second floor, start there.
Step 4
Place something under the spout. If there is no room, a piece of air hose from a fish tank
sometimes works. Remember, the objective is to get the air out, not run a lot of water.
Using either a radiator key turn the screw until air and/or water starts to run out.
Leave the valve open until you get water.
Step 5
Close the valve and then go to the next radiator in the sequence, working you way back
towards the boiler. When you have done them all, go back to the one you bled first
and bleed it again. If you get only water, you're done. If not, repeat the process.
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