How to get the air out of your heating system
The first thing you need to do is make sure you have enough pressure in the boiler, and that your fill valve is working and the water to the boiler is on.
Boiler and Furnace safety Inspection:
Have your boiler and furnace inspected online by a real master plumber with many years of experience.
||The one on the left is the supply
(on this boiler yours may be different)
the two green things are your zone
valves. The one on the right is your
return. notice that on the right there
are two red handle valves and two blue
handle valves. The red handle valves are
gate valves and stop the flow of water
if turned off (yours may not be red or
may be the lever type seen in the first
picture) The Blue handle valves are
boiler drains. you will need to hook
your hose up to the one of the blue ones
one at a time. with the hose hooked up
to one of the boiler drains, turn the
red gate valve off (clockwise) then make
sure your zone valve is in the manual
open position. then open the boiler
drain. till the water is flowing slowly
don't let the pressure go below 12 psi
while you do this and let the water flow
till you don't hear any more air coming
out (about 10 minutes) repeat this with
all zones that need to be purged. Don't
forget to open the gate valves when you
are done and put the zone valves back to
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For the time being lets assume that the fill valve is working normal and the water is on. You will need a hose. take a good look at the next picture Click on it for a larger image) the vertical pipes coming out from the top of the boiler are the supply and return lines of your heating system.