The boiler relief valve what it does. Why it leaks and how to replace it.

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The boiler relief valve or the blow off valve is a safety valve that protects your heating system from building up to much pressure and possibly blowing up.

It's a very important part of your heating system. Some times the relief valve or blow off valve will leak, and naturally people assume that it is because the relief valve is defective.
Sometimes this is true, and if it is leaking you should replace it even though it is leaking for other reasons.
But it may just be doing it's job. There are 5 reasons a relief valve leaks.
Click on any image to see a larger image.


The First reason: Boiler Relief Valve

Nothing lasts for ever, and a relief valves or blow off valve will ..... MORE

The second reason:Boiler Expansion Tank

The expansion tank on a boiler allows the water in the boiler to expand. Water can not ..... MORE

The third reason:Watts 1156 boiler relief valve

The pressure reducing or fill valve for a boiler is set to only allow 12 psi in to the boiler. If this valve fails ..... MORE

The Forth ReasonBoilermate with Burnham boiler

Some boilers have a hot water coil, sometimes called a tank less water heater. Some times a coil will develop ..... MORE 

The fifth reason:Secondary Boiler Aquastat

The aquastat or aquastat relay, This is a very important part of your heating system. the item in the picture to the right ..... MORE 

Boiler gauge settings:Boiler temperature pressure guage

The pressure should be from 12 psi to 18 psi
The Temperature should be between 160 and 180 degrees f. but can be up to 200 degrees f.

To replace a relief valve. Turn the power to the boiler off, let the boiler cool, turn the water to the boiler off, remove the drip tube from the outlet side of the relief valve. (this must be put back after the relief valve has been replaced) Drain the pressure off the boiler, remove the relief valve, make sure you replace the relief valve with a boiler relief valve of the same rating, DO NOT USE A WATER HEATER RELIEF VALVE ON A BOILER. after you replaced the relief valve and put the dip tube back on, turn the water back on and purge the system, then turn the power back on.
Don't want to try this yourself? Use the
Open Dialog Service   See a stuck boiler gauge

It's very important, that you read and understand the instructions written on the boiler relief valve tag, the tag is on the relief valve under the lift lever.
The print on this tag is small, and many times, even though, the first thing printed on the tag is "DO NOT REMOVE THIS TAG", the tag is removed.
So to help you read this very important information, I typed it out, so that you can read it.
Please follow the following links, to read both sides of the boiler relief valve warning tag.
Read the front of the boiler relief valve tag
Read the back of the boiler relief valve tag

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