Real Plumbing Help Plumbing and Heating Answers

The boiler relief valve, what it does, why it leaks, and when to replace it.

The boiler relief valve or the blow off valve is a safety valve that protects your heating system from building up too 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.

The first reason a boiler relief valve leaks is:

Nothing lasts for ever, Click here to read more.

The Second Reason a boiler relief valve leaks is:

The expansion tank. Click here to read more.

The third reason a boiler relief valve leaks is:

The pressure reducing. Click here to read more.

The fourth reason a boiler relief valve leaks is:

Some boilers have a hot water coil, sometimes called a tank less water heater. Click here to read more

The Fifth reason a boiler relief valve leaks is:

The aquastat or aquastat relay. Click here to read more.

The pressure should be. Click here to read more.

What does your boiler relief valve tag say?