Tip & How-To about Heating & Cooling

Dripping boiler

When your pressure relife valve on your combi boiler starts dripping (the copper pipe sticking outside).
dont replace it (usually btween 16-40 pound plus labour) chenge the washer/rubber inside.
usuall plumbing washers fit these valves( 10 pence).
STOP THINK ACT.....jollygreenplumbingmachine.co.uk.

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i have a alpha cd32 boiler,and i keep having to top the water up within the boiler,so to get hot water and heating again.i have checked for water leaks and nothing is found,however i did check the outlet pipe to outside and water was inside,im guessing this is where the water is going!!any idea why?!!please p.s when i do get the pressure over 1bar the system is fine until i switch it off.


Pressure relief valve - replace
The internal seal gets bunged up with dirt & scale and then leaks water [pressure] to that outside pipe
To avoid draining the whole system, turn off the two central heating taps on the 3/4 pipes and then operate the valve manually and / or disconnect - only a small amount of water will escape / drip to below the boiler
Replace valve and fill as before.
If you think your system needs flushing out - now is a good time
Turn off mains electricity to boiler before starting work

Mar 07, 2010 | Watts 3/4 Pressure Relief Valve

1 Answer

I have a baxi 130he which loses pressure and I have to top up once a day. The copper pipe outside which I believe is an overflow is constantly dripping. Boiler runs fine central heating and hot water.


Hi the pipe out side is the pressure relief valve change the valve or it has something stuck on the seating , changing it will stop the pressure drop

Mar 03, 2010 | Heating & Cooling

1 Answer

boiler pressure


If there is no leak anywhere in the system [pipes & radiators] Check the emergency pressure relief valve. It usually is at the base of the boiler and drains to outside [15mm pipe] where, if the valve leaks, water drips can be seen.. Looks similar to the picture with your query
Renew the valve
You can take it apart and clean it but I've never found that to be successful in the long term

Dec 29, 2009 | Watts 3/4 Pressure Relief Valve

1 Answer

i have a Glowworm 30 cxi and the light is flashing, the pressure is 0.4.... i have no water or heating...help please


Under the boiler a little right of center there is a blue/other colour knob. Turn this anticlockwise [as you look up] [twist from right to left] This is the mains inlet tap to let water into the boiler and create the pressure shown on the guage 0.5 bar is the absolute nin.
allow the water to flow in until the guage reads about 1 bar then turn off the knob -not too tight as these are plastic
If you allow too much pressure- do not worry, there is an automatic relief valve.
If the boiler persists in loosing pressure, look for a leak in all pipes to & from radiators. If no leak then check the pressure relief valve outlet pipe, it usually goes through the wall to the outside. Look at the end for water drips & if there are drips replace valve

Oct 12, 2009 | Water Heaters

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