Pressure Relief Valves Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[withers53]

Can someone please tell me if it is legal to have the pressure release pipe from a combi boiler attached to the waste pipe from a bathroom sink? I am getting conflicting information. Some say it is ok others say it must terminate through an exterior wall. HELP please. :?

[rosebery]

Check with your BCO what they will and will not permit.

Cheers

[DEEARR2]

The safety valve discharge pipe should terminate outside the building facing downward. This is to avoid possile boiling water creating a danger or nuisance. However, it should be located in an easily visable position.

[Steve the gas]

Whilst I do not think its illegal - it poses problems such as can the waste pipe take the heat if it blows off excess pressure and the fact that you cannot see it blow off -ie a problem somewhere