Copper pipe outside constantly dripping

[carlbhoy]

Hi all, I have noticed a copper pipe dripping on the outside wall, un fortunately I don't know what this pipe is as I do not have a water tank in the loft, can anyone help with any ideas, the chalet style house is approx. 5 years old, thanks

 

[Keithmac]

Is it from the Combi Boiler?, ours has a condensate drain and also a copper pipe (possibly from pressure relief vave?).

 

[ianmcd]

what is the pressure guage showing on your boiler ? when it is dripping if it is near 3 Bar you have an expansion problem which needs investigating, or you have a filling loop valve passing

 

[carlbhoy]

It’s not the pipe from the combi boiler, (I know where that one is, we had low pressure once, and the plumber showed me what to look for regarding the leaking pipe, and also how to top the pressure up) this pipe is the other side of the house to the boiler pipe, I believe it must be some kind of overflow pipe, but without a tank I don’t know what.
Today I don’t know if it’s related but the radiators were on when the sun was out

 

[martyndc88]

Have you got a hot water cylinder

 

[undertrained]

Any old style toilets with an overflow connected? - I know some of these to have been done in copper.

 

[ianmcd]

post a pic of the pipe

 

[carlbhoy]

yes Martyndc88, it does have a hot water cylinder, and here's a picture , it also has a little guard around the bottom, so could that have anything to do with hot water?

 

[ianmcd]

Probably the pressure and te,perature releif pipe from your unvented cylinder, when was it last serviced ?

 

[Madrab]

+1 .... it sure looks like the outflow from a tundish so could be either the T&P blow off as ian mentions and/or the PRV on the combi valve for the unvented as they are often piped together.