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peter7463h7
We recently had a 120 litre Gold unvented cylinder fitted in our first floor airing cupboard. The cylinder's pressure release valve D2 discharge pipe is plastic (originally fitted for the previous twenty year old BoilerMate) and looks about 22mm diameter. There is approx 100mm of vertical section discharge pipe between the tundish and the first 90 degree bend. There are two such bends before a straight run of pipe (with a nice looking fall) about two metres long that goes behind the bath and through the external wall and exits over a concrete path in our garden at a height of about 2500mm. British Gas inspected this last week and refused to insure the central heating under their Homecare plan (a) because of the plastic pipe, and (b) because the pipe exits over a walkway. Their inspector also wasn't happy about the 100mm vertical section between tundish and first bend. The plumber who fitted the cylinder has suggested replacing the D2 with copper (not sure what size he intends using, I'm assuming 22mm is a minimum) and turning the pipe towards the wall where it exits. Not sure what his plan is regarding the 100mm vertical section (I now realise this should be 300mm minimum, though I can't see how he can achieve this as there's precious little vertical room to manoeuvre in the airing cupboard).
I can't see any reference to turning the pipe towards the wall in the G3 building regulations. Is this an acceptable way to terminate the discharge pipe?
Also, just how critical is the 300mm minimum vertical drop between tundish and first bend?
Thanks
I can't see any reference to turning the pipe towards the wall in the G3 building regulations. Is this an acceptable way to terminate the discharge pipe?
Also, just how critical is the 300mm minimum vertical drop between tundish and first bend?
Thanks