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Thanks, Is it something I can look at myself?

It looks like the roof is dropping slightly, I am wondering if it's going rotten. We have had birds in there if that makes any difference.

Thanks is there a way of installing a TPRV on that?

Having looked through that it seems to me that the problem is that the pressure relief valve should be 6 bar instead of the 3 bar one that's fitted. I've messaged the plumber about that.

From looking at that it says if the incoming pressure exceeds 6 bar a pressure reducing valve should be fitted. Then something about not using the pressure relief valve supplied.

Heres the manual https://www.manuals.co.uk/tesy/bilight-80-h/manual

Also here's the invoice from the plumber for the work last time,

Hi It's a Tesy bilight 80litre tank, the importers told me the expansion vessel should be fitted on the hot side despite the manufacturers instructions saying the opposite. I spoke to the manufacturers which are a Polish company when I got it who told me that they don't bother with expansion...

Hi again, it's started releasing water from the PRV as if the tap was on full. The plumber says we need a pressure reducing valve and set it to 2 bar, the relief valve is 3bar. I want to get a decent one, my plumbers merchants do a master flow one is that a good make? Otherwise Screwfix have...

Yes Manchester It's so hard to get plumbers to even reply.

Thanks, it now has a dry trap fitted in the downpipe

He's been back and sorted it, hopefully it's all ok now, thanks for all your help.

The other thing I notice is that one of the speedfit fittings looks loose, probably from when it was vibrating

Would it normally need a trap? Any water in it would possibly dry up or go stagnant as it's not getting replaced regularly?

I checked the arrows when I bought it.

Thanks it's not got a spring valve

Hi, I've had it done now, the plumber sent me his qualifications. But doesn't this look like the PRV is installed the wrong way? The discharge is the shiny pipe. The other thing that occurs to me is that there's no trap where the copper pipe goes into the plastic waste pipe,won't that cause smells?

Thanks, I'll try to find someone else.

Hi I've just sent those pictures to a plumber thats qualified in unvented. He replied Ok mate well we have to drain it down in order to change. Gave me a price Said nothing about the way it was fitted.