This is knocking and water is leaking from somewhere you can't see what's causing it?

[dilalio]

Call him and get him back. He can't argue with arrows on prv.

 

[endecotp]

https://www.bpfpipesgroup.com/media/69675/Discharge-from-unvented-hot-water-storage-cylinders-v2-April-2023.pdf

A trap will dry out. Use a HepVo or similar.

 

[Gary111]

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

 

[Madrab]

Get him to fit a HotTun or MCalpine TUN5-CL valve

Both are spring loaded and will stop any foul odour ingress





Oops - just saw the update

 

[Gary111]

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

 

[CountryFan]

Get him to fit a HotTun or MCalpine TUN5-CL valve

Both are spring loaded and will stop any foul odour ingress

View attachment 380695

View attachment 380694

Oops - just saw the update

Those McAlpine ones can’t or shouldn’t be used on unvented safety discharge

 

[dilalio]

He's been back and sorted it, hopefully it's all ok now, thanks for all your help.
View attachment 380690View attachment 380690

So why didn't he do it right in the first place? Feck me. You live in the wild. West?

 

[Gary111]

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

 

[Madrab]

That'll teach me to read the MI. Only ever used them on Condensate as the air break so just presumed given they are PP that they would be able to take the heat.

 

[Gary111]

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 reliance but some people complained about noise from them.

Thanks

 

[endecotp]

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?

I’m surprised that you are considering buying the part, not your plumber. Do we really believe that this plumber is competent?

(If you’re actually doing this yourself, you might as well tell us.)

Does this only happen when the heater electricity is turned on, or does it also happen when it is off?

What is the make & model of the heater? Do you have the manufacturer’s instructions?

Edited to add:

Here’s the distributor’s web page:

TESY BiLight Vertical Water Heaters Archives - Modern Heat | UK Specialists in heating systems

TESY BiLight Vertical Water Heaters – energy efficient, low cost hot water heating for UK homes. Reliable performance from Europe’s largest electric water heater manufacturer.

www.modernheat.co.uk

I can’t find any detailed installation instructions. Interestingly the pressure relief valve that they sell is 3.5 bar, not 3 bar. They don’t sell a pressure reducing valve in their “kit” (some other unvented heaters do). Does it not have it built in?

The thing we can see in the photos is presumably a non-return valve, right?


Edit again:

I’m looking at the instructions for a vaguely similar HeatraeSadia product, here:

https://mediacdn.heatraesadia.com/-/media/themes/heatrae/literature/installation-manuals/multipoint-eco-vertical-30_100-quick-fit-manual.pdf?v=1&d=20181123T111149Z

I note that they fit the pressure relief valve and the expansion vessel on the INPUT side of the heater. You have them on the output.

I’m not a plumber. I don’t know much about this at all. But I’m worried about what you seem to have there. You really don’t want this thing to fail.

Hopefully someone more knowledgable will be along sooner or later. In the meantime, I think you should keep it turned off.

 

[Gary111]

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 vessels over there.

( The previous 80 litre tank that was in service for a long time also had no expansion vessel or PRV)

 

[Gary111]

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

 

[dilalio]

Bloody ell!
That's the same invoice template I use

 

[Madrab]

That unvented cylinder is such a European design. It already has a pressure relief valve on the inlet - black handled valve, it's outlet should be connected to a tundish too, given the cylinder has a working limit of 6bar then I guess that valve will have that limit - The Expansion vessel and pressure relief valve will be a UK safety requirement too. Surprised it doesn't have a Temp/Pressure relief valve too for UK regs - the 80L advert has one fitted


The MI also states a pressure reducing valve but it has that specc'd to =< 6 bar. Has your mains pressure been tested? Is it above 3 bar static? The MI also states that other safety valves shouldn't be used, it's all a bit of a mess TBH

Looking at the installation instructions for it, unfortunately they're terrible, no benchmark nothing and a really bad translation - as usual with these things -TBH - I Honestly wouldn't ever recommend that equipment to anyone here in the UK in it's supplied form