Tundish dripping - problems with invented cylinder

NJSTA16

Hello,

I have just moved into a rental property which has a UVGold unvented cylinder/immersion heater for hot water. It's linked to a thermostat/fuse box outside the flat to come on overnight on a timer to heat up, however I noticed that water was dripping from the tundish (only learnt what that was this week!) when the water was heating up.

A plumber supplied by the letting agent who manage my property has so far attended on 3 days this week and replaced the thermostat , the heating element and finally the temperature and pressure release valves. None of this has fixed the issue and I'm at my wits end worrying that the cylinder isn't safe to use and having no knowledge of this area it's impossible for me to know whether I think the plumber actually knows what he is doing!

Any advice would be greatly appreciated. I have only been in the flat a week and so far it has not been a very happy start.

Many thanks!

keith969

The expansion vessel either needs repressurising - or maybe its diaphragm has failed. Does your plumber have a ticket to work on unvented systems? I'm guessing he doesn't.

Rodders53

keith969 wrote: »

I'm guessing he doesn't.

Or the Letting Agent and Plumber are taking the Landlord to the cleaners before doing the first thing that should have been checked! :mad:

The cylinder is safe enough - that's what the pressure relief valve ensures by letting water out via the tundish. It's also a very easy, simple fix (unlike replacing the heating element).

southcoastrgi

What temp is the dripping water ?
If it's cold he's prob replaced the wrong thing

NJSTA16

southcoastrgi wrote: »

What temp is the dripping water ?
If it's cold he's prob replaced the wrong thing

It is cold water that is dripping - what does this indicate is at fault? It doesn't happen right away - I had it on early this morning for an hour and it was fine and then I've had it on to top up after doing a lot of cleaning and its started dripping after a little while.

I've absolutely no idea of the plumber's qualifications - I get the impression that he is the contractor of choice for the properties in this area that my letting agents manage, rather than being someone they have requested specifically to deal with this sort of set up. I will be conveying my anger to the agent tomorrow morning to see if that can get me anywhere!

southcoastrgi

The valve on the side of the cylinder is the temperature & pressure relief valve, if this is opening then the water will be hot/warm (providing your cylinder isn't cold & you have hot water), there is another pressure relief valve on the cold into the cylinder, so if the water is cold I'd be looking at that one in conjunction with checking the pressure in the ev or air bubble in the cylinder whichever it has