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When you mention that it can only be the pressure relief valve.....are you referring to this expansion valve or PRV valve (6bar) that's built into this combination water valve? OR are you referring specifically to the temperature/pressure relief valve (10bar) attached to the hot water cylinder...

sorry that info just overloaded me :) not wanting to pretending i fully understood this....

My interpretation is when the hot water cylinder heats up, within 10-15mins water "continually" drips via the tundish. Its only stops discharging when the call for heating on the hot water stops i.e. motorised valve stops and boiler halts. The tundish discharge consistently happens under this...

Apologies, it's definitely only dripping or running water in the tundish when the hot water schedule kicks in to heat the water cylinder. After 10-15mins water can be seen in the tundish "continuously" until such time when the motorised valve kicks in to stop heating things. At that point, the...

I assume depressurizing it by turning the stop valve off just below the combo valve...then opening the hot taps to take the pressure off. I believe they did that, and then check the pressure on the EV...topping up appropriately. They did not disconnect the EV physically if thats what you...

Yes discharged water is initially cold, then after a period its technically more like lukewarm (but not hot). I can certainly understand why that might be the case, as I would expect water flowing in the green paths would become slightly lukewarm as the water is all connected to the cylinder...

I'm just your avg joe and not G3 certificated. So probably not a good idea taking things apart. Other than describing observations of the system as it stands.

Like I said before, i've had a service carried out on the unvented system. The expansion vessel was checked and there is no water when pressing the valve pin. It was slightly under charged 2.8bar and was then topped up appropriately during the service. Unfortunately this did not resolve the...

Hi, We have an unvented hot water cylinder for some years. Recently we notice an issue with water dripping via the tundish suggesting a fault. This only happens when the hot water scheduler comes on to heat the water. Within the first 10-15mins we notice water dripping via the tundish, and...