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Old Account
The cylinder won’t run empty. As explained earlier it’s capable of making as much as a conventional cylinder.
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Old Account
Just have a look next time harvest. It’s a common fault that the shump pump has an intermittent fault.
No it isn’t mate. Once the 15ltr store is empty it shifts into combi mode
Runs cold then they have to turn the tap off and back on again. The only thing I can think of is the flow switch isn’t recognising the demand from store to combi
Do they have any mixer valves?
Showers, TMV's etc?
Could it be a passing valve?
You might have ruled that out already but I thought I'd mention it as I came across a similar issue the other week.
All of them. And isolated each 1 by one. All brand new as I put them in. What was your issue.
Did you try turning the cold to the Boiler off underneath and running a hot tap? there should be nothing flowing as you will undoubtedly know.
My issue was that the Hot water was running but more often than not tepid. Occasionally it was hot and OK.
The Boiler appeared to be running OK and doing what it should do and at first I suspected other things. Turned out to be a passing valve. Not always the same though due to fluctuations in pressure.
What do you mean?
I meant that if you turned the water off to the Boiler and water still runs from a hot tap, it must be getting in elsewhere. If that is happening, when you run a hot tap with the Boiler working, it will mix and cool the DHW. It can also out balance the hot totally and allow only cold to run, depending on the system. There will always be slightly more resistance through the Boiler than direct.
If we are talking at cross purposes, let me know?
I miss understood. When the boiler cold is isolated the 2 x storage vessels empty then the water stops is what I meant. Sorry.
Oh I see. If the flow stops then no you're right, it won't be a passing valve lol.
Do you mean with a blending valve it’s the equivalent of a conventional tank?
It won’t run empty but once the 20 litres is used it just works as an 838 then reheats the cylinder when it gets chance
It’s all detailed in the previous posts mate. I would never bad mouth Vaillant’s. They are all I fit normally.
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Old Account
That’s correct I may misunderstood you scott. Yes it would be equivalent to a conventional tank of 70l
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