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Point taken about system design. It could be my issue. But I'm having trouble understanding why the heat differential is ok when I limit the output to 14kw, but the system doesn't modulate the output back automatically. Surely it should read the temps coming back in are rising, suggesting that...

Hi all, Broader, you're right, how can we both need the same boiler, especially as I'm being told mine is oversized! Which is odd as the sizing tool on Valliants website tells me it's the boiler for me. I've played with the criteria and it has always come out the same. To be fair, the guy...

Pete and Alec Thanks for feedback. I hope we (valliant, my guy and I) can work this out. But should we have to and should I have to do crash course in boiler design theory when all I want is reliable, predictable and controllable heat. Thanks again and I'll check the link.

Hi, read your posts with interest. I have the same boiler with the same problems. Our house is 220m2. But, we don't use about a third of the house much. when we have guest we would like to heat all of it if needed, so we bought a boiler to match. We have no wall insulation and the house leaks...