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So, are you suggesting bricks are the answer ? Trouble with that is that, allowing for a cavity, that's 200mm lost. Any better options ?

Hi folks Eight years ago now, I built a working area (shed, potting bench etc) at the bottom of our garden. Our garden slopes and has a nice view, so the area is sunk about 1 metre below ground level. The uphill edge is lined with external grade blockwork laid horizontally - see pic below...

The boiler isn't constantly firing, just as needed by HW demand. SO I guess it wouldn't be the dhw sensor ? I'll check the stat, thanks.

Hmm, the unit that came off only had 5 wires and had - obviously - been working OK. There's only 1 zone valve, from which I had assumed C plan. Could it be something else ? WHere would the white go to ?

It's an external programmer, should have said. yes, AFAICS it's OK.

Yep

Hi experts! I have a WB Greenstar Heatslave 18/25 boiler that has been installed - and run trouble free - for almost 5 years. On Thursday morning, when the CH was due to timed start it didn't. Basically, we now have HW (no apparent problems at all with that), but no CH. I assumed it...