dpmiller

who and roughly how much? PM if youu want...

you can get 2-part trims that fit around the pipe, either round or for 45deg penetrations. https://product-information-finder.schiedel.com/uk/product/2-piece-trim-collar-45-degree/

Looks like an ESBE valve actuator but there are quite a number of types...

when the stat is "on" a tiny heating element heats the bimetal strip, so that it accelerates ahead of the ambient temp slightly.

IIRC when I was doing the calcs for ours, LoopCAD always came out very pessimistic compared to jeremy's calculator.

What thickness is the media? G3 or thereabouts is easy to get hold of in tthe garage trade as it's used in spray booths. I've a big roll of it in the attic... Tends to be about an inch thick but can be squeezed down a fair bit or "torn" into a thinner sheet.

why do you say that? 2 pipes and a couple of wires. No need for any accreditation or fancy signoff.

if it's a loose nut, you'd be best with a rubber washer

sounds like there's air in the system, tbh.

I wonder what the outside temp was last night- perhaps the anti-freezing setpoint was reached?

and it won't be at full chat all 8 hours.

try this: https://www.schiedel.com/uk/products/additional-ranges/protect-box/ we've used Ignis Protect to go out through out timber frame

I'd be more worried about pressure blowing out the H/E, they thin out over time...

we know that the Mfr's controllers tend to be pretty sh*t too, whether Vaillant, Carrier, Samsung/ whatever. @ProDave is using good old-fashioned "heat for me now" control. Time to stick a simple stat in series with the stoopid programmer...

but you could use either with copper...

you do remember the TS has a heat exchanger in it? So the output temp varies with flow rate, and the body of water is cooled as the cold water flows through the coil. /BTW I've fitted one, and I'll be using an ASHP. Convention be damned..

almost... as others have pointed out in the past, the store temp of a TS drops as you draw off, so it's hard to say what capacity you actually have. With a normal cylinder, if it's all hot, it all comes out hot.

you draw from a hot tank at whatever temp the tank is at. With a TS it's a heat exchanger and the flow temp will be lower than the stored temp. you need sufficient overhead to cover this...

there's a lot of crap in that pump.

finding the right instructions would be a help...

/what size is the expansion vessel? Is it new too?

because they installed the whole system.

blocked drain valve? Boiler full of scale/sludge?

That's a variable flow damper made out of foam and costing about a fiver?

^ as Dave mentioned, I'd be looking at the "supply" flow and return direction.