dpmiller

I wouldn't be trusting an IR thermometer pointed at a shiny metallic surface...

it really seems like it's not going down far enough. Sometimes the little "rings" on the posts are hard to compress the first time round and can take a wipe of lubricant and quite a bit of force to get them started. Try also pressing the button in whilst pushing down. /stupid Q- you haven't fitted multiple different seats and managed to swap the fittings over?

yes, but do you need to use the button to release it or will it pull straight off?

Kooltherm is Phenolic, not PIR?

yes, undersink drawers are a thing.

and you've tried poking the internal valve to free it up as recommended?

^ I'm with @ProDave on this, any bit of solar gain is good, even if it just shaves a few seconds off a defrost...

these are waterstop connectors, and they were left with no male fitting plugged in over the winter? The wee valve has probably got a bit of corrosion on, have you tried (say) giving it a tap with a screwdriver down the hole, or such?

If you don't use a prepared for- or installed- MVHR how do you deal with humidity and "odours" in the wetrooms?

Oddly enough we had the opposite experience. We're in a Project Stratum area, with service provided by Fibrus. Theoretically at least. Our house didn't exist during the Stratum survey, and so does't attract a grant payment for Fibrus. "Sorry sir, you're property isn't included" A chap from OR came out (chargeable survey, but they didn't tell me that to begin with...) and said "what's the problem? We've a fibre node on the next lane" and poles from there carrying a copper line to our neighbours. He explained that they would bring an 8-fibre bundle 200m in on the existing poles to cover the four houses in our little clump and call it "network expansion". Good value apparently. And so fibre arrived to the pole, I buried the ducting OR delivered to me, and the installer happily brought the fibre in, through my internal conduit, and put the ONT in my chosen position in the plant room. /subsequently, the three other houses all got Fibrus, and Fibrus have pulled three seperate fibres, all from a second node point on the same pole on the other lane.

2 ducts to 1 plenum.

so is it likely your spray lubricant has swollen the rubber?

just like they use in chippys then?

CoolEnergy units modulate on DHW both by power and pump speed, and can do WC on DHW also

has the system been correctly commissioned and balanced?

you say that, but is it true?

Good Q. The inlet pipe is plumbed right to the bottom on these and there's only a small overflow hole toward the top of the sampling pot. We had an issue with the pump last year which had it out of action for a week or so. At no stage, running or not, have I ever seen any floating scum layer. I've been advised by the reps of two different distributors that even a couple of weeks without power won't affect the output quality of a mature plant noticeably

you'd need to have a problem for quite a long time as there's 400mm or more between the normal level it pumps out down to, and the "overflow" height.

Correct. It's an SBR- Sequencing Batch Reactor. It goes through a run of aeration and settling cycles before a final settle and pump out.

in our case the Solido airlifts well above the outlet, into the sampling pot, and this then overflows to the outlet

some TPs have a sampling point built in

Hello. near neighbour...

exactly what kind of breaker tripped in the CU?, was it an MCB? RCBO?

what is the actual thermal quality of the TLA and does it need to be topped with a screed anyway?

some systems just display the "programmed" fan speed whereas some can I believe alter the fan speed to keep airflow constant as filter restriction rises. Seing a marked change in fan speed would hint at the filter being blocked in this case.