JohnMo

MEV is a single fan unit with all wet rooms feeding into a single unit and then to a single outlet through the roof. Get an intelligent one that alters fan speed based on demand, and install humidity activated extract terminals. Then add humidity activated trickle vents, for a fully demand operated ventilation system.

People say the same for timber construction, which is standard building method in Scotland. No one has issue with finances or sales. External insulation has been given out free for ages by the government, so not seeing the issue there either. Personally I wouldn't do block or cavity build, it would be ICF or twin stud timber frame, as I could do both myself.

If your a new build that is pretty airtight with MVHR and decent insulation, unless the house is 400m² I doubt 7kW is correct, especially near Cambridge.

Why MEV instead of dMEV if venting via roof. But that's another topic. Hybrid is fine as long as all the details are worked out and followed. Warm roof also fine as long as all details are worked out etc. Doesn't make either easy to do well You can do that, but you still need to fill between rafters at the wall to roof insulation gap and stop air movement and give continuous insulation layer.

Insulation above roof is in theory easy to do. But you need to detail well, think about how you seal the gaps between the roof insulation and join to the wall insulation. If you rafter is 150mm high you have a gap 150mm to fill at every rafter. Why not through wall? Hybrid roof insulation Can be a recipe for disaster if you don't follow the rules and have a sound basis for construction.

Or don't bother with cavity - block wall and external insulation? You can see exactly what is going on.

XPS poly beads, every gap is filled around the whole building, any damp gets in the poly beads allows it to drain away. Easy

Poly beads.

Factor of safety

If doing a timber frame, look for cold bridging at the wooden sole plate and foundation also. Then design out.

Ballast buckets, do a good job of spreading loads

FH Brindle, Made2Measure. Make sure if you have a drop the other side you get the correct structural specification. Also if in a high wind area, you also account for wind loads.

I would worry the centre of the plasterboard sagging with a 1m span.

I would strongly suspect the tight curve on the flexible hoses and the tube inside collapsing. The angle changes need to be taken up with solid elbows, the flexible is there to absorb vibration and noise transfer, not really to change direction.

I definitely wouldn't have the Flexi on a curve, they definitely aren't like hydraulic hoses, so more likely to collapse over time. Why do you have you flow set at If you are restricting flow to get that I would take that restriction away and allow pump to modulate (if it does). Even that is low, a 4kW should kick out 20+L/min, the bigger the heat pump the higher the flow rate.

So back to my original question, why is this any different from a CU where you generally only have Twin and Earth cables enter, the other sheath is removed and the tails connector to the stuff within the CU. Both this and CU are basically a locked box?

The wires look the same to me, first image from the liked website, the other the OP. OP's not tidy and thrown in, but tails look the same - what is different, as I said simple terms would be good. So anyone following this can actually tell correct from wrong.

So, looking at the images there appears to wiring exactly the same as the OP, so whats the issue? What is non compliant?

Isn't it already in containment, it's in a big box. So what's the difference from a consumer unit, you open that box and you see single insulation wires. No idea of the answer, just a confused - simple terms learning lesson would be good

Seen a few vids with it wet/damp. Suppose to dry out over time https://youtu.be/v_OmMxSbOSw?is=NxKx-3p3KCIq62rJ

Sounds like an overthink it Sunday.

They also import the coal - not energy self sufficient. We don't have much coal as proven reserves, so you are saying the policy is build coal powered power stations that rely on imported coal. There is zero business case for that sort of project. Why would anyone spend there money on that. A power station that has been shutdown and not had preservation maintenance completed will be good for scrap only. All the rotating equipment (turbines generators, pumps, fans) will have bowed shafts, the bearings and seals will be no use. Think the l'm for coal lobby, live in a make believe world, that doesn't exist. I will bow out now.

I was thinking similar.

Your wasting your time and effort, they have possibly just swallowed all the miss information, from social media and now that is the only thing they believe. Coal, we have about 23 million tonnes of proven reserves in 2023, adding a generation efficiency of 40% that's about 70TW/h. UK uses 300+TW/h. So coal lovers get real, you would power the UK for a few months, then need imports. NOT SELF SUFFICIENT!

All the talk is about banning social media for under 16, just ban it all together. So much miss information told as a truth, and then the algorithm just points you at similar rubbish. People that don't have science background just lap it up. Sat next to guy on the train he was telling me that people are daft having solar especially in Scotland, I told him how much I had exported so far in March, he was was quite shocked. Also told him what I paid for it as a self install, he expected tens of thousands, not the couple I actually paid.