Nickfromwales

There's plenty or rectangular > round adaptors for domestic ventilation, so I'd be more focussed on what external grilles tickle your fancy and then work the problem back from there. If your builders can't stitch-drill a near perfect rectangle then you've got the wrong guys afaic.

Fair do's, you must both feel 10' tall. Any plans for the ass-ends of those joists where they're hanging into the cavity......

and exit it how/where?

Windows isn't something to want to have to revisit, and the AT score is something you should get as good as you absolutely can if installing a decent MVHR unit.

Money well spent, you'd prob spend half that on some BS repair and then never be able to take your eye off it every time you used it.

Waste runs are all drawn with 90 degree changes in direction, but that's the worst possible route. You need to go in arrow straight lines to the nearest 110mm pipe and rectify as you meet that. Nothing wrong with the waste pipe for the basin teeing into the 50mm pipe for the shower btw, just keep the basin run in 50mm until it turns vertically out of the slab, then once above you can convert to 40mm rising to a 40mm bend to accept the basin waste. Install a 32x40 reducer in the outlet of the 40mm elbow and then run a short piece of 32 to the basin trap. Same for the bath, take as straight a line as possible. With all the pipework in 50mm you won't have issues with gurgles etc at the basin when showering, or need any air admittance. Use solvent weld adaptors at the 110mm bosses, vs the types which use a rubber bung. I'd just shutter out the entire area of the shower, slightly oversized, and then you can have all options left available to you. Bath traps do not go into the slab, they are almost always above ground for access/service. Some very deep baths or stone/marble ones are the exception, so please state which bath you'd like and we can help accordingly.

House fires are unpleasant, and that's if you're home to put it out.... Get rid, buy a better one. A molten plug will just allow a catastrophic failure to occur. I bought a used TD and put it in the upstairs play room, and then the smoke detectors started wailing a few days later. Smoke billowing out, but turned out just to be the cap frying. Flung it immediately and went out and bought a brand new bosch after sitting down and considering the consequences of losing everything we own. (expletive deleted) that!!!

What have you tried so far to separate them? Can you get a corner apart?

I’m hesitant to ask, but did you go for a hot return to combat long runs to taps and to alleviate waiting for hot water to arrive?

Ok, so we’ve covered that your SE is on crack, but at least your floor won’t suffer the same way. We can set this lunacy aside now I guess. But I just like to say, after seeing the 100mm substructure, (expletive deleted) me down!!! 😳. Space x has a new home for next launch lol. Right. Back to UFH. Just go on top as going under and then dropping a Titanic amount of steel on top of the pipe is fraught with danger. If the pipe gets damaged you’d have to lift it all out, replace the pipe run, and go again. And repeat.

Not that I know of, I just used 19mm or 25mm depending on whether it was running through voids or in the plant room (all copper in the plant rooms); metal seems to be worse than plastic for condensation.

I'm guessing people don't let you have the microphone at family gatherings?

Sorry, a few beers in. To answer your exact question. In cooling the HP is told to output the lowest temp setting that a particular emitter will require, so for FCU's or AHU's the temp is set as low as 10/11oC, and the HP has zero idea of where this is ending up. From the HP this 'chilled' water goes to the buffer tank. The UFH sucks this water out, mixing it with the grouped return, via an Esbe digital mixer and upstream dedicated PWM pump; mixing required to cap the max cooled flow temp at ~15-16oC (user-engineer definable per situation of course). For the circuit for AHU (in my previous 2 scenarios) the flow from the buffer just gets pumped direct, no need for additional mixing to occur, and job done. There isn't a manifold to speak of, just 2x pump sets (or more), with 1x being blended for UFH, so I guess you'd say that originated from a low loss header created by the plumbing arrangement post buffer. Obligatory manifolds for the UFH loops, but no pump/blender on them with the SE design.

This is where all my crackpot ideas fell face down in the early days tbh. I ended up with Stiebel Eltron ASHP and controls / mixing arrangements etc, as their kit just does this all so utterly seamlessly. Very expensive kit, but when you sit down with self-build newbies and give them all the information, they soon realise what a comprehensive solution these delivered, and how little input as occupants they then had to provide. Just one box on the wall, and you tell it "I want to be x temp", and it does so, irrespective of sun/rain/snow. Combine this with the SE kit having an output that manipulates the MVHR too, to provoke a pre-determined boost when cooling, and the circle is complete. The heat pump division of CVC (Oxon) have worked with me on these projects, turning my visions into reality (with a few intensive debates along the way); I am a stubborn mule of a man and want the best each time. They still answer the phone to me, so all good lol.

I should say I am not a fan of FCU (wall mounted 'radiators') in a modern domestic setting, far too utilitarian afaic. My favoured option, looking into this quite intensively atm for a new clients proposal, is to have the FCU remote and ducted to the open areas such as landings, hallways, and associated thoroughfares, so the system does the job with as little 'intrusion' into the interior architecture as is possible. My ethos is that the M&E proposal should provide a non-intrusive solution where the dwelling can maintain a pre-selected ambient temp vs switch on to deal with the issue; if this ethos is adopted then the requirement for injecting large amounts of heat energy at adverse times of the day should be mitigated against, ergo the system is on 'long and low' and is working away in the background with as little audibility or inconvenience as is practicable. Heat will move to cold, so by purging the living spaces, landings and thoroughfares, the living spaces and 1st floor bedrooms should naturally stay at much more acceptable ambient temps, and be 'cool' after the sun goes down and well in advance of putting ones head down of an evening. This also suggests that the brunt of this transfer of nuisance heat (energy) can be offset by the thing causing the issue (solar PV > sun).

You're quite close, so I don't need to be kind, also I have been dabbling/learning about cooling since 2019, and am still learning as the market, its products (and R&D), and suitability becomes better known. FCU's are a dead safe bet afaic, and yes the issue would be with diminishing 'energy' arriving at each unit (if installing multiples) so I'd do the insulated runs and have them all as radial runs back to a manifold; this gives more flexibility for downstream fine-tuning etc imho. I now see what you mean by 2 circuits, 2 types of emitters supplied either direct from HP low temp output in cooling mode or via an Esbe mixing valve for slightly warmer water to get to the UFH. This is exactly what I have done for 2 previous clients projects, so am 'feeling ya!'. IIRC we sent 11-12oC to the AHU and 15-16oC to the UFH in these instances, one a PH+ ICF build and the other an MBC PH TF, both with rafts founds.

@Galvin1972 is trying way too hard here, and Mr-a-certain-Mcloud is not quite as much of an expert in anything as he is a TV waffler, let's be honest eh? Also prob thrives on getting stuff for feck all so not so worried if the plan fails; and the companies enjoy the NDA! IR panel heating is utter shart and expensive as feck to run, and would be the absolute last thing I'd ever consider for space/central heating. Mention the <90oC surface temp if the thing has to be turned up to output it's max stated wattage, and then people with pets, kids or infirm just say WTF?? Not just shart and expensive to run, but dangerous too. It's akin to when some brainwashed people knock my door to convince me that a man with a beard rides a cloud in the sky and watches over his flock.....for flocks sake..... That is how this sales pitch comes across, embarrassingly desperate for approval, so time to relegate it to the fiction section and move on to something worthwhile.

It'll drop to 20%, not by 20%, that's a major drop for a fan coil. Circuits? Please give more info, eg pipe size etc, and if you're referring to doing 2 runs to 2 FCU's vs 1 & 1?

I guess I'd play about with lowering the flow temp incrementally, to gauge the effect, as it's prob not good to go too far and have the system cycling because the cooling effect outperforms it's task? Isn't the HP working a lot harder for longer to do major temp drops too?

Ffs. 🤦‍♂️

Whatever the choice, as there’s dynamic loads from this being a terrace, I’d put 2 layers of decking board under the covering of choice, joints staggered, for bent & braces. Screwed and glued together and NOT nailed. I’d also buy some pedestals with the biggest possible bases, to spread to point load as much as possible.

@Pocster is possibly putting together, history’s “most shite” CV

You can never get away from that, and is where the client must be responsible for doing their own diligence, I’m afraid. Lazy clients will fall foul, simples. If you don’t know what to ask or what to look at / for, you should be using a consultant from day dot. “Fail to prepare, prepare to fail”, I heard that somewhere

I disagree. I’ve met sooooo many who hide behind a qualification they just scraped by to attain. I’ve been next to PH ‘savvy’ and qualified, and beaten them. Load of tosh and supersonic websites. The majority of bad work I’ve seen over the last 20+ years has been by companies or professionals whom the clients then state that they simply cannot believe have let them down, often badly, often with significant cost repercussions. I have a VERY firm grip on myself, thanks the same. I never asked a friend to give a recommendation, never said that I did, only independent, unique clientele who speak the truth, warts and all, which is the best possible reference you’ll ever get or give. End of. Websites with references can be, and sometimes are, engineered or fictional. Trusted trades websites offer a service to remove negative reviews for a fee ffs. Wakey wakey time folks! Nobody sends a professional to seek a reference, where do you see that happening out of curiosity? Feedback from a previous client(s) has won me lots of work, even when they say certain things could have been a bit better but overall the result was positive and the outcome good or great. I’ll take that level of transparency every day of the week with any company or professional. Results are results, and they’ll always speak for themselves. Most BCO’s who visit my jobs spend more time asking about the level of workmanship etc than looking around checking the job over. They see someone who knows what they’re doing within minutes of being on site. They do. And get told a load of Enid. Where had anyone suggested that they do, or that they should do this?!? A mate of mine dipped out of school early and became a bit of a toe rag. Zero quals. Now if I put him and his oak work up against some of the best, he’ll outshine them. Qualifications don’t impress me one bit, being able to do the research, solve problems, work with the client to ascertain their needs/wants/wishes, find solutions to get that end result, and deliver this with pride and passion, wins the day. I only reach out to bonafide designers when a system needs to be compliant and the paper trail needs to be complete, eg anything like electrics, ventilation, fire, structural, and so on. We share very different views on this, but that’s what makes the world go round I guess.

Loads of shitheads hide behind so-called qualifications. Pointless looking at those, you just need to look at previous work, or to get to speak directly with previous customers. I’ve had a recent potential client reach out to others I’m working for, so they can vouch for me, and there’s nowhere to hide then as these chats are undertaken well away from me. Proof is always in the pudding, just unfortunate that this one’s a tuna melt. The intolerable part here is this chaos ignorance, blame-shifting, and incompetence, plus most builders leave their +1 behind with a labourer, offer minimal information / GAF, and leave them to their own devices. Results speak for themselves.