Nickfromwales

None whatsoever, and even less of a worry here as you’re skimming new over new. This is perfectly fine for refurbishing old houses, so fill your boots. 🥾

They’ll have to raise the red vessels, as that’s on fixed pipework, but the white ones are on flexible hoses so make sure that if they just bend the hoses instead of lifting them that the hoses aren’t kinked. If you can ask them to raise the brackets for all the vessels, to accommodate the Tesla valves, then I’d do so to ensure as good job has been done as possible for the fee.

Ok. Once the glycol has been topped up, ask them to pressurise when cold to exactly 1.5bar so you can use that as a benchmark to monitor by.

Yup. Shite service.

You should just be able to PVA the wall, but then I'd never do less than 2 sets over PVA, if you want it perfect.

....they didn't top back up and run the system to bleed it after topping up the glycol.... That's what my money is on if this issue never previously existed, and has now 'gone away'. Will be interesting to hear you report back as it is best to now check it every other week and note any drop. Check it when the system is cold if you can, so the readings aren't of hot (expanded) and then cold (contracted back). Amen.

Check out https://tornado.co.uk/?srsltid=AfmBOoosdIVoVQ8X45D5y7q25CnrsiL903M2bP-rKjIiqQV0YigJYT_0

As with everything, there are good, bad, and excellent folk out there.

Likewise. My solar go to guy was as curious to know, but the industry in general (and the on site sparkies at the time) were clueless. I even drew a picture on the wall, of the how the pickup coils were positioned and functioned, to show it should be a feature that comes regardless, but also got blank stares.

For a clients build which had some deep lights and mist heads, I just used an off-cut of duct (125mm for mist heads iirc) and some AVCL to create ‘top hats’, and then taped these into cutouts. These were done after the cellulose had been blown in, but wasn’t too difficult or messy as I could push back and compress it enough for it to stay in place for cutting the membrane. A bit of cellulose fell out, but prob not equal to what I needed to remove to create some clear area for the recess, so all good. Doubt you could do this approach before insulation gets blown in, unless you somehow support these when the cellulose gets pressure filled; otherwise your inny’s would become outy’s.

I think these “should”, by the laws of physics, as in EMF passes through coils to register the flow of energy, so should work bi-directionally in principal. Depends on whether the software is told to register the flow in each direction or not, eg it charges you but doesn’t (won’t) refund you. So to answer the question, I’m not sure.

Nice. I went bat-shit crazy balancing out a 3ph system in Leicestershire, as it not only makes sense by design, but also pays long term dividends for the client of the on-site generation and consumption are given proper consideration from the outset; I’d planned the 3ph CU and circuits well in advance of the house even being built, plus all the M&E requirements et-al, so there was a plan in place for when we were allowed on site to execute all of these works. At that early stage I could plan penetrations through steels, ahead of them being delivered to site, but my favourite () bit was being able to see quite quickly that neither the architect nor the SE gave two hoots as to a) where plant was going to need to reside, and b) how pipes and ducts were to get about the building without significant compromise. Getting your ducks (ducts) in a row early on (for power / other services entering and exiting the building) makes so much light work of 1st fix, it’s just a genuine shame to see missed opportunities when these details etc have not been discussed way in advance of the construction phase. Plan ahead people!!

Net metering at the 3ph meter has been discussed here quite a lot, and makes for great reading. In a nutshell you can consume or export on any 1 of the 3 phases, or 2, or 3, and the sum of the activity affects the meter reading in balance. So, you can have a solar system on 1ph, exporting, and be pulling in power over L2, and if it’s 1kw in and 1kw out, the meter stands still. No need for a 3ph ASHP, but 3ph solar and batteries is now pretty easy to resolve, so don’t panic too much here just get the right advice off the right people. @lookseehear If you want a very good designer and installer that doesn’t charge the earth let me know, (PM). If you choose well, then you can connect ASHP > solar > batteries > hot water > EV charger in one family of products that “talk”, with the advantage of rapid EV charging with 3ph. You can have bigger solar and batteries on 1ph, just then you’d go for a hybrid system so the number of panels and size of batteries isn’t the value you ‘ask’ the DNO for permission to connect to the AC grid, aka “AC coupled equipment’”, just the size of the inverter is declared and whatever’s behind the inverter is then of no consequence. Plenty of options and solutions, and I’ve done a good few domestic new builds where the clients had 3ph and large on site micro-generation, with a mix of 1ph and 3ph equipment on site. When I explain the many available options to my clients, with reason / rationale (and how the entire electric arrangement can be harmonised quite easily), the fog soon clears; it’s just folk don’t know what they don’t know, basically. Also, there’s way too many salespeople out there which is why I stay impartial. Lots on here on the subject.

Yup. Zero discernible diagnosis going on here afaic. I’m stating facts. They’ve not stayed to diagnose, they didn’t rectify the zero pressure on the heating situation, they’re just swapping out knee-jerk items hoping that the most common fault is the fault here. The flip side is that someone better could come and actually do some investigation, and THEN start handing out invoices or requests for deposits; (requesting a deposit for stock EV’s is crazy). This screams of them not wanting to be left out of pocket or holding the baby if their assumed fix doesn’t fix it. I expect they’ll get paid and be gone, but the issue won’t be gone, just forgotten for a while. Cold water coming out of a heated UVC is not an issue for T&PRV, so it looks like the issue is the 6bar PRV has opened on the multi-block which means it is that which has failed; likely needs to be stripped down and cleaned / serviced, and then tested for normal operation, before anything else gets changed at (likely significant) cost. I’d be asking what makes them think the EV’s “have failed?”. I'd be asking if the fault returns will they then come and fix what it actually was that’s wrong, on their dollar. I'd be asking why after a service you were left with a system with zero pressure in it. Just crap. Seriously?

One per vessel, so 1x red, plus 2 (or 3) for the white vessels.