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So it's all up and running and on weather comp. Starting to understand the comments now. Just had it running with room/house sat at 20 degrees and it's just a nice comfortable temperature all day long. Did have a few questions.. 1. Was disappointed as I should have done more reading, but the worcestor compress 2000 I have does not have any smart app capability. https://www.worcester-bosch.co.uk/professional/compress-2000-awf. It's not a big deal, but certainly would have been nice to see some of the data and info, especially given the unit is not in same building as house. Certainly I did want to be able to control the hot water at times, e.g when going on holiday. Does anyone know anyway to delegate the hot water control from the unit? It does allow for the stat to be delegated, and the installers set me up with the EPH stat and gateway for that. As FYI my understanding is this unit is a rebadged Midea who themselves do have smart capability. 2. There isn't any sensor attached to the buffer. Is that normal? I would have thought the heat pump would need to know the temp of buffer tank else it's just continously running potentially unncessarily? 3. When the MCS guy came on Friday to sign off he commented that it's better practise to ensure the controls are wired so that if all zone stats are off, it also shuts down the heat pump itself. But my installers said "It's wired correctly. It's to always heat the buffer, it's far more efficient, stops short cycling, and gives you quick heat up times in the cold months". Any thoughts on this one? Thanks as always.

Yeah, thanks. See attached for current progress of works. One thing I haven't finalised yet is how to control it all. Any recommendations? Obviously I want full smart control. And is it worth making use of controlling the lower and upper immersion for occasions I do need to use? Thanks

Ok thank you, will try find out from installers how they're planning on doing it. Back to your other point, that's interesting. Seems to be a heavy divide on people prioritising immersion vs exporting

Thanks for replies. When you say configuring the buffer tank, what are the options for that? So I believe they specified a higher buffer tank to deal with not all 3 dwellings being ready yet and to avoid short cycling on HP itself. Right now only the house will be operational, and mid next year workshop and air bnb dwelling will also come online. There's also a possibility we may rebuild house in coming years so for a period of time only workshop and air bnb dwelling will be online.

Hi there, After some guidance as to how best to configure and use new system that is just starting to get installed. Setup: - 22KW Three phase ASHP 400 lire HW cylinder (wth dual immersion) 400 litre buffer tank 16kw solar panels 16kw sigenergy batteries 15kw three phase sigenergy inverter Sigenergy gateway DNO permission to export 15kw myenergy eddi Context for larger setup is this system is powering the main house, as well as a separate dwelling which will be used as an air bnb and also a large separate workshop dwelling. My initial questions is around the best way to configure and use the surplus PV in relation to ASHP and HWC. I also understand you can potentially use the sig gateway as an alternative for the eddi, but not sure if it can handle the dual immersion? Any advice would be great Thanks

Ok thanks, plenty food for thought

So just so I'm clear on options... Option 1: - 18kw 3ph ASHP and UVC in annex supplying heating and hot water for all 3 buildings (annex, house and workshop) Option 2: - 18kw ASHP in annex powering heating for all 3 buildings UVC in garage connected to heatpump supplying annex only UVC in house powered by electric only for hot water in house and workshop Option 3: - 12-16kw ASHP powering house and workshop located at annex 4-6kw ASHP powering annex located at annex UVC in garage connected to heatpump supplying annex only UVC in house powered by electric only for hot water in house and workshop I think that captures it? Question is...does option 2 and 3 still allow for grant? Thanks

Does it count if UVC for annex is still powered by heat pump?

Oh I see…there goes that idea then…

Yeah the MCS installer did the heat loss calcs. I’ve asked him for the detail. Bit rough maths was 12kw for house, annex 4kw and workshop 2kw. I think I’m coming round to idea of UVC in house outhouse. If it’s to be purely electric fed would I not need a heat pump type? I think he had spec’d the uk cylinder elite heat pump one. What abput one ASHP for house and workshop and 1 for annex? But both located at garage…

Well the idea is to have zero equipment in the house so when it's likely knocked down everything can still operate. We did originally consider the ASHP on that side elevation but it's going to be a patio area as well as it gets evening sun. In the outbuilding, yep it will have UFH in the concrete slab and also hot water. A lot of different options to consider...

I'm really appreciating the feedback, thanks. Knocking down maybe in 15 years earliest. Also a possibility we won't. I think regardless of 1 or 2 ASHP, we like the idea of locating heat pump away from house. But yes, it is a lot of money, but idea is we are spending as little as possible in actual house, as for whatever reason the previous owner really over specc'd on radiators. The cold water will likely be mdpe or insulated mlcp as it will be deep enough in trench. The hot water return is therefore in that quad. I've attached a photo to show. So green line is heat pump(s) location, and other side of that wall is where plant room will be. That garage will be converted in to a 2 storey living block, with UFH on ground floor and rads on 2nd floor. It's approx 12x6m. Pink line is trench to the old boiler outhouse where it can easily connect to existing pipework for CH, H and C. It then connects in that outhouse in yellow line out to workshop which will be around 8x5m.

Thanks for the insight. We are fighting a few competing things in coming up with solution. One of the main things is we may knock down and rebuild house in the near distant future. So by housing all ASHP, HW, CW as well as new electric meter, etc in garage annex it somewhat helps with that. If it helps, we are looking at using insulated pipe like this? https://www.flowsupplies.co.uk/shop/if-bq32-32-25-20-isoflow-32-32-25-20-quadruple-heating-sanitary-dhw-160mm-duct-2067?category=21#attribute_values=350,388,454,456 If I wasn't clear, the new workshop/studio is a further 15m to other side of house which will also make use of ASHP with UFH in the slab.

Yes I think so. Why do you ask?

Yeah I will be paying bills for rental for air bnb. the garage annex will be heated from the ASHP as well. the annex is about 20-30 metres from house. The idea is plant room will be in annex. So HW cylinder and power tank will be in there with ASHP nearby outside