MikeSharp01

Someone like @JohnMo must have done that somewhere on here?

Interestingly not shown on the single phase diagram - we are going for an invertec model and it clearly says it can do cooling so I would expect a way to switch this over on the board.

I hadn't spotted that one I must re-listen.

We think so as long as we can meet the MCS requirements e.g. the size of the tank. As such we can always not bother with using ASHP to heat the water provided we meet those requirements to get the system across the line in the first place and then extend the capabilities of the tank through auxiliary immersion use to boost the water temp when we have guests. we will be cooling the slab and the MVHR feeds to the bedrooms. I notice today that there is talk of extending the grants to cover air conditioning but that will come too late for us. (https://inews.co.uk/news/politics/air-con-for-your-home-could-become-part-of-7-5k-heat-pump-grant-3799614)

Caught really interesting and easy to understand piece on the BBC's more or less programme today. It explains why our electricity prices are so high, how they are made up and how marginal pricing works. Catch the piece at 12 minutes in. https://www.bbc.co.uk/sounds/play/m002fj8f

The one we are targeting says it has a range from 1.85-6kW ( https://coolenergyshop.com/collections/pro-inverter-air-source-heat-pump/products/pro-inverter-air-source-heat-pump-ce-ih6plus ) which seems like a good range, has all the integrations we need / want and can be sourced via the company's umbrella scheme.

Yes it is small and the Willis route has been examined and was my choice - following @TerryE's brilliant work at the outset BUT the SAP / EPC plays against you if you do because direct electric heating is frowned upon. We are set about with downsides so a smaller cylinder and an ASHP running at its lowest setting will be our way forward I think.

We can't fit a 250l one in, back in 2016 the architect sized the utility for a combi boiler so no tank and now we have lost the boiler and gained a tank, we have literally mm to spare 550mm dia and 1500mm high is all we can fit into the space - hence me trying for a 200l Tempest - I will know in the next couple of weeks if the MSC umbrella company will accept 200l. I guess I can work out a heating strategy that will suit us. We shower first thing and can use an overnight smart tariff to do that with the immersion heater or have it heated from the PV during the day and pay the overnight loss in the morning or run the ASHP to do it when not charging the slab or, on the odd occasion, pay for full price leccy into the immersion.

Why the M2 surely that is hundreds of miles from you. Good for me though.

Bit harsh implying @Pocster is an 'odd drip' he may be odd but he is no drip or have I got that the wrong way round.

We don't, we need about 1.2kW at -2°C OAT. But 6kW is the smallest I can find and the 6kW will do the DHW.

No, not as yet but we have put it in just in case we need it as we get older.

Had a look at that (https://mcscertified.com/wp-content/uploads/2019/08/Domestic_HW_cyl_selection_guide.pdf) just left me confused, as in nowhere near covering all the combinations. Ours is a 2 bedroom place with one bathroom but also has a wet room downstairs - does not have a bath so is not technically a bathroom and if you take the US interpretation of a bathroom the downstairs WC would also be one but has no shower or bath. We need a 6kW ASHP so which cylinder do I choose, 180l? or 210l would a 200l be OK - I guess its up to the MCS crew to sort it out - Telford don't do a 210l they do a 200l and 250l Tempest with 3m2 coil. It cannot be beyond the whit to have an upper and lower bound equation with all the factors.

Just poking this thread with commercial pipe / pump I have found with which I am very impressed. We had a wasp nest down on the build and I called out the local pest guy who hove too and promptly despatched the nest with a very neat device, the cost was best part of £100 to get the job done. The device he was using was very nicely engineered and I thought I would look it up. To my surprise it is a British made and designed device and not much more than one application of a professional to own one of your own so I purchased one for £135 from the company. https://kerminator.co.uk/product/kerminator-wasp-lance/?gad_campaignid=21456132392 It has simple pump on the base with cartridge at the business end, not unlike Jeremy's design, and a trigger just above the pump from which the carbon fibre poles extend. Yesterday I had reason to use it in earnest here at Millstone manor and found it worked very well. I must get some additional cartridges but I think one could refill the ones supplied if push came to shove. I now have the basis of a summer business!

Hmmmm - doing your homework with AI can lead to all kinds of consequences- not the least of which is getting it wrong. Did you not read the disclaimer at the bottom which says, something to the effect of, AI is experimental and may get the answer wrong.