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Thank you all for your replies, and apologies for the delayed response. I have decided a few things from this thread: 1. My water cylinder should just be for heating DHW, and I am going with a Stiebel Eltron 150, which is 50 bigger than what I have now in my rented flat. The cylinder I suggested seemed too good to be true, and it was. 2. Underfloor is a great idea but I'd need to take up all the parquet, insulate my existing concrete base, put back down the parquet, which would be horribly expensive 3. Focus will be on insulating the home and triple glazed windows, with electric heaters to heat. Again using the same brand as I have now which is Blyss. 4. The extension can have underfloor and the method (water/electric) is TBC. Thank you again for all your replies.

Thank you for your replies, I am going to try to answer all of them to give the context. I am talking about an air source water cylinder that goes inside the home and heats the water directly. I found this one that appears to be suitable for both DHW and UFH together: https://www.modernheat.co.uk/product/2484 (I hope links are allowed?) I have a space in my bathroom where the old hot water cylinder is to put it. I am not living in the property, and can't until hot water is installed, therefore the energy needs of the home are not known. The boiler was from 1988 and does not work. The property has single glazed windows and very little insulation, so any heating system would be insufficient right now (I sit next to a little electric heater when I am there and I struggle to get the room to 12c). We are looking to replace all that with double glazing and insulate properly. The floors I am looking to use UFH on are concrete slab with parquet on top. The parquet needs sanding and re-laying, so it will have to be taken up anyway. The amount of water needed seems important as the cylinder should be able to cope with that AND baths/showers? The area we'll underfloor heat is about 100sqm with standard height ceilings. The other rooms will have electric heaters for when they are in use (which won't be often) I currently run my electric water heater (at my rented accommodation) at about 45c, turning it down to this temperature actually saved me quite a bit of money. In summer I turn it down even more. This means I don't have to add cold water to a bath or shower. I've read that UFH can be run between 45c and 65c, so this seems about right to serve both? (I could set it higher for UFH and just add some cold when washing, most people do that anyway, and I wont need UFH in summer so then the temperature is irrelevant). And re solar panels, we've been told we can get 12 on the roof and 6 on the flat roof, we just need to decide if we do the extra 6 or not. It seems like the general consensus was that this plan isn't a good idea. Hopefully the extra context will help.

Hello, this is my first post here so please be kind! I have just bought a house that requires full renovation. One of the topics I've been passionate about since I was a kid is green energy, and I am really excited to see the new technologies emerging like ground source and air source as well as more established technologies improving such as insulation and solar panels. I am considering switching my hot water to an air source cylinder and installing underfloor heating powered by the same cylinder. I estimate I need about 200l hot water a day for showers etc and about 60l of water to power about 100sqm of underfloor heating. I am really new to this so I have a couple of questions I hope you lovely people can answer. 1. is 60l about right for 100sqm of underfloor? 2. can I run both my washing water and my underfloor water off the same cylinder and not get ill from the water going around the system a bit? 3. Is this a good idea overall since it seems scarily cheap compared to other options (eg ground source pumps). 4. Is the bathroom a good place to put the cylinder, my theory being that the bathroom will get hot during showers and baths and the cylinder can pick back up that heat more efficiently than in a cold room? Thanks in advance!!!