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electric underfloor heating is only really designed for retrofitting into bathrooms/wetrooms (a small area) to be honest. Maybe new-build homes/flats that have no gas heating of any kind would consider it. It will cost a lot to run. Is there any reason why you wouldn't have radiators/hot air...

what is that? lol the white boxes (transformers) should be somewhere (accessible) out of sight e.g. ontop of the cupboards, with the low voltage wires going to the behind the lights. You shouldn't be able to see any wiring at all

There's no problem with naturally vented appliances, as long as there are adequate non-closable air vents in the room they are fitted. Extractor fans in other rooms will not cause the appliance/fire to backdraught, as long as there are air vents open

It's ok for the recessed light casing to touch the RSJ's, with timber joists they would cause charring with the heat. You have to choose 1/2 hour fire-rated downlights like the ones from toolstation (which come with a metal recessed cylinder)

Sorry about that. okeydoke, I think I'll tee the returns at the bottom, so that when the boiler's running, very little spent cold water from the PHE is being returned to the bottom of the tank and instead going back to the boiler for heating and returned to the tank hot. I think I'll still use...

ok, thanks for all this advice, I hope you're getting something from it btw and I'm not just draining your knowledge base lol. The only reason I thought of returning the PHE to the boiler's return is so that WHEN the hot water valve is switched on (usually the case when taking baths), IF the...

Would this work then? The return from the PHE doesn't go back to the bottom of the tank, but goes to the return on the boiler instead, so, when the boiler and its circulator pump is firing, the cold return from the PHE is 'sucked' through the boiler and back to the top of the tank, and no mixing...

I'm going to heat the tank 'directly' (I'm going to cut 2 new flanges into it, making the coil redundant, and getting the full 24kw heating as opposed to just 4kw). Is there a way to make sure I won't run out of hot water as long as the boiler is replenishing the tank at the same time? Do I need...

Oh I get it, makes sense, so, you store water at a moderately higher temperature than you need it, and fit a TMV with a set maximum temperature for the DHW, so that, as the stored water cools down, it's still hot enough to provide DHW without you noticing the drop in temperature. I'll do this...

thanks Simon, I worked out I need a 100kw capacity. I'm thinking I won't fit a TMV, seems pointless to me when you can just adjust the temperature on the cylinder stat to get the right hot water temperature instead, is that practical, or will it just mean that if the flow rate is low, Ill get...

Hi Simon, I'm resurrecting this post from a while ago, finally got around to doing this. I was just wondering, with a 24kw boiler and 900x450 cylinder store, can you recommend a good size plate heat exchanger please? 12, 15, 20 plates? 50kw, 100kw? I want to be able to run 2 showers at the same...