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HI Everyone, I have a large 3 bed 2nd floor flat which cannot have gas. I had it refurbished 3 years ago. I took the decision rightly or wrongly to install water piped underfloor heating with a 14.4Kw electric boiler. Sadly I did not project manage the job and the builders were not good at all. They never checked the floor levels before they installed the underfloor heating, and ended up cheating in two of the largest rooms by pouring latex over the top of the heating to get rid of the undulations in the floor. They have since gone bust:-( My issue is the heating is so expensive to run. I am facing an annual electric bill of £8000 or more now, and that is with the cheapest supplier I can find. So I am looking at all of my options to try and reduce the cost. I know I can improve the insulation in the apartment, as there are a lot of cavities around the walls, as being top floor I have vaulted ceilings in every room. Whilst the loft is fully insulated, the purchase of a thermal imaging camera as shown that there are big areas around the sides of most rooms which could not be as easily accessed, and were left by my lovely builders. But insulation aside, I need to try and find a more energy efficient way to heat my home as this is killing me I have considered a heat pump boiler, but I do not believe I would be allowed to install the outside unit here as being a block of flats, putting anything outside is a no go. I have spoken to a heat pump installer who has informed me that the unit cannot be installed in a loft, even if I created a well ventilated area, as it still will not be enough air circulation etc. The boiler I have is slimJim (see link below), I am wondering whether there are other more efficient electric boilers out there, or are they pretty much the same? I am really struggling to think of any other options tbh, and wondered whether any of you guys who are much more knowledgeable might be able to help. I might freeze next winter if not!!! https://www.electric-heatingcompany.co.uk/electric-boilers/slimjim-electic-boilers/?gclid=CjwKCAiAyPyQBhB6EiwAFUuakt2EDYDZtRTPhzZ3ym_crE4Lz4C9swJ_SAN-VDW_ae9Li3hxhRprCBoCorUQAvD_BwE