I recently purchased the aquafficient water heater from Fisher Future Heat UK Ltd which was fitted in my bathroom on the top floor of my terraced house. The 2 fitters removed my old immersion heater & took it away, it is lovely to have hot water & not have to rely on my timer (which is now redundant), I also have more room in my airing cupboard, although the unit was quite expensive it has a 10 year guarantee, the only downside for me is the airing cupboard is not as warm as with the old immersion heater. I would definitely recommend one of these for anyone who is in the same position as I was. MG Kendal, Cumbria