Hi    Thank you for adding me.   We had a 11.5 Mitsubishi Ecodan ASHP fitted to a newbuild house in 2019.  We also have a neighbour newbuild with the same heat pump by 9 KW size.   Our first issue was that they are using in the 10s of units for their immersion, I understood this only kicked in when it did its salmonella? monthly thing.  Our heat pump is in the thousands so using much more than the neighbour, any suggestions to why.   In the last couple of