This is our experience, in total:   We fitted a Sunamp PV, a very early pre-production unit, in 2015.  It had a few teething problems, but after about three months it worked flawlessly until we chose to swap it for a new Sunamp UniQ 9 kWh unit in October 2018.    The Sunamp UniQ was essentially unfit for purpose from the day we received it.  It failed to provide hot water several times, Sunamp were less than helpful and the only way I managed to get the thing to work was to r