Hi, We are two weeks into the new house . Generally pretty happy but one or two issues arising. One is our Sunamp, a Uniq edual 9kw. This was bought to provide underfloor heating and hot water. We had hoped to use PV excess and top up with economy 7. Yesterday was very dull, though not overly cold, and we used the underfloor to raise the temp. from 16 to 19 degrees. We have the manifold mixing valve set at about 35 degrees. Basically, it struggled and eventually used all its capacity (indicated