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Currently we have a house UFH and summer house UFH operating as a single zone. But the summer house heating is pretty rubbish, so use an electric heater also. Now the temps are dropping the electric heater is starting to run through electric. to heat the summer house twice over the last couple of days and used around 14kWh. It is only going to get worse as temperature drop, becuase the the summer house is being used most days. So issues are, I need two very different flow temperatures, one for summer house and a much lower one for the house, the heating season for the summer house is much longer also. So need to make two zones. Since decommissioning the gas boiler, I have an Alpha Flowsmart 50L cylinder (previously used for combi boiler preheating), so will repurpose as a buffer, plumbed as a parallel, 2 port configuration across the supply and returns. Will follow the recommendation of Kensa heat pumps complete with PRV (by-pass valve) to engage the buffer only when needed. Also in my parts store is an ESBE CUA100 (cheap off eBay a while ago). This is an electronic mixer valve, that can be operated in either of two modes, fixed flow temperature or a modulating flow temperature based on house temperature. It incorporates a timer which works in both modes and allows a second temperature to be set. So in theory you can increase the temperature (either house temperature or flow temp) during E7 and lower at other times. So will install this and a pump on the house UFH. The summer house will be run on weather compensation, direct from the ASHP. CUA100_en_F_LR.pdf Just waiting for a new mixer valve to arrive. Controller is installed and everything seems to work, as it should. Have put the controller in the lounge using now defunct thermostat wiring and will use this room as a reference temperature. Will run on house temp mode first to see how it goes. If it not stable, its just a setting change to switch mode.