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I have recently had a Daikin Altherma 7.5Kw heat pump installed in place of a bosch gas boiler. The downstairs is UFH with 8 zones and auto balancing flow controllers. The upstairs is radiators with individually controlled radiator valves (TADO). There is an ESBE valve which controls whether the tank gets the hot water or the two heating circuits (2 x 2 port valves). The UFH and DHW work as expected and I've been getting a COP of 3.5 (heating / DHW). As the weather has been mild the upstairs of the house has required little or no heat and hence not paid any real attention to it. Tonight was quite cold so I turned on a couple of radiators. Which got to a reasonable temperature - enough to warm the room. After about 10 minutes the flow and return temperature converged and the flow rate dropped. The flow rate dropped to zero and essentially there was no more heating. I will be ringing the installer tomorrow but would like to have an understanding why this has happened. Looking back this is probably not an isolated occurrence. I should add that the reason for individual controls is that it is extremely easy to overheat the rooms given the level of insulation.
