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dcawkwell I've rechecked all the stat settings and can't find anything wrong. The underfloor system does have a separate pump and blend valve and althogether it works really well - but the stat is non-TPI! ALEC etc I suppose to distill it down, the simple question whether TPI control is...

Exactly the problem I think. It calls for heating every 20mins because no significant heat has been produced in the meantime and hence the room temp has not shifted. The question is, will the 'learning function' on these stats eventually cope with this? By that I mean, if the response of my...

Thanks again. Yes, I have TRVs on 16 of the 20 rads with other 4 as bypasses. I have tried running the heat pump continuously (by setting a high target temp) and controlling as possible with the TRVs. This produces very high electricity consumption for the time of year (>50kWh per day). I...

Thanks. No we don't want temp fluctuations but if the cost of tighter control is that the heat pump is cycling frequently (with risks to long term reliability and noise from the pipe work each time it begins to very slowly heat up/cool down), then we would accept it. The reason the stat...

We have a Daikin Altherma HT heat pump system which drives one zone of underfloor heating and 2 zones of rads (upstairs and downstairs). This Daikin system has inverter driven pumps and compressors so can adapt somewhat to load and has weather compensation fitted and working. The u/f works...