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  1. Steve W
    The question is simple, are some makes and models of ASHP more prone to frequent defrost cycles. I have had an ASHP (Daikin Altherma 7kW) fitted in October last year and it works well until you get the -2 to +5 temperatures with high humidity - recently humidity has been in the high 90s. Under the above conditions the unit was going into a defrost cycle every 25 minutes even at 9pm with an outside temperature of +2.5C. The interval between cycles is so little that the unit struggles to get to 35C before the next defrost. Essentially the average temperature is around 27C which doesn't make any impression on heating the house. As I have a mixture of UFH and rads the LWT is set to 45C. Hence the question are some units more prone to icing or are some units more prone that others.
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