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Calling all owners of Samsung Gen6 ASHP (maybe others too). I have found on my system that when the exterior temperature drops to 2deg or below, if the pump is not working for heat/DHW, it enters a frost prevention programme where it runs the main circulation pump and operates the DHW valve. This means it is sucking heat out of your hot water tank to prevent the external unit getting the shivers. Quite why is the good question when mine and I suspect everyone's is filled with antifreeze protector. We've posed the query via our contractor to Samsung as the contractor is as puzzled as I am as to why it should do it. I discovered this by accident as I set the internal overnight temps back a degree or so at 22:00. One frosty night walking past the kit cupboard at 24:00ish I heard the circulation pump running and discovered this. On a fully cold night it takes around 8 to 10 degrees # out of the hot water tank (400l). I've now bypassed the DHW valve with a switch so it pulls it out of the buffer instead whilst we wait for Samsung to reply. Note the pump runs several times a night for around 5 mins a time. #We're passive insulated and EPC A, so room temps barely fall a degree overnight. It seems mad to me to have this put in the programme with no way to adjust it. If it could be set to only do when say the outside temperature falls towards the freeze point of your mix then fine, but otherwise this is just wasting heat.
