chris47

I appreciate that the overnight power draw is not wasted but is heating the DHW tank, but my concern is the relatively 'short cycling' damaging the CoP and/or compressor life.

I'll try to find the route to controlllng the frost stat temp settings I discovered by accident.

The Honeywell wireless thermostat was part of the AWHP installation

HW schedule: 06:00 to 07:00 13:00 to 16:00 22:00 to 00:00 As can be seen above, the overnight power draws are when DHW demand is OFF

Can't it be disconnected via LG control panel on HW tank?

Not without staying up all night:) I'll give it a try tonight

I'm in Bristol (South West)

There is a a buffer tank between AWHP and emitters, built into the base of the HW tank but no IH is installed there. Yes, this is my first winter

Thanks for your comments JohnMo My house is well insulated (EPC high C rating) so heat loss is low; however, the thermostat schedule is OFF until 05:00 but the power draw is much earlier. My AWHP was only installed in April 2025 so my installer stated there is no historical data yet. He will setup weather compensation after 1 year's running.

Thanks for your comments JamesPa There is a a buffer tank between AWHP and emitters, built into the base of the HW tank but no IH is installed there

Thanks for your comments ProDave The Shelly EM GEN3 monitors the AWHP (LG Therma V AWHP on right hand side of Shelley app). The power draws are 1.5-2kW approx, far larger than a circulating pump would draw. There is an adjustable frost protection routine but it's not well documented but whatever I set it to doesn't appear to make any difference to the timing of the power draw. There is no immersion boost heater installed in the buffer tank as installers state they don't fit them in UK installations because our climate is not cold enough. The LG installation manual is not well written but my thinking is that there is a low power immersion heater (IH) fitted inside the LG AWHP monobloc cabinet. This IH is switching on, at approx hourly intervals, as a frost protection measure. The legonella IH is fitted but have switched it off, so the power draw is not due to this. On the give energy graph dated 11/9/25, the power draws between 00:00 & 02:30 are typical of an inverted (modulating) AWHP compressor draw. Between 02:30 & 04:40 the power draws are more like an IH. I wonder if it's worth contacting LG support?

Hi All Compare the 3 attached photos of my give energy & shelley apps; it shows these odd early morning power draws of my LG AWHP. The give energy photo dated 7/9/25 is what I expect & have seen over the last few months; the give energy photo dated 11/9/25 shows these weird spikes occurring every hour or so; the shelley photo shows overnight AWHP consumption of around 500Wh every hour throughout the night whci seems to tally with the give energy graph of 11/9/25 I've checked the CH schedule on the Honeywell Home room thermostat as follows: P1 starts at 05:00 - CH ON P2 ends at 16:00 - CH OFF P3 starts at 19:00 - CH ON P4 ends at 23:50 - CH OFF HW schedule: 06:00 to 07:00 13:00 to 16:00 22:00 to 00:00 The lowest temp last night (11/9/25) was 12°C between 03:00 & 06:00; any ideas about why this AWHP behaving like this would be appreciated.