>>I am surprised at how long some of you run your hot water heating each day.
Ours is on 24/7. When I've got a baseline trend I'll think about messing with it; the supplier of the system said to just leave it on all the time and use the thermostats to control the heating.
Until a few days ago I had all the room stats right down to ensure heating was effectively off. The heat pump has its own electric meter and with just hot water it has been using between 2 and 3 kWh per day which seems not too bad. HW is set at 50C and reheats when it drops to 42C.
I put the stats in two bathrooms, a bedroom and lounge up to 22 a few days ago when the temperature dropped. It put the consumption up to about 7kWh daily. Without adjusting stats and with a rise in outside temp it has dropped back to 4kWh yesterday.
I'll see what happens when we get in to some properly cold weather. Then I'll look into variable pricing if available and the possibility of running heating at low priced hours and not at the most expensive times. It's all underfloor, and particularly downstairs where we are heating about 100mm of screed it shouldn't really matter much just when the heat goes in.
We finished the loft insulation yesterday - I noticed that the eaves over the coldest bathroom had no insulation on the ceiling which probably explains something!
I can feel a few experiments coming on. At some point I will put all the air stats up to say 25, and then when its up to temperature turn them all off, and see where cools fastest. I can then add insulation above the upstairs rooms with the highest heat loss.
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