The primary reason I see for such a setup is to give heat in a long electricity cut, with a small generator or V2L to recharge the battery.
Yes it throws the numbers off, I would be intresting in the claim about the COP. No matter the outside temp between 0 and 7am I run the heat pump,
Ive tuned the flow temp as much as possible, the flow temp of the heat pump and boiler are equal. I run the system 24/7. With no setback. So I know this is the flow temp required, no matter the source to get the house to 21c downstairs, 21 in bathrooms and 18/19 in bedrooms.
The bus grant is a great point, I had a few issues with this
- Heat geeks would not touch the house, said heat loss was to high.
- I got quotes from 5 places and they all inflated the price, They also all quoted High temp units, or double units.
- To replace a oven with induction was look at £2000+. Plus I think we would have had to increase the supply as its already a double oven.
- Yeah with the USP supply we can keep the heating on.
- I did all the automation
- I also wondered about selling the house in the future, with a heat pump and a boiler that can both do 100% of the heating we are covered for all.
- It is nice when my daughers use all 300L of the hot water that we can recharge it quickly, nothing worse than catching a defrost during a full reheat.
When we are out of the heating season I am doing todo a few changes to the piping to see if we can get a bit more flow and reduce the flow temp a little bit
I just had a look at your system @matt-drummer
1h window, almost the same outside temp.
Your system 5.8 COP flow 29.4 6.6lpm and 2.49kWh of heating
My system. 4.6 COP flow 35.1 22.8 lpm and 8.157kWh of heating
I am not sure I could get the wife to agree to any bigger rads