More heat pump stuff

Here’s another one for all the heat pump cynics.

I can’t do an exact date-wise like-for-like comparison with my old house at Plazac and my new house because the former’s billing ran from mid-September to mid-November (2020) and my new house’s will be running from end October to end December 2023. However, I can make some very accurate estimates.

Here are the actual units consumed for two periods for my old house.

19/11/20 – 18/01/21: 1771 units
19/09/20 – 18/11/20: 1557 units

A good assumption is that the units consumed 19/10/20 – 18/12/20 will be the average of the above: 1664 units

My new house has a smart meter and exact figures are therefore available.

29/10/23 – 18/12/23: 636 units
Estimated 29/10/23 – 28/12/23: 763 units

763 units for the new house is 46% of the figure for the old (1664) and this at a time when the major demand has been for heating and the house has been toasty warm the whole time with the indoor temperature never falling below 22 degrees C day or night.

My old house (a poorly unsulated converted barn) was never uniformly warm and although I had background heating using electric convector heaters, the main source of heating was my wood burner. Obviously the cost for this was over and above the cost of electricity which was only used for lighting, oven cooking, hot water and running household appliances.

The figure for my new house is for everything – lighting, heating, cooking, the lot.

These are the numbers for energy input and output since installation.

Electricity input: 387 kWh
Energy output: 1607 kWh
Ratio: 4.15

So the heat pump is delivering over 4 times the amount of energy required to run it, which I find astounding. The numbers speak for themselves and it goes without saying that I am delighted with how the system is working 😀