Air Source Heat Pump - how much should I expect to pay on energy bills?

QrizB

@Reed_Richards has exactly that and can tell you how it works out for him.

Reed_Richards

Solar PV panels work very badly with a heat pump.  They provide lots of electricity in the middle of the day in summer when you don't need any heat and far far less in the middle of winter when you do.  If you try to use them to power your heat pump for hot water in summer then you will find that the heat pump will draw more power than they can provide (most likely).  People without solar panels tend to underestimate how much more and stronger sunshine we get in summer but if you ask yourself "Why is summer hot and winter cold?" you may get the idea.

Even on a sunny day in January my heat pump tends to run in power cycles so if it were not for my battery I still would not be able to use all of what little solar power I get.  By all means get solar if you want it but don't think that because you have a heat pump you will get a significantly better ROI from the panels.        

shinytop

Damob123 said:

Reed_Richards said:

SCOP = Seasonal Coefficient of Performance
This means that averaged over a year (all four seasons) you would expect to achieve 3.65 kW of heat for every 1 kW of electricity.

Makes sense - thanks! However, is that not abit contradictory of our estimated heat usage vs our actual usage?

So we've got an estimated heat usage (space and water) of roughly 13,000 kWh and our actual usage over the last year is roughly 6,500 kWh. So actually our SCOP is 2.0?

Sorry if it's a daft question, I'm just trying to get my head around it.

Some good answers already.  You can get the energy numbers from the Ecodan control panel very easily. The most basic monitoring should record energy consumed and delivered and you can work out the COP.  Press the F4 button on the panel a few times and you'll see it. 

Although it sounds like you're doing OK, It's often the case that there are better ways to run an ASHP than the one the installer tells you.  Let me know if you want any more details.   

I have an Ecodan in a medium sized 4 bed 1990 bungalow and December cost me about 750kWh/£150 to heat all of it to 20-21C. A really cold day costs £10 or more though so it could  get worse.

Flight3287462

We have a small detached three bedroom house with GSHP and expect my electricity usage to be around 9,500KWh per annum.  You look to be doing OK.

Damob123

Thanks everyone for the discussion - I've found it really useful. I think I'll sit on my current tariff given the climate at the moment.