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by michaelt 897 days ago
Well, sort of.

The thing is, heat pumps aren't a particularly good deal right now.

Heat pumps generally have less heat output than a gas boiler, so it won't make your house any warmer.

Even taking government subsidies into account, the installation costs are several times higher than a gas boiler, both for the unit and often requiring new radiators and suchlike.

And typical energy prices in the UK might be 6.5p/kWh for gas, 26.0p/kWh for electricity - so even if your heat pump achieves a 3.0 CoP your running costs are still higher. In the UK, the months when you'll want the most heating are the months when domestic solar output will be at its lowest. To make savings you've got to switch to a plan where electricity costs change several times a day, such as https://octopus.energy/smart/cosy-octopus/ and not run your heating between 16:00 - 19:00. This makes a well-insulated home even more important.

And you might think you're going to save money by not paying the gas supply 'standing charge' - but gas suppliers can charge whatever they like to remove your meter. If they say it's £1500 to remove your gas meter and save you 30p/day - you're probably not going to be saving 30p/day

So it's less a case of "investing" in the house, and more a case of "investing" in good karma by helping the environment.

2 comments

How much heat do you need? We've renovated a row house in the Netherlands - very similar climate - with solid foam insulation and triple glazing. Haven't gotten to installing a heating system yet. Even in the current cold period it's perfectly fine indoors with a cheap hoodie on. If I didn't know it would make the place unsaleable, I'd be tempted to move forward without any room heating system at all, only a small on-demand water heater.
The estimates in that terraced house's energy performance certificate [1] are 15,992 kWh per year for heating, 2,324 kWh per year for hot water.

Of course these figures depend on how much of the day the house is occupied, how high the thermostat is set, and how cold the weather is.

[1] https://find-energy-certificate.service.gov.uk/energy-certif...

(I have a heat pump)

You can get electricity at 7.5pkWh. With a battery, I get 12h of cheap electricity per day, and the rest at higher prices.

At the coldest time of the year, I'm getting an average of 20pkWh.

This is just a fraction above break even gas/electric.

The rest of the year its no contest, heat pump wins.

My energy usage for heating is down by 60% year on year

My bills are the same as they were 3 years ago.

Nice. Who's your supplier and what do you have to do to get those rates? The 6.5p/kWh for gas, 26.0p/kWh for electricity figures are from my Ovo bill for this month.
It's Intelligent Octopus Go.

You need a smart meter. It's electricity only.

You (and I) get £50 credit with this link: https://share.octopus.energy/happy-frog-559