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Abby_OVO
Community Manager
Community Manager
January 10, 2022
SHARE YOUR EXPERIENCE

Heat pumps - What’s your experience of the benefits and downsides to an ASHP?

  • January 10, 2022
  • 106 replies
  • 5000 views
Heat pumps - What’s your experience of the benefits and downsides to an ASHP?

Updated on 03/07/26 by Abby_OVO

 

Advantages and Disadvantages of Air-Source Heat Pumps (ASHPs) - Share your experience

 

As one of the leading options in our journey to decarbonising the way we heat our homes, Air Source Heat Pumps (ASHPs) are really heating up (pun intended) and generating much discussion, both amongst the AHSP trialists here on the OVO community and in this recent article written by our content team covering both the advantages and disadvantages of this low carbon heating set-up.

 

We know a lot of you here have gained first-hand experience of life with an ASHP in 2021 and we want to give you another chance to share your stories and help others considering an ASHP installation in 2022 and beyond!

 

 As the article outlines one of the main benefits of opting for this heating system over alternatives will be it’s green credentials:

 

“They don’t give off any nasty carbon emissions”

 

How important was this as a factor in making you decide on an Air-Source Heat Pump and how do you think the positive environmental impact could be supported?  

@nealmurphy@M.isterW  - be honest here: did reducing your home’s carbon footprint play a factor in your choice to go for a heat pump? 

 

We know, as with any new technology, there might be some misconceptions about ASHPs which could be putting off other potential adopters. Have you heard the one about how noisy heat pumps are?:

 

“They can make noise – but not as much as you might think”

 

We’ve ‘heard’ that the noise of an ASHP hasn’t been the issue you might have been led to believe before getting one installed - isn’t that right, @James_N and  @jason.lewis? Can you dispell this myth once and for all?!

Was this a concern you had before the installation and if so what put your mind at ease when giving the go ahead to the install?

What would you say to others who might be concerned by the noise factor? Are there times that the pump might be louder than others or is it a constant hum? 

 

Cost is always a major factor when making home improvements and could be the deciding factor for some. As the guide calls out, currently installation costs for ASHPs are much higher than for a standard gas boiler replacement:

 

“They’re more expensive to install than a boiler”

 

Whilst I know many of you here are participating in a trial so didn’t incur these installation costs, there may be other financial impacts to consider such as the ongoing running costs. This can be complicated to work out, but is essential information. @Gingernut49 and @hambrook - What advice would you give to someone trying to calculate the affordability of an ASHP over other options?

 

 

For those considering an ASHP in future there’s some positive news ahead:

 

“You can get some financial support for installing one”

 

We’ve also seen a few community members with ASHPs who aren’t part of any trials that OVO are involved in, and we want to hear from you on this one! @Heatherd@plodder@Sean T@Graham110011@Roy_and_Becky and @PNorman - Did you get any financial support towards your installation or running costs? Any top tips for someone thinking of applying for this now? 

 

 

“You’ll need proper insulation to get the best out of your heat pump”

 

This is another big and complex factor to consider when changing from a gas boiler to an ASHP. Pipe insulation is one thing, loft insulation is another and the overall heat retention properties of a house can impact the cost effectiveness. @hydrosam and @Transparent @hambrook - How can someone work out whether their house is suitable for an ASHP or what changes might be needed first? Better to get an expert in, or reaching for the thermal sensors?

 

@juliamc  we know you have first hand experience of some DIY insulation post-install: looking back, any tips you can share on how to go about this, or would you now advise the installer takes a lead? 

 

And what about radiator sizes? -  @sylm_2000  we know you had changes made: Share your overall lessons for someone unclear on whether their radiators are fit for purpose in an ASHP home of the future!

 

 

Potential heat pump owners, over to you!

 

As it’s usually the largest contributing factor in the carbon impact of a household, making such a radical change to the way we do things (over 85% of UK homes are currently heated by gas) will no doubt generate plenty of questions. We’re hopeful that by having honest and constructive communities (like this one!) on hand to de-mystify the process, this will give others the confidence to take the leap -  @Jeffus and @Gum168, we know you’re both eco-minded but yet to invest in an ASHP- Has participating in discussions here altered your view of heat pumps or encouraged you to learn more?

 

What would be the number one thing you’d want to know before making the ASHP journey? 

106 replies

Rank 4
January 12, 2022

@M.isterW has summed things up nicely. 

For me now running costs are comparable to when I had gas before but it took a change in mind set from heating the house on demand, to heating the house slowly but continuously. 

Is your house suitable? More houses than not are suitable I think is an initial opinion from this heat pump trial but, and it’s a big BUT, the systems HAVE to be installed well, my experience proves that. A reputable installer will work out whether a house is suitable and provide estimates of energy usage. If they don’t spend an hour or more calculating this before providing a quote then they are taking short cuts.

The industry needs to wake up to the poor installation standards seen in some examples before it ruins (perhaps unfairly) the reputation of heat pumps. 

But regardless of what type of heating system you have, do your best to insulate your property and reduce your energy wastage. It’s more apparent with heat pumps because the energy source is more expensive (currently) but the energy wastage is still there with gas, oil, lpg boilers, it’s just not noticed because the energy source is (currently) much cheaper. 

15kwh grid-tied battery, ASHP Daikin 11kw R410 mono + 300l Cylinder. 3.3kw Solar PV. Kia e-Niro EV
sylm_2000
Rank 2
Rank 2
January 12, 2022

Excellent forum discussion and real life experience indeed.

One thing your installer will likely discuss with you is efficiency and effectiveness of your home insulation. This may mean different things however if you’re using rads then it is likely they need to be upgraded (i.e. bigger!) to compensate for the extra heating surface required for the low water temperature for heat pump.

I would suggest plan for around £300 to £450 per rad incl installation excl the fancy designer ones in home magazines.

This is our first winter with ASHP and I can already see my electricity bill higher to my last year gas+elec monthly bill combined. Now, I am discounting the increased gas price which may favour the almost zero gas cost and much higher electricity cost. We are not yet in full winter yet so holding my calculations for now.

 

To net-zero and beyond!
M.isterW
Rank 6
Rank 6
January 13, 2022

I was bored so I worked out a cost comparison between Dec last year (gas heating) and Dec this year (heat pump). I'm going to put a bunch of caveats on this.…

1 - I only have average usage figures for Dec 21 as I didn't have a smart meter.

2 - We have a Phev so I've assumed we charged it the same amount both years.

3 - Our heat pump setup is a bit odd so some of our hot water comes from an immersion heater. That's increased the Dec 22 electricity use.

4 - I've calculated the usage and worked out the costs at Dec 22 prices.

 

Dec 21 - £166

Dec 22 - £177

I can't remember if Dec 21 was warmer or colder than Dec 22 but I think this shows that the running costs are comparable.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
nealmurphy
Newcomer
Newcomer
January 13, 2022

I can't remember if Dec 21 was warmer or colder than Dec 22 but I think this shows that the running costs are comparable.

If you can accurately predict the weather and energy prices for December 22 then I think lots of energy companies will be clamouring to give you a job! :grin:

M.isterW
Rank 6
Rank 6
January 13, 2022

I can't remember if Dec 21 was warmer or colder than Dec 22 but I think this shows that the running costs are comparable.

If you can accurately predict the weather and energy prices for December 22 then I think lots of energy companies will be clamouring to give you a job! :grin:

🤣

Well, I messed that up. Let's go for Dec 20 and Dec 21 😆

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
Jeffus
Rank 20
Rank 20
January 13, 2022

I can't remember if Dec 21 was warmer or colder than Dec 22 but I think this shows that the running costs are comparable.

If you can accurately predict the weather and energy prices for December 22 then I think lots of energy companies will be clamouring to give you a job! :grin:

🤣

Well, I messed that up. Let's go for Dec 20 and Dec 21 😆

From the met office website. There may be other organisations calculating different averages. 

UK mean temperature for Dec 2020 was 4.3 degrees they say

UK mean temperature for Dec 2021 was 5.3 degrees they say

Differences do vary by region. Also particularly cold times and wet days will have an impact i assume on heating costs 

​​​​​

Quite difficult to compare but non the less positive that for this particular home the heat pump setup isn't significantly more expensive in terms of running costs so far. 

If this is around the average increase in cost then i think that is positive. I am expecting the price cap review to increase gas prices more than electricity prices so the 2020 vs 2021 comparison may look very different. It sounds like the price cap will be announced around the 7th Feb ready for the change in April.

​​​​​https://www.metoffice.gov.uk/research/climate/maps-and-data/summaries/index

Jeffus
Rank 20
Rank 20
January 13, 2022

I was bored so I worked out a cost comparison between Dec last year (gas heating) and Dec this year (heat pump). I'm going to put a bunch of caveats on this.…

1 - I only have average usage figures for Dec 21 as I didn't have a smart meter.

2 - We have a Phev so I've assumed we charged it the same amount both years.

3 - Our heat pump setup is a bit odd so some of our hot water comes from an immersion heater. That's increased the Dec 22 electricity use.

4 - I've calculated the usage and worked out the costs at Dec 22 prices.

 

Dec 21 - £166

Dec 22 - £177

I can't remember if Dec 21 was warmer or colder than Dec 22 but I think this shows that the running costs are comparable.

Be curious to know the number of kWh for gas in December 2020 vs the number of kWh for electricity in December 2021

Are the numbers you quoted what you estimate just for heating and hot water? 

On my tariff the unit rate for electricity is 5.56 higher than gas but i doubt i will ever see that again 

Jess_OVO
OVO Staff
OVO Staff
January 13, 2022

Some really great points being raised here both by prospective AHSP owners and those just getting to grips with their new ASHP setups.

 

Just wanted to tag a new arrival to the community, @Adam Vetere - as they’ve also mentioned an upcoming heat pump installation. How do your pre-installation questions/concerns match up to what already been discussed here, @Adam Vetere?

 

Anything you’d like to ask those who have already been through the installation process? :slight_smile:

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Newcomer
January 13, 2022

At this time it is more expensive running a heat pump than the combined gas an electric a year ago. This maybe due to the complete lack of control we have being part of the Heat Pump trial and the system being controlled by someone else. If we were able to heat the batteries using cheap off peak electric or solar PV this might inverse the cost. The sunamp batteries seem to be inefficient for hot water, always relying on an immersion to get the hot water to a useable temp. We also have a major situation with where the heat pump was installed as it now blasts our outdoor deck area with ice cold air, it was not ‘allowed’ to be more than 10 meters from the house. 

 

Ecodan 14kw Heat Pump with 300L Joules Cylinder - 9 kWp Solar PV - 2x Tesla PowerWall 2 with Backup Gateway 2 - Tesla Model S 75D - MyEnergi Zappi & Eddi - Mixergy 250L
M.isterW
Rank 6
Rank 6
January 13, 2022

The comment from @hambrook demonstrates how important it is to get the specification and installation right. We have almost identical systems as we're both part of the same trial. Mine heats the house very well, is located down the side of the house and, despite some of the water being heated with an immersion heater, is  costing about the same to run as our old gas system.

 

 

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊