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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
  • 5002 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

Newcomer
October 20, 2022

HI yes the water is heated in a hot water cylinder, no problem with the old system,  2 years now.

 

Rank 2
October 20, 2022

Hi @Chip370 

I'm going to send the bat signal out to @James_N and @timtoos in the first instance as I think they have an Ecodan from memory.

I assume the water is heated via a hot water cylinder rather than any other means? When was the heat pump installed? Did you change the cylinder when the new system was put in? I assume you didn't have issues ith your previous heating system?

 

 

Hi,

Our system was a new installation in a new house so there was no previous system to remove. 

Yes, the ASHP heats the hot water in a cylinder.

Are you thinking of changing an existing system to use ASHP/GSHP?

Hope this helps.

Thanks

Jeffus
Rank 20
Rank 20
October 20, 2022

HI yes the water is heated in a hot water cylinder, no problem with the old system,  2 years now.

 

1. Was it a new cylinder when the ashp was installed ? 

2.Any new pipes from the cylinder to the taps?

3 Is the cylinder in the same place as the old cylinder

4. Is there any difference with the tap closest to the cylinder?

5. Did you notice any difference in the pressure of the hot water when the new cylinder was put in?

6. Are the pipes insulated between the boiler and the taps?

7. What temperature is your hot water set to?

8. Do you know the make and model of the cylinder? 

Rank 2
October 21, 2022

The government and many energy-aware bodies recommend a move to Heat Pump technology, especially in new-builds. It is generally accepted that the most efficient of these is the Ground Source Heat Pump. 
I have taken the recommended step and installed a GSHP in my new build. This was 12 years ago and I do not regret the decision. My GSHP ideally benefits from  3 periods of “reduced rate”  electricity supply, and this I obtained from the Economy 10 Tariff.

HOWEVER
Economy 10 availability seems to be reducing - with nothing replacing it to support the increasing demand from heat pump users. This is compounded by lack of Smart Meter availability for these users.

Does OVO have words of encouragement for those of us who seem to be doing the “right thing” but finding fewer suppliers able to supply our energy supply needs..

Hoping for some encouragement….


I

Newcomer
October 23, 2022

After much deliberation, I finally decided to get a heat pump installed for my hot water needs. The other alternative was a gas geyser, however i decided i did not want to be reliant on gas for hot water. Having a 5.4kw unit put in. I want to gauge its performance with winter on its way, and if it is inline with expectation, i plan on moving it onto essential loads. My pv system should have enough power to run it during the day. After discussing with the supplier, the representative suggested that the smaller 3.6kw unit would be a better fit for my current reality and expectation, i opted for the bigger size though for the incase factor.. ie.. in case i decide i want a second geyser hooker up..  or in case in the future i upscale from 150l to 200l etc.. That and given the math.. power wise it should use about the same power regardless. It should have a nominal power draw of some 1300w, so hopefully i see a material difference in electricity useage. Will post some results in 2 months odd time when the useage cycles cycle through

Emmanuelle_OVO
Retired Moderator
Retired Moderator
October 24, 2022

Hey @Old Timer,

 

Welcome to the OVO Online Community.

 

That’s amazing to hear you’ve had a heat pump installed.

 

Unfortunately, OVO currently only offer Economy 7 Tariffs. If you moved over with a smart meter as Economy 10, it would be automatically changed to Economy 7 times. The truth is the manufacturing of Economy 10 meters is becoming rarer. Hopefully the energy market comes up with similar schemes or incentives in future. I agree it’s beneficial for the planet to financially reward customers who are investing in green tech. 

 

Have you heard of OVO Power Move? OVO are rewarding customers for shifting their energy use to greener parts of the day! 

 

We have lots of interesting discussions on the Forum about heat pumps and your knowledge could really help other customers:

 

 

 

We also have similar threads relating to the issue you’ve raised:

 

 

Hope this helps. 

Renewable Energy? Big Fan.
Tim_OVO
OVO Staff
OVO Forum Legend
October 25, 2022

@vokar you’ve taken the heat-pump plunge, and you’ve joined an illustrious group of OVO Forum heat pump early adopters. 

 

Any questions around the installations, the settings, the efficiency, I’m sure there’s someone here who can offer some advice. Keep us updated! 

Carbon neutral - we need a community to get there! My green tech: Aclara SGM 1411-B smart meter, Chameleon IHD6
Newcomer
November 1, 2022

HI yes the water is heated in a hot water cylinder, no problem with the old system,  2 years now.

 

1. Was it a new cylinder when the ashp was installed ?  YES

2.Any new pipes from the cylinder to the taps?  NO

3 Is the cylinder in the same place as the old cylinder YES 

4. Is there any difference with the tap closest to the cylinder? NO   ALL NEED TO RUN AT FULL BLAST TO GET THE HOT WATER , lived here 50 years and had never been a problem 

5. Did you notice any difference in the pressure of the hot water when the new cylinder was put in? YES VERY FAST NOW

6. Are the pipes insulated between the boiler and the taps? NOT SURE 

7. What temperature is your hot water set to? 50 

8. Do you know the make and model of the cylinder?  

The general feeling is to get a return valve to the kitchen tap. Or turn the stop valve down so water doesn’t enter the house so fast

if I turn on the tap before the kitchen sink then the water heats faster , same if I turn the shower on before bathroom sink heats faster 

this is such a waste of water

thank you

juliamc
Rank 20
Rank 20
November 1, 2022

Is it to do with heat loss?  The old system heated your hot water to a much higher temp, so it needed less throughput to heat the pipes as it came through to your taps? Now you’re at 50 deg it needs more flow to heat up the pipe work and still be hot when it gets to the tap ? You could try lagging the pipes.

Newcomer
November 1, 2022

There is no problem With the actually heat at the tap I just have to have it on at full

blast to get the hot water there and as it flows so fast it splashes everywhere