Heat pumps are practical and necessary | Letters

Readers respond to letters from readers who were sceptical about the practicality of replacing gas boilers with heat pumps

Your correspondents are too gloomy about heat pumps for houses and flats (Letters, 20 October). Heat pumps may be unusual in Britain, but they are a major industry and very widespread in Europe and elsewhere. They are used in Canada, where outside temperatures drop very low. Individual units may not be suitable for high-rise blocks – although they might be installed on balconies. But high-rise buildings make up a small fraction of the housing stock, and blocks can have communal heating and cooling with large centralised heat pumps.

Older heat pumps were noisy, but new makes are on the market that are much quieter. It is not true, except in the worst cases, that installing heat pumps requires dwellings to be insulated first. The great majority of houses and flats in the UK are already reasonably insulated, and heat pumps can be run for longer and at lower temperatures than gas boilers. Better insulation of existing gas-heated houses and flats will by itself only produce modest cuts in carbon emissions. To meet climate goals, we have to stop using gas.

And, by the way, hydrogen as a domestic fuel – being pressed hard by the gas companies – is a distraction. It has to be made either from natural gas, which produces CO2 and can also release methane, a much more powerful greenhouse gas. Or it can be made with electricity, by the electrolysis of water. But why would one not in that case supply the electricity direct to houses, for resistance heating, or for powering heat pumps?
Philip Steadman
UCL Energy Institute

• Your correspondents who express reservations about heat pumps show no sign of ever having operated one. We have, since 2016, and it’s been one of the best things we ever did. Why? 1) Savings on the previous solid fuel system are around £800 per year. 2) Any sound is inaudible from within the house. 3) The system has coped effortlessly with -10C, which is hardly surprising given that it’s a Swedish model geared up to much lower temperatures than that. 4) It has proved totally reliable and fault-free. What’s not to like?
Paul Houghton
Towcester, Northamptonshire

• In response to readers sceptical of the government’s plans to replace our polluting gas boilers with heat pumps, there are some myths that urgently need debunking. Heat pumps already work in freezing Scandinavian winters, and they can certainly work well in flats. No working boilers will be ripped out, but replaced when they break with something cleaner and better for energy bills.

The UN secretary general has sounded a “code red” for humanity, and heat pumps are the only viable solution for clean, energy-efficient heating that can address the 14% of UK climate emissions coming directly from our homes. Green hydrogen will be so limited in supply for the foreseeable future that it must be preserved for hard-to-electrify sectors such as steel.

To roll out heat pumps at the speed and scale required to limit the impacts of the climate crisis, the time for public investment to kickstart private investment is now or never. Yet funding announced this week will only support 0.3% of homes to choose a heat pump, with no support offered to most households for the necessary insulation and no additional support for low-income families.

The government is right to recognise that pumps are the future of clean heating, but the chancellor must deliver the full £12bn of funds needed to heat our homes efficiently, cleanly and fairly in next week’s spending review.
Caroline Jones

• Unlike your letter-writer Gary Bennett, we didn’t just “search online”, we actually installed an air source pump, and it works brilliantly. We invested my retirement money not only in a pump but also the necessary insulation, underfloor heating and solar panels. The result is that we are paid for the excess electricity we now generate. If it was compulsory for every new house to have such a setup and proper grants were made available for older houses we might actually start to reach the targets set and see substantial financial returns by the end of the decade.
Stephen Dorril
Holmfirth, West Yorkshire

• Miles Brignall gives a useful summary of the costs of installing and running air source heat pumps (October 23), though there isn’t sufficient quantification: not many kWh in sight. But the practical difficulties and potential for higher running costs is well made.

Brignall also refers to the possibility of using hydrogen as a domestic fuel, saying: “Hydrogen is the other great hope. Trials and schemes are testing whether the highly flammable element can be used safely.”

It would be useful for us all to remember that we have a century and a half’s experience of making, storing, distributing and using town gas: a hydrogen-rich mixture made by heat-treating coal, sometimes with steam. It was sufficiently well known to feature in the chemistry syllabus for A-level when I took the exam in 1963. The problems with hydrogen are largely about having enough zero-carbon electricity to make it cleanly by electrolysis of water.

Which raises another point. Even with projected efficiency improvements, moving the UK from fossils to electricity for cars and domestic heating (whether by heat pumps or hydrogen) will require a very high electricity generating capacity without burning coal, oil or natural gas, and also a huge energy storage capacity. This challenging aspect of going green is ignored in popular treatments, and gets insufficient attention in policy documents. The intermittency of solar and wind systems is well known, and other “zero-carbon” generation systems like carbon capture and storage are untested at scale. It is difficult to see how a robust and resilient carbon-free electricity can be achieved without new nuclear generators.
Chris Adams
Berwyn, Denbighshire

Have an opinion on anything you’ve read in the Guardian today? Please email us your letter and it will be considered for publication.


The GuardianTramp

Related Content

Article image
Tackle fuel poverty and the climate crisis | Letter
Letter: The government needs to stop subsidising high-carbon heating and use the extra revenue to support low-income homes, writes Libby Peake of the Green Alliance


11, Oct, 2020 @3:14 PM

Article image
Industrial landscape should be protected | Letters
Letters: Donal Boyle says Historic England must preserve some of the country’s cooling towers; while David Smythe says there is no justification for fracking in the UK


31, Jan, 2018 @6:05 PM

Article image
Gas strategy in the UK is wrongheaded | Letters
Letters: It is no surprise that the government’s strategy on fracking has been deemed unlawful, write Robin Russell-Jones and Geraint Davies. Carbon emissions will be even lower if the gas boiler is run on hydrogen gas, writes Carl Arntzen. And Stephen Martin and Stephen Sterling say wealth redistribution is needed to reduce global warming


11, Mar, 2019 @6:15 PM

Article image
Green gas and the question of digestion | Letters
Letters: Simon Richards says the science behind green gas manufacture is straightforward, we just need a government with guts. ffinlo Costain thinks energy companies should be more upfront


29, Apr, 2019 @4:57 PM

Article image
Fight the power of the frackers by changing energy supplier | Letters
Letters: Howard Hardman suggests dumping the big six to stop the drilling; Austen Lynch says Lancashire’s fracking wells won’t provide much of an energy dividend; Neil Anderson on France’s tidal power station success


06, Apr, 2018 @3:37 PM

Article image
This energy price crisis could have been avoided | Letters
Letters: Readers respond to the rapidly rising costs of gas and the search for alternative fuels


21, Sep, 2021 @3:47 PM

Article image
What are heat pumps and why is the UK government pushing them?
Their use could help the UK meet its climate targets, but there are concerns over high installation and running costs

Jillian Ambrose

19, Oct, 2021 @10:46 AM

Article image
UK’s home gas boilers emit twice as much CO2 as all power stations – study
Data highlights urgent need for government action to introduce low-carbon heat pumps, researchers say

Damian Carrington Environment editor

29, Sep, 2021 @5:00 AM

Article image
Minister hints at gas boilers ban but says market should drive change
Anne-Marie Trevelyan urges firms to encourage shift to heat pumps, amid criticism of limited £5,000 grants

Jessica Elgot Chief political correspondent

19, Oct, 2021 @8:38 AM

Article image
UK energy dependence – five hidden costs expose truth about fracking
The shale boom is a bubble waiting to burst as the economics of extraction falter and the trickle of bad environmental news turns into a flood

Jeremy Leggett

18, Aug, 2014 @11:07 AM