Damien Hilton considers the promise and the pitfalls
In the race to reduce household carbon emissions, heat pumps are being championed as a cornerstone of the UK’s net zero future. According to The Guardian (April 10, 2025), gas boilers still outnumber air source heat pumps in UK homes by a ratio of 15 to 1—but that gap is expected to narrow, thanks to new incentives and relaxed planning rules that make heat pump installations easier than ever.
But are they right for every home—especially in densely packed parts of North London like Tufnell Park? The answer, as always with heating systems, depends on the details.
Why Heat Pumps Matter
Unlike gas boilers, heat pumps don’t burn fossil fuels. Instead, they extract heat from the air (or ground), compress it, and use it to warm your home. They’re remarkably efficient, often delivering three units of heat for every unit of electricity consumed.
The environmental benefits are clear: significantly lower carbon emissions, and, when powered by renewable electricity, near-zero operating emissions. The UK government is currently offering £7,500 through the Boiler Upgrade Scheme to encourage households to make the switch.
But even with incentives, heat pumps require serious upfront investment. Air Source Heat Pumps typically cost between £8,000 and £15,000, while Ground Source Heat Pumps can run between £18,000 and £35,000, depending on your property and installation requirements.
The London Reality
While heat pumps may be an easy win in new builds or countryside homes, London’s older housing stock—Victorian terraces, converted flats, and post-war maisonettes—present significant hurdles.
“Space is often our biggest challenge,” says a Calidra engineer. “A standard air source unit needs around a metre of clearance and a stable external wall, which just isn’t feasible for a lot of homes in our area.”
Noise, aesthetics, and accessibility also play a role. In a compact garden or tight alleyway, the hum of a heat pump can disturb neighbours, and its visual presence can clash with heritage façades—especially in conservation areas.
Flats bring their own set of complications. Shared ownership, freeholder permissions, and infrastructure limitations mean most leaseholders face a long list of bureaucratic and physical barriers.
New 2025 Planning Rules: A Game Changer?
Previously, many London homeowners were dissuaded from installing heat pumps because of stringent planning regulations—especially the requirement that units be at least one metre from property boundaries. But as of 29 May 2025, the UK government has loosened these rules considerably:
- Boundary restrictions scrapped: Air Source Heat Pumps can now be installed closer to property lines, making them more feasible in tight urban spaces.
- Size limits increased: The allowable unit size has risen from 0.6m³ to 1.5m³ under permitted development, covering more powerful systems.
- Detached homes may install two units: Supporting larger properties or cascade systems.
- Air-to-air heat pumps now allowed: Permitted development rights now cover these dual heating and cooling systems.
- Noise regulations updated: All installations must comply with new MCS 020 noise standards.
These changes significantly lower the planning barrier—but they’re not a silver bullet. Listed buildings, conservation areas, and flats still face additional scrutiny. For many London homeowners, that means a conversation with the local planning authority is still a crucial early step.
Installation: It’s Not Plug-and-Play
While a boiler replacement can often be done in a day, a heat pump retrofit takes longer and can be more invasive. Older homes may need:
- Upgraded insulation to retain low-temperature heat
- Larger radiators or underfloor heating systems
- New hot water cylinders
That means some disruption and expense before the efficiency benefits kick in.
So Why Are People Still Choosing Gas?
It’s partly down to cost and convenience. Modern condensing boilers are relatively affordable, quick to install, and highly efficient. For many London homes—especially those that are already well-insulated and upgraded with smart controls—a new boiler still represents a sensible, low-hassle improvement.
That said, the writing is on the wall. The UK is moving away from fossil fuel heating. The government has announced plans to phase out new gas boiler installations in the coming years, and the industry is already preparing for a new future shaped by electricity, not gas.
When a Heat Pump Makes Sense
At Calidra, we’re seeing more homeowners come to us with questions rather than assumptions. They want to understand the full picture before making a long-term decision. And that’s exactly the right mindset.
If you’re considering switching to a heat pump, start by asking:
- Do I have outdoor space for an external unit?
- Is my home insulated well enough to benefit?
- Do I need to replace radiators or install underfloor heating?
- Do I live in a flat, listed building, or conservation area?
- Am I eligible for the Boiler Upgrade Scheme?
Final Word
There’s no one-size-fits-all answer when it comes to home heating. Heat pumps are an essential part of the path to net zero—but only when they’re installed in the right way, in the right homes.
For residents in places like Tufnell Park, the path forward may be more gradual: planning for the future, investing in insulation, and exploring low-carbon options with trusted local installers.
Whatever your next step is—boiler or heat pump—make it an informed one.
Damien Hilton is well known to many TPP members as both a plumber and heating engineer. He is Managing Director of the new north London companyCalidra Installations www.calidra.uk which works not just with boilers but also heat pumps and PV installations, the second of which can be connected to hot water tanks for cheaper hot water in summer.
