Heat Pumps: Myth Busting
The Nine Biggest Heat Pump Myths and What's Actually True
Heat pumps are now the default low-carbon heating choice for UK homes, yet a surprising amount of what people hear about them is wrong. With many years of experience installing heating systems across the UK, including some of the country's largest social housing retrofits, we've heard every concern. Here's our honest take on the nine myths that come up most.
Why this matters now
If you've been weighing up whether to swap a gas, oil or LPG boiler for a heat pump, you've almost certainly come across conflicting information. A neighbour says they're brilliant. A friend's friend swears theirs never warms the house up. A newspaper column calls them a national mistake. A YouTuber rants about them for extra subscribers. The Government, meanwhile, is steadily rolling them out as the centrepiece of the Warm Homes Plan and the upcoming Future Homes Standard.
The truth sits well clear of all that noise. Heat pumps are a mature, well-understood technology. They have been the dominant form of home heating across Scandinavia for decades, but their UK story is still relatively new, which means a lot of the loudest opinions are based on early-generation kit, poor installations, a fear of change, or simply repeated hearsay.
We install and maintain hundreds of systems a year. We see what works, what goes wrong, and why. The list below is the result of those conversations. Let's run through a few of the popular myths, and we'll give you a truthful guide on heat pumps.
"Heat pumps don't work when it's cold."
This is the single most stubborn myth, and it falls apart the moment you look at where heat pumps are most popular. Norway, Sweden and Finland, countries where -20°C is a normal winter night, have the highest per-household uptake in the world. Modern air source heat pumps continue to operate efficiently at temperatures well below freezing; the lowest UK winter temperatures are nowhere near the limits of the technology.
What is true: a heat pump's output is steadier and lower than a gas boiler's, so a properly designed system relies on running for longer at a gentler temperature rather than blasting heat in short bursts. That's a comfort difference, not a capability difference.
"They only work in new-builds with perfect insulation."
Heat pumps work in a huge range of UK property types, including Victorian terraces, post-war semis and rural off-grid homes. The Boiler Upgrade Scheme was specifically designed for existing homes; that's the whole point of it. Insulation does matter because a leakier home costs more to heat with even a traditional heat source. CCS takes a whole-house retrofit approach, and with intelligent planning, we link measures together to create an efficient system.
"They're noisy."
Older units could be intrusive. Modern ones aren't. A current air source heat pump runs at roughly 40–60 dB at one metre, about the level of a fridge. Position it sensibly, and you'll mostly forget it's there.
"They'll cost a fortune to run."
Running costs depend on three key factors: system efficiency, how well the home retains heat, and the electricity tariffs.
A properly planned retrofit ensures all measures work together, allowing the system to run steadily and maintain a consistent, comfortable temperature. A well-installed heat pump typically produces three to four units of heat for every unit of electricity used, and that efficiency is what closes, and often beats, the gap with gas.
Used as intended, maintaining a steady background temperature rather than switching on and off for a blast of heat every so often, most correctly sized systems deliver running costs that are comparable to, or lower than, a gas boiler and the constant temperature that is maintained means a home that is always comfortable and warm. Homes switching from oil or LPG almost always see a significant saving.
"You have to rip out every radiator and put in underfloor heating."
No. Heat pumps run at lower flow temperatures (typically around 45–55°C versus 70°C+ for older boilers), so some radiators may need upsizing to release the same amount of heat into the room. It is rarely a wholesale replacement. In many homes already fitted with reasonably sized radiators, no changes are required at all. A competent design survey will tell you which rooms, if any, need attention.
"Heat pumps are harder to maintain and keep compliant than gas boilers."
Gas boilers come with well-understood compliance and maintenance obligations. Heat pumps are a newer technology, so the maintenance requirements can sometimes feel less certain. In reality, the process is often simpler.
With no combustion and no flue, annual servicing is generally more straightforward. When properly maintained, a heat pump system will also typically outlast a gas boiler by five years or more.
Correct Contract Services provides the expertise, planning, and ongoing support needed to keep heat pumps running efficiently for many years.
"They can't produce hot water hot enough for a proper shower."
They can, and they do. Domestic hot water is stored in a cylinder and typically held at 45–50°C, with periodic boosts to higher temperatures for legionella protection. Performance is comparable to a stored hot water system on a regular gas boiler. The genuine difference is that heat pumps suit a steady, planned hot water schedule rather than an instant on-demand combi-boiler approach, something that CCS walk every customer through during handover.
"They're not really greener. The grid still runs on gas."
The UK grid still uses some gas, but its carbon intensity has fallen dramatically. Even on the current grid mix, a heat pump installed today produces materially lower carbon emissions over its lifetime than a new gas boiler, and the gap widens every year as more renewables come online. If you also have, or plan to add, solar PV, the carbon and cost case becomes stronger still.
"It's too early to switch. The technology will get better."
It already has. Heat pumps available in 2026 are quieter, more efficient and easier to install than units sold even five years ago. Waiting indefinitely costs you money in fossil fuel running costs, locks in carbon emissions, and risks missing out on the grants and schemes currently available. The technology is mature, the supply chain is established, and the support is in place.
So how do CCS get this right?
Almost every heat pump horror story comes back to the same root cause: a poor design and a rushed installation. The kit is rarely the problem. A correctly sized, properly commissioned system, set up to run continuously at modest temperatures and matched to a thoughtful control strategy, will keep a UK home comfortable through any winter we're likely to see.
That means choosing an installer who:
- Carries out a full room-by-room heat-loss calculation, not a back-of-envelope estimate.
- Is MCS certified and a member of an approved consumer code.
- Spends time at handover explaining how to live with the system, controls, hot water schedule, summer settings.
- Stays available for service and support after the install is complete.
About Correct Contract Services
CCS has been installing and maintaining electrical, heating, hot water and renewable energy systems across the UK since 2007. We deliver whole-house retrofit, planned maintenance and 24/7 emergency support for social housing providers and local authorities.
