January is when heating bills hit hardest. Homes are used more, days are shorter, and cold snaps push heating systems to their limits. For many UK households, this is the month when energy costs feel unmanageable.
At the same time, interest in alternatives to gas boilers is growing. Heat pumps lead the way. But many people are still unsure if they really save money.
This article uses real UK data on heat pump running costs. It explains why heat pumps can cost less than gas boilers. It shows how homeowners can start the year more efficiently. It also explains how to stay comfortable while saving energy.
Why January is the most expensive month for heating
January typically brings the highest heating demand of the year. Outdoor temperatures are at their lowest. Homes lose heat more quickly. Central heating systems often run longer each day.
Traditional gas boilers struggle with this pattern. They work by firing up at high temperatures, shutting off, then restarting again and again. This stop-start cycle reduces efficiency.
It is especially inefficient in older systems.
It also uses more gas when prices are hardest to manage.
According to Ofgem price cap data, heating accounts for over half of a typical household’s annual energy use. Most of that demand happens in winter months. January, in particular, exposes inefficiencies that might go unnoticed at other times of year.
This is why many homeowners look for ways to cut costs at the start of the year. Heating efficiency matters more now than ever.
Are heat pumps actually cheaper to run than gas boilers?
One of the biggest myths around heat pumps is that they are always more expensive to run because electricity costs more than gas. In reality, the answer is more nuanced — and increasingly positive.
A UK analysis by the Regulatory Assistance Project (RAP) found this.
An efficient heat pump could save the average household about £261 per year on heating.
This is compared with a gas boiler. In their comparison, a gas boiler cost about £984 per year to run.
A heat pump cost around £723 per year.
That is a saving of about 27%.
The key point is efficiency. While electricity costs more per unit than gas, heat pumps use fewer units of energy. They deliver the same amount of heat. When installed and set up correctly, this efficiency can outweigh the price difference.
It’s also important to be honest. Savings depend on insulation levels, system design, and energy tariffs. A poorly designed system will not deliver the same results as one sized and installed by specialists.
Understanding efficiency: why heat pumps use less energy overall
Gas boilers create heat by burning fuel. Even modern condensing boilers rarely exceed 90–92% efficiency, so they always lose some energy through the flue.
Heat pumps work differently. They move heat from outside to inside your home, rather than generating it from scratch. For each unit of electricity used, a heat pump can deliver 3 to 5 units of heat. This equals an efficiency of 300% to 500%.
This isn’t marketing hype. It’s measured using a Seasonal Coefficient of Performance (SCoP). This shows how a system performs across a full heating season, including winter.
Which? reports that a heat pump with a SCoP of 4.5 could cost as little as £379 per year to provide the same heat output that might cost £823 per year from a boiler.
This efficiency advantage is why heat pumps can compete with — and often beat — gas boilers on running costs, even in winter.
What significantly affects heat pump running costs in winter
Insulation and heat demand
The single biggest factor in winter running costs is how much heat your home needs to stay warm. Well-insulated homes lose heat more slowly, allowing heat pumps to run steadily and efficiently.
That said, a home doesn’t need to be “perfect” to benefit. Many UK homes, including older ones, can run a heat pump well with sensible upgrades.
These upgrades include loft insulation and draught reduction.
A proper heat loss calculation sizes the system correctly and prevents excessive electricity use during colder months.
Electricity tariffs and system setup
Energy tariffs also matter. Some households benefit from heat-pump-friendly or time-of-use tariffs. These tariffs lower running costs by reducing electricity prices at key times.
How the system is set up matters just as much. Engineers design heat pumps to provide steady, low-temperature heat rather than short bursts of very hot water. Systems that are set up correctly and matched to the home’s radiators or underfloor heating work better in winter.
This is where professional expertise makes a measurable difference.
Why heat pumps can feel cheaper even before the savings show
Many homeowners report that homes heated by heat pumps feel warmer and more consistent, even at lower thermostat settings. This is because rooms stay at a stable temperature instead of cooling between boiler cycles.
Over time, this often leads to behavioural savings too. When heating feels comfortable, people are less likely to keep turning the thermostat up and down. This is a common cause of wasted energy with gas boilers.
A maintenance benefit also exists. Heat pumps have fewer moving parts than boilers, which can mean fewer breakdowns and more predictable costs over their lifetime.
Start the year efficiently with expert advice
January is the perfect time to take control of your heating costs. While no system suits every home, UK data shows that heat pumps can cost less to run. This can be true even in winter. This is most likely when they are designed, installed, and set up properly.
At Adlår Castra UK, we specialise in expertly designed air source heat pump systems tailored to real UK homes. Our team carries out detailed heat loss calculations, ensures systems are sized correctly, and helps homeowners understand realistic running costs before making the switch.
If you want to start the year efficiently and find out whether a heat pump could reduce your heating bills, our specialists are here to help.
