If you are weighing up a new heating system, a heat pump running cost comparison is usually where the decision becomes real. The headline claim is simple: heat pumps can be cheaper to run than older electric, oil or LPG heating. But your actual bill depends on the type of property, the quality of installation, your insulation, and the tariff you are on.
For most households, the right question is not just, “Is a heat pump cheaper?” It is, “Cheaper than what, in my home, with my usage?” That is where a clear comparison helps.
Heat pump running cost comparison: what you are really comparing
A heat pump does not create heat in the same way as a boiler or electric heater. It moves heat from the air or ground into your home, which is why it can deliver more heat energy than the electricity it uses. That efficiency is the reason running costs can look attractive on paper.
In practice, you are usually comparing a heat pump against one of five common systems: mains petrol, oil, LPG, direct electric heating, or older electric storage heaters. For homes off the petrol grid, the savings case is often much stronger. For homes with a modern, efficient petrol boiler and relatively cheap petrol, the picture is more balanced.
That does not mean heat pumps are poor value in petrol-heated homes. It means the running cost comparison needs to be honest. Lower carbon, steadier heating and future-proofing all matter too, but they are not the same as immediate bill savings.
How heat pump running costs are worked out
The main figure that affects cost is efficiency. You may see this described as COP or SCOP. In plain terms, it is the amount of heat you get for each unit of electricity used.
If a heat pump operates with an average seasonal efficiency of 3, it produces 3 kWh of heat for every 1 kWh of electricity. If electricity costs 25p per kWh, the effective heat cost is roughly 8.3p per kWh. That is the number you compare with petrol, oil or direct electric heating.
This is why two homes with the same heat pump can have different bills. A well-designed system in a well-insulated home may run very efficiently. A poorly sized system in a draughty property may not.
Typical effective heat costs
As a simple guide, direct electric heating usually costs the most to run because 1 kWh of electricity gives you roughly 1 kWh of heat. A heat pump can reduce that cost significantly because it multiplies the useful heat output.
Petrol is often still competitive on day-to-day running costs, especially where a condensing boiler is working well. Oil and LPG tend to be more expensive and more volatile in price, which is why heat pumps often compare better in rural and off-grid properties.
Ground source heat pumps can sometimes be cheaper to run than air source systems because they work from a more stable ground temperature. However, the installation cost is usually much higher, so lower running costs do not automatically make them the better-value option overall.
Air source vs ground source
For most homes, an air source heat pump is the more practical route. It is usually cheaper to install, suits more properties, and is simpler to fit where outdoor space is limited. Running costs can be very good if the system is correctly matched to the home.
Ground source heat pumps can be highly efficient and steady in colder weather, but they need either trenches or boreholes. That makes them more suitable for larger plots or certain commercial sites where long-term performance matters more than upfront spend.
So if you are making a pure heat pump running cost comparison, ground source may win on efficiency in some cases. If you are looking at total value, air source often makes more sense.
How heat pumps compare with petrol boilers
This is the comparison most homeowners want. If you currently have mains petrol, a heat pump is not always guaranteed to cut your annual heating bill by a large margin. Petrol has historically been cheaper per unit than electricity, and that affects the maths.
What narrows the gap is efficiency. A boiler may be 85 to 92 per cent efficient in real-world use. A heat pump can achieve 250 to 400 per cent efficiency across the heating season when properly installed. That is why some homes do see useful savings, even against petrol.
The biggest gains tend to come in homes that already need heating system upgrades, such as larger radiators, better controls or improved insulation. In those cases, the heat pump becomes part of a broader efficiency improvement rather than a straight like-for-like swap.
If your boiler is fairly new and your property is not yet well insulated, savings may be modest. That is not a reason to rule out a heat pump, but it is a reason to get property-specific figures rather than rely on general averages.
How heat pumps compare with oil, LPG and electric heating
This is where heat pumps often make the strongest financial case.
If you heat your home with oil or LPG, you are exposed to fuel price swings and regular deliveries. A heat pump can offer more predictable running costs and remove the need for stored fuel. In many cases, it can be cheaper to run as well, especially when replacing older or less efficient systems.
For homes with direct electric panel heaters or old storage heaters, the difference can be even more noticeable. Standard electric heating converts electricity into heat one-for-one. A heat pump can produce several units of heat from the same electricity input, which is why it often delivers a clear reduction in running costs.
This matters in many flats, rural homes and older properties across South Wales and the South West where mains petrol is not always available. In those situations, a heat pump is often not just a greener option but a more economical one too.
What affects your bill more than the headline system type
The installer and design quality matter almost as much as the technology itself. A poorly designed heat pump system can run hotter than necessary, cycle inefficiently and cost more than expected. A well-designed one will be sized correctly, paired with suitable emitters and set up to run steadily.
Insulation also changes everything. Loft insulation, cavity wall insulation where appropriate, draught-proofing and decent glazing all help a heat pump work at lower flow temperatures. Lower temperatures usually mean better efficiency.
Your controls and habits matter too. Heat pumps generally work best when maintaining a stable indoor temperature rather than being switched on and off aggressively. That can feel different if you are used to a boiler blasting heat for short periods.
Tariffs are another overlooked factor. Time-of-use electricity tariffs may improve the maths for some households, particularly if they can shift part of their usage. If you also have solar panels, daytime generation may offset some electricity demand, although winter heating demand and solar output do not always align neatly.
Commercial properties and larger buildings
For commercial premises, the heat pump running cost comparison can look different again. Usage patterns are more varied, building sizes are larger, and heating demand may be concentrated into working hours.
That does not make the comparison harder so much as more site-specific. Offices, retail units and mixed-use buildings can benefit from heat pumps, but the right system depends on occupancy, insulation levels and whether heating and cooling are both needed. A proper assessment is especially important here because oversizing or undersizing becomes expensive quickly.
The best way to compare costs accurately
Online averages are useful for a first sense-check, but they are not enough for a final decision. What you need is a comparison based on your property, your current heating system and realistic heat demand.
That is why getting several quotes is so helpful. It lets you compare not only equipment prices but also projected running costs, system design and installer recommendations. If those quotes come from MCS-accredited professionals, you have a stronger basis for judging quality as well as cost.
For homeowners and businesses who want a simpler route, Solar Planet helps you compare trusted local installers without having to chase each one individually. That makes it easier to see whether a heat pump stacks up against your current system in real numbers, not guesswork.
So, are heat pumps cheaper to run?
Often yes, but not always by the same margin.
If you are replacing direct electric heating, oil or LPG, a heat pump is often cheaper to run and easier to live with over time. If you are replacing mains petrol, the answer depends more heavily on insulation, system design and tariff costs. Air source heat pumps are usually the practical choice for most homes, while ground source may suit properties where long-term efficiency justifies the extra installation cost.
The most sensible next step is not to look for a universal answer. It is to get an honest comparison for your building, your bills and your priorities. That is usually where the best decision becomes obvious.
