Heat Pumps vs. Traditional Heating Methods

As energy costs climb and environmental awareness grows, people are increasingly considering alternative heating methods..

In this article, we’ll explore how heat pumps stack up against conventional central heating in terms of:

• Efficiency
• Cost
• Environmental impact. 

So, are heat pumps the right solution for your needs? Let’s find out.

Traditional heating methods

Central heating became standard in UK homes during the 1970s and 1980s. Before that, households relied on fireplaces and stoves for heat.

Boiler technology has evolved quickly since then. There are several types of modern boilers, and many are now approximately 90% efficient (older boilers were around 65%).

But according to the National Audit Office, 18% of the UK’s greenhouse gas emissions still come from heating homes.

Let’s examine which traditional heating methods offer the best efficiency.

Gas central heating

Most – but not all – homes across the UK rely on the gas network.

Their hot water is produced by a gas-fired boiler that heats and then circulates water through radiators and pipes throughout the home.

Newer gas combi boilers work differently by heating water on demand directly from the mains rather than storing it in a hot water tank.

Pros

• Fast. Can quickly heat multiple rooms at once
• Reliable. Gas supplies remain active during electricity power cuts
• Straightforward. It’s simple to upgrade from a traditional gas boiler to a modern combi boiler.

Cons

• Expensive. Ofgem estimates the average annual gas cost for a typical household at around £500 to £600, though larger or poorly insulated homes pay significantly more.
• Unpredictable pricing. Global supply levels and national policies influence UK gas prices dramatically.
• Not highly environmentally friendly. However, it must be noted that some alternatives to boilers may rely on supply chains that are at least in part also not environmentally friendly.

Electric heating systems

Properties not connected to the gas grid often rely on electric heating systems.

These use storage heaters that charge overnight when off-peak electricity tariffs are cheapest. And ceramic bricks inside the unit retain warmth and disburse heat throughout the day. 

Whilst they can be relatively cost-effective during off-peak hours, running them on peak tariffs can be expensive.

Immersion heaters use electric coils inside a hot water cylinder to supply hot water. These systems remain popular in homes without a mains gas supply.

Pros 

• Cost-effective potential. Especially when hot water cylinders are properly insulated. 
• Accessible. Especially for flats and properties without a gas connection. 
• Efficient. Thermostats provide direct temperature control, ensuring heating does not run longer than required.

Cons 

• Costs. Heating a home using standard grid electricity is generally more expensive than gas per unit of energy.
• Variable pricing. Electricity costs significantly more during peak daytime hours. 
• Unsuitability for larger properties. larger properties often struggle to maintain consistent temperatures using electric space heaters alone.

Oil heating

Just over one million UK households use oil central heating.

It operates similarly to the gas system, except that instead of drawing fuel from the grid, it draws it from oil in a storage tank on your property. 

Pros

• Cost efficient (sometimes). Households can save money by purchasing heating oil when market prices fall.
• Suitable for rural areas. Homes without access to the mains gas network can secure reliable heating with oil. 

Cons

• Requires upfront costs. Purchasing bulk fuel upfront can require significant capital outlay.
• Not environmentally friendly. Heating oil remains a non-renewable fossil fuel.

Heat pumps

Heat pumps absorb ambient energy from the surrounding environment to deliver space heating and hot water.

They significantly reduce households’ day-to-day reliance on fossil fuels.

There are three main types of heat pumps available. Let’s examine each in detail.

Air-source heat pumps

Air-source heat pumps are the most popular type of heat pump. They feature an external unit that extracts ambient heat from outdoor air. 

A heat exchanger transfers this energy into your central heating system to warm radiators, hot water and – if you have it – underfloor heating.

It’s difficult to like-for-like compare heat pump efficiency to boilers. Their efficiency is measured using a Coefficient of Performance (CoP). 

A CoP of 3 means the pump generates 3 units of heat for every 1 unit of electricity it uses. This makes it two to three times more efficient than a direct electric heater.

However, they do still rely on electricity, which is often produced using methods that rely on carbon dioxide production.

Pros

• Low space requirements. They require less outdoor space than ground-source systems. 
• Clean energy (day-to-day). No fossil fuels on are needed on site.
• Lower energy bills. They generate more heat energy than the electrical energy they consume. When paired with solar panels and home batteries, their savings increase further.

Cons

• Up-front cost. Much higher upfront installation fees than gas boilers
• Efficiency seasonal. Their efficiency varies slightly with extreme seasonal outdoor temperature changes.

Aside: Why MCS certification matters for heat pumps To qualify for government grants, heat pumps must be installed by an MCS-certified contractor. Microgeneration Certification Scheme standards ensure installers perform detailed heat loss calculations, guaranteeing correct sizing and efficient low-flow operation.

Water and ground-source heat pumps

Ground-source heat pumps draw thermal energy from constant subsurface ground temperatures.

And water-source heat pumps extract heat from nearby lakes, rivers, or large ponds.

Installing a ground-source heat pump requires either:

• Horizontal trenches dug across a substantial area of garden
• Vertical boreholes drilled 80 to 150 metres deep. 

Whilst water-source systems require direct access to a suitable nearby water body.

Pros

• Consistent performance. Ground and water-source heat pumps deliver reliable heating regardless of freezing outdoor air temperatures.
• Zero direct emissions. Systems generate no on-site fossil fuel emissions, offering a highly sustainable heating option.
• Long-term savings. Efficient operation can save hundreds of pounds on annual heating bills.

Cons

• Limited suitability. Properties without a nearby water source or adequate garden space cannot install these systems.
• Complex installation. Installation takes longer and incurs higher initial groundworks costs than air-source units.

Heat pump vs central heating comparison

Upfront cost

• Gas boiler: £3,000–£5,000
• Oil boiler: £4,000–£6,000
• Electric heating: £2,500–£4,500
• Air source heat pump: £3,500–£6,500 (after £7,500 BUS grant)

Efficiency / CoP

• Gas boiler: 89–93%
• Oil boiler: 85–91%
• Electric heater: 100%
• Air source heat pump: 300–400% / CoP 3.0–4.0.

Primary fuel source

• Gas boiler: Mains natural gas
• Oil boiler: Heating oil
• Electric heater: Grid electricity
• Air source heat pump: Grid electricity

The bottom line

According to the Energy Saving Trust, switching from an older gas boiler to an air source heat pump in a typical semi-detached home can save around £290 per year on energy bills.

(However, exact savings depend on property insulation, system sizing, and your chosen tariff.)

When comparing a heat pump vs combi boiler, remember that heat pumps operate differently.

Whilst combi boilers heat hot water instantly on demand from the mains, heat pumps heat water gradually and store it in an insulated hot water cylinder.

Our customers can also use our heating and solar plans that split the cost of heat pumps into monthly installments, complete with regular servicing and repairs.

Feel free to contact us today.