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Writer's pictureGreenwave Renewables

Heat Pumps vs. Boilers

Traditional heating systems like gas boilers have served us well, but let’s face it—they’re outdated. They rely on burning fossil fuels, contribute significantly to carbon emissions, and are only about 90-95% efficient at best. Compare that to air source heat pumps, which can deliver 3-5 times the energy they consume. That’s right: for every unit of electricity you use, ASHPs can generate up to five units of heat. It’s not just heating—it’s smart heating.







How Air Source Heat Pumps Work


Heat pumps operate by transferring heat from one place to another rather than generating heat directly. They use electricity to move heat from the air, ground, or water outside your home to heat the water that circulates around your home.


  1. Pull in air: The pump pulls in air from outside. 

  2. Heat a refrigerant: The air heats a special refrigerant liquid, which turns into gas. 

  3. Compress the gas: The gas is compressed to increase its temperature. 

  4. Transfer heat: The heat is transferred to water in your radiators, underfloor heating, or hot water cylinder. 

  5. Cool and repeat: The gas cools down, turns back into liquid, and returns to the start of the cycle. 


Other types of Heat Pumps include Ground-Source Heat Pumps (GSHPs) also known as geothermal heat pumps; they draw heat from the ground as well as Water-Source Heat Pumps, which utilize water sources like lakes or wells.



How Boilers Work


Boilers, on the other hand, generate heat by burning fuel (such as natural gas, oil, or biomass) or using electricity to heat water. This heated water or steam is then circulated through radiators, underfloor heating, or baseboards to warm your home.


Types of Boilers:


  1. Gas Boilers: Powered by natural gas or LPG.

  2. Oil Boilers: Common in areas without access to gas lines.

  3. Electric Boilers: Use electricity to heat water without combustion.

  4. Biomass Boilers: Burn renewable materials like wood pellets.




    Key Differences Between Air Source Heat Pumps and Boilers

Feature

Air Source Heat Pumps

Boilers

Efficiency

3-5 times more efficient than boilers.

Highly efficient (90-95%) but less so than ASHPs.

Carbon Emissions

Low, especially when using green electricity.

High unless using a biomass boiler.

Installation Cost

Higher upfront costs (approx. £8,000-£14,000).

Lower initial cost (approx. £2,000-£6,000).

Operating Cost

Lower if electricity prices are affordable.

Depends on fuel type; gas is typically cheaper than electricity.

Space Requirements

Outdoor unit and space for internal systems.

Smaller footprint; no outdoor unit needed.

Maintenance

Regular servicing required for maximum efficiency.

Annual maintenance recommended for safety and efficiency.


Both air source heat pumps and boilers have their merits, but when it comes to efficiency, sustainability, and long-term savings, air source heat pumps stand out as the superior choice. If you’re looking to reduce your energy bills, lower your carbon footprint, and future-proof your home, an air source heat pump is the forward-thinking solution you need.


Air source heat pumps are designed to deliver consistent, eco-friendly heating—even in colder climates—with the added benefit of cooling in the summer. And with government incentives available, there’s never been a better time to make the switch.


Ready to take the next step? Call 01284 598 076 today to book an engineer to survey your property and see how an air source heat pump could revolutionize your home heating. Don’t wait—upgrade to a smarter, greener heating system and enjoy comfort that works for both your wallet and the planet.



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