How Do Hot Water Heat Pumps Work?

Hot water heat pumps - Evolve Renewables

As energy costs rise and climate change concerns grow, many homeowners in Kent and London are seeking more efficient and sustainable ways to heat their homes and water.

One increasingly popular solution is the hot water heat pump. These innovative systems work by transferring heat from the air, ground, or a nearby water source into your home, providing a low-carbon, cost-effective alternative to traditional boilers.

How Hot Water Heat Pumps Work

Heat pumps operate on a simple principle: they move heat from one place to another. A hot water heat pump extracts heat from the air, ground, or water outside your home and transfers it inside to warm your living spaces and hot water supply.

Air source heat pumps are the most common type in the UK, thanks to their versatility and suitability for a wide range of properties. They have an outdoor unit that absorbs heat from the air, even in temperatures as low as -15°C, and an indoor unit that compresses and circulates the heat through your home’s heating system.

Ground source heat pumps are even more efficient, relying on the stable temperatures found underground. A network of buried pipes absorbs heat from the earth. However, they require sufficient outdoor space for the ground loop installation.

Both types of heat pumps can achieve impressive efficiency ratings of 300-400%, producing 3-4 units of heat for every unit of electricity consumed. This is significantly higher than traditional gas boilers, which are typically only 90% efficient.

Advantages of Installing a Heat Pump in Your Kent or London Home

Switching to a hot water heat pump offers numerous benefits for Kent and London homeowners:

  1. Energy savings and reduced carbon footprint: Heat pumps are incredibly efficient, helping you lower your energy bills and carbon emissions.
  2. Versatility: A single heat pump can provide both heating and hot water, simplifying your home’s heating system.
  3. Durability: With proper maintenance, heat pumps can last 20-25 years, much longer than conventional boilers.
  4. Compatibility: Heat pumps work well with underfloor heating and larger radiators, making them suitable for many homes.
  5. Financial incentives: Government grants, such as the Renewable Heat Incentive (RHI), can help offset installation costs.

Considerations for Kent and London Homeowners

While heat pumps offer many advantages, there are some factors to consider:

  • Property suitability: Heat pumps work best in well-insulated homes. Older properties may require energy efficiency improvements before installation.
  • Space requirements: Air source heat pumps need an outdoor unit, while ground source systems require land for the ground loop. Ensure your property has sufficient space.
  • Upfront costs: Although long-term savings are significant, initial installation costs can be higher than traditional boilers. However, government incentives such as the boiler upgrade scheme (BUS Grant) can help mitigate this.

Real-Life Experiences from Local Heat Pump Owners

Many Kent and London residents have already embraced heat pump technology. Sarah, a homeowner in Maidstone, shares her experience:

“I was initially hesitant about installing an air source heat pump, but I’m so glad I did. Not only have my energy bills decreased, but my home feels warmer and more comfortable. The installation process was straightforward, and the low maintenance requirements are a huge bonus.”

Choosing the Right Heat Pump for Your Home


When considering a hot water heat pump, it’s essential to select the right system for your specific needs. Factors to consider include:

  1. Heat pump type: Determine whether an air source or ground source heat pump is most suitable for your property based on available space and installation requirements.
  2. Sizing: A properly sized heat pump is crucial for optimal efficiency and performance. An undersized system will struggle to meet your heating demands, while an oversized unit will waste energy and money. Consult with a professional installer to determine the appropriate size for your home.
  3. Compatibility: Ensure your home’s existing heating system, radiators, or underfloor heating are compatible with a heat pump. Some modifications may be necessary for optimal performance.
  4. Energy efficiency: Look for heat pumps with high Seasonal Coefficient of Performance (SCOP) ratings, as these indicate better efficiency and lower running costs.

The Evolve Renewables Advantage


At Evolve Renewables, we are committed to helping Kent and London homeowners transition to cleaner, greener heating solutions. Our team of certified installers has extensive experience designing and fitting heat pump systems tailored to the unique needs of each property.

When you choose Evolve Renewables for your heat pump installation, you can expect:

  • Thorough property assessment and personalised recommendations
  • High-quality, energy-efficient heat pump systems from leading manufacturers
  • Expert installation and configuration for optimal performance
  • Comprehensive aftercare and maintenance services
  • Assistance with applying for government grants and incentive

Take the Next Step Toward Sustainable Heating


Ready to enjoy the benefits of a hot water heat pump in your Kent or London home? Contact Evolve Renewables today to schedule a consultation. Our knowledgeable team will guide you through the process, answering any questions you may have and providing a customised solution for your home.

Together, we can work towards a more sustainable future, one heat pump at a time.


  1. How much does a hot water heat pump cost to install? Installation costs vary depending on the type of heat pump, property size, and existing heating system. On average, air source heat pumps cost between £7,000 and £14,000, while ground source heat pumps range from £15,000 to £35,000. However, government incentives can significantly reduce these costs.
  2. Are heat pumps suitable for older properties? Heat pumps can work well in older properties, provided the home is well-insulated and draught-proofed. In some cases, energy efficiency improvements may be necessary before installation to ensure optimal performance.
  3. How long do heat pumps last? With proper maintenance, heat pumps can last 20-25 years or more, significantly longer than traditional boilers.
  4. Do heat pumps require a lot of maintenance? Heat pumps generally require less maintenance than combustion-based heating systems. An annual check-up by a professional is recommended to ensure optimal performance and efficiency.
  5. Can heat pumps provide cooling in the summer? Some heat pump systems, known as reverse cycle or air-to-air heat pumps, can provide both heating and cooling, making them a versatile solution for year-round comfort.

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Government Grants

If you live in England or Wales, your installer can apply for a £7,500 grant through the Boiler Upgrade Scheme to cut the cost of installing your air source heat pump. We will apply for the grant on your behalf! The scheme covers heat pump installations that take place before the end of March 2028

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