Replace your gas, oil, or LPG boiler with a cleaner, quieter, and more efficient heating system
– and get £7,500 off with the government grant.
We have all the necessary heat pump certifications and accreditations for complete peace of mind
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Why Homeowners Are Making the Switch
If you’re heating your home with a gas, oil, or LPG boiler – or relying on electric storage heaters – the chances are you already know something isn’t quite right. Bills keep climbing. The boiler is getting older. And there’s a nagging sense that there must be a better way.
There is. Air source heat pumps have quietly become the most practical, cost-effective route to cleaner home heating in the UK. Not as a future technology, but as a proven, mature system that millions of European homes already depend on. Here’s why so many homeowners in the south of England are making the switch.
Hear from One of Our Customers
Nothing speaks louder than the experience of a real homeowner. In this short video, one of our customers shares what it’s been like living with their heat pump – from the initial decision through to day-to-day life with the system.
Interested in finding out whether a heat pump is right for your home? Book a free consultation.
Call 0800 909 8882
How Does an Air Source Heat Pump Work?
An air source heat pump extracts heat from the outside air – even when temperatures are well below zero – and uses it to heat your home and your hot water. The process is powered by electricity, but because the system moves existing heat rather than generating it from scratch, it delivers far more energy than it consumes.
The cycle works in four stages:
- Absorb. A fan draws outside air over a heat exchanger in the outdoor unit. Inside the heat exchanger, a refrigerant fluid absorbs the warmth from the air and evaporates into a gas. This works at ambient temperatures as low as −25°C.
- Compress. An electrically powered compressor increases the pressure of the refrigerant gas, which raises its temperature significantly – high enough to heat your radiators and hot water.
- Transfer. The hot refrigerant passes through a second heat exchanger inside the property, where it releases its heat into the water circulating through your central heating system and hot water cylinder.
- Reset. The refrigerant cools, condenses back into a liquid, passes through an expansion valve, and returns to the outdoor unit to begin the cycle again.
The result is a heating system that typically delivers three to four units of heat for every one unit of electricity it consumes. That ratio – known as the Coefficient of Performance, or COP – is what makes heat pumps so much more efficient than conventional boilers.
Two Trusted Brands, One Expert Installation
We have selected two air source heat pump ranges from established European manufacturers – one premium, one offering outstanding value – so that you have a genuine choice that suits both your property and your budget.
Both ranges use R290, a natural refrigerant with a Global Warming Potential (GWP) of just 3. To put that in context, the older refrigerants still found in many heat pumps on the market – R32 and R410A – have GWPs of 675 and 2,088 respectively. Choosing R290 is a meaningful step towards reducing the environmental impact of your heating system, not just through lower emissions in use, but through the refrigerant itself.
Vaillant aroTHERM plus
Vaillant is one of Europe’s most established heating manufacturers, with over 140 years of experience and more than 200,000 heat pumps installed worldwide. The aroTHERM plus is their flagship air-to-water heat pump – a monobloc unit with a hermetically sealed refrigerant circuit, meaning no specialist refrigerant certification is required during installation.
The range comprises five single-phase models – 3.5 kW, 5 kW, 7 kW, 10 kW, and 12 kW – covering everything from compact flats to large detached homes. Key specifications include:
- Exceptional efficiency. The aroTHERM plus achieves a Seasonal Coefficient of Performance (SCOP) of up to 5.03, placing it among the most efficient heat pumps available in the UK. At a 35°C flow temperature, the 10 kW model delivers over five units of heat for every unit of electricity consumed.
- High flow temperatures. With a maximum flow temperature of 75°C, the aroTHERM plus is compatible with existing radiator systems as well as underfloor heating. This is a significant advantage for retrofit installations where replacing every radiator would be impractical or costly.
- Impressively quiet. The 3.5 kW, 5 kW, 7 kW, and 12 kW models are Quiet Mark accredited. At five metres, the sound pressure level of the smaller models drops to just 32 dB(A) – quieter than a whispered conversation. This makes the aroTHERM plus well suited to terraced and semi-detached properties where the outdoor unit may be close to a neighbour’s boundary.
- Built for British weather. The aroTHERM plus operates in ambient temperatures ranging from −25°C to +46°C. Its weatherproof construction and corrosion-resistant paint make it suitable even for coastal locations.
- Smart and solar-ready. The system is SG-ready, meaning it can be integrated with smart electricity tariffs and solar PV systems to further reduce running costs. When paired with Vaillant’s sensoCOMFORT controller and sensoNET internet gateway, homeowners can monitor and manage their heating remotely via an app.
- 7-year warranty. The Vaillant aroTHERM plus is backed by a 7-year parts and labour warranty, reflecting Vaillant’s confidence in the product’s reliability and longevity.
Grant Aerona 290
Grant UK has been manufacturing heating products in Great Britain for 30 years and is celebrating its 30th anniversary in 2026. The Aerona 290 is their fifth-generation heat pump – a range that combines modern aesthetics with high performance and Grant’s latest control technology, all at a lower price point than the Vaillant.
- Five single-phase models are available – 4 kW, 6.5 kW, 9 kW, 12 kW, and 15.5 kW – including the larger 15.5 kW unit, which makes the Grant range particularly well suited to bigger properties with higher heat demands. Key specifications include:
- Strong real-world performance. Each Aerona 290 model has been rated at −5°C air temperature and 55°C water flow temperature – a realistic UK winter scenario rather than the more optimistic test conditions some manufacturers quote. The 6.5 kW model achieves a SCOP of 5.08, and the range delivers a COP of up to 4.99 under standard conditions.
- High flow temperatures. Like the Vaillant, the Aerona 290 can achieve flow temperatures up to 75°C, making it compatible with both radiator and underfloor heating systems.
- Ultra-quiet operation. Every model in the Aerona 290 range is Quiet Mark accredited. The 4 kW unit has a sound power level of just 48 dB, with a sound pressure of only 31 dB(A) at three metres – barely distinguishable from background noise.
- Distinctive design. The Aerona 290 features a stylish dark powder-coated casing that sets it apart from the white boxes associated with older heat pump designs. It is, by some margin, one of the best-looking heat pumps on the market – a view shared by the installers who work with it daily.
- Smart monitoring. The Aerona Smart Controller features a 4.5-inch colour touchscreen with weather and load compensation, heating curve configuration, and 7-day programming. When paired with Grant’s WiFi hub, it offers full remote monitoring and management through the ecoNET app – giving both the homeowner and the installer visibility of system performance.
- 7-year guarantee. The Aerona 290 comes with a 7-year product guarantee when installed by a G1-accredited installer (terms and conditions apply). Grant also offers a 25-year guarantee on their QR2 hot water cylinder shells, which are designed to work seamlessly with the Aerona range.
- MCS certified. All Aerona 290 models are MCS certified and Connect & Notify approved, and the range was a finalist at the National ACR & Heat Pump Awards 2025.
Which One Is Right for You?
Both ranges use R290 refrigerant, deliver flow temperatures up to 75°C, and carry 7-year warranties. Both are installed to the same high standard by our teams.
The Vaillant aroTHERM plus is the premium choice – it has a slightly higher peak SCOP, a broader ecosystem of system accessories (including the integrated uniTOWER cylinder), and the heritage of one of Europe’s longest-established heating manufacturers. The Grant Aerona 290 offers excellent performance at a lower price point, with a striking modern design and Grant’s intuitive Smart Controller.
During your free consultation, we’ll recommend the right system for your home based on its size, insulation levels, existing heating distribution, and your budget. There is no one-size-fits-all answer, and we would rather steer you towards the system that genuinely makes sense for your situation than push the more expensive option for the sake of it.
Get £7,500 Off Your Heat Pump Installation
The Boiler Upgrade Scheme (BUS) is a UK government initiative designed to help homeowners move away from fossil fuel heating.
It provides a £7,500 upfront grant towards the cost of an air source heat pump installation – deducted directly from your invoice, so there is no money to claim back and no complicated paperwork to deal with.
Here is what you need to know:
- It’s not means-tested. Any homeowner in England or Wales can apply, regardless of household income.
- We handle the application. As your MCS-certified installer, Infinity Energy Services applies to Ofgem for the grant voucher on your behalf. You will receive a short, automated email from Ofgem asking you to confirm your consent – one click, and it’s done.
- It’s well funded. The scheme has a budget of £295 million for 2025/26 and is currently set to run until at least March 2028.
- 0% VAT applies too. Heat pump installations currently benefit from 0% VAT on both equipment and labour – a relief that is valid until at least 31 March 2027.
- Eligibility is straightforward. You must own the property (including second homes and buy-to-lets), and the heat pump must replace an existing fossil fuel or electric heating system. Self-build properties are eligible. New-build developer properties and social housing are not.
With the grant and the VAT relief combined, a fully installed air source heat pump system typically costs homeowners between £2,500 and £7,500, depending on the size of the system and the scope of any additional works.
From First Contact to Warm Home
We have designed our process to be straightforward, transparent, and as stress-free as possible. Here is what happens when you get in touch.
Why Infinity Energy Services?
Infinity Energy Services was founded in 2011 by Daniel Hanslip, and for over a decade we have been installing renewable energy systems across the south of England – from Taunton to Worthing, and from the Isle of Wight to Cheltenham.
We are not a single-product company. We install solar panels, battery storage, EV chargers, and air conditioning alongside heat pumps, which means we understand how these technologies work together as part of a whole-home energy strategy.
We are also part of a wider renewable energy installer base, allowing us to deliver higher volume and more complex installations. We have created a network of Infinity Certified Partners guaranteeing the highest standards. Our partner in Hampshire is ECS, a specialist heating and plumbing company, with over 10 years of experience and 1,000s of satisfied customers. They install both heat pumps and air conditioning.
If you already have solar panels, or you’re thinking about adding them, we can advise on how a heat pump fits into that picture to maximise your savings and minimise your reliance on the grid.
Our accreditations include MCS, RECC, NICEIC, NAPIT, TrustMark, and CHAS. We hold Tesla Powerwall Premium Installer status, and we have been named Best Regional Installer at the Energy Efficiency Awards in both 2023 and 2024.
Certified, Accredited & Award winning service
But accreditations only tell part of the story. What matters most is the quality of the work and the experience of the homeowner. Here are our latest testimonials:
Common Questions About Air Source Heat Pumps
How much does an air source heat pump cost?
A typical domestic air source heat pump installation costs between £10,000 and £15,000 including VAT (which is currently 0%). After the £7,500 Boiler Upgrade Scheme grant, most homeowners pay between £2,500 and £7,500. The exact figure depends on the size of your property, the heat pump model selected, and whether any additional works are needed – such as radiator upgrades or a new hot water cylinder. We provide a fully itemised quotation before you commit to anything.
Will a heat pump work in my home?
The vast majority of homes in the south of England are suitable for an air source heat pump. Properties that are well insulated and have adequate outdoor space for the unit will see the best performance. Our technical survey assesses your home’s suitability in detail – including insulation, existing radiators, hot water demand, and the proposed location for the outdoor unit – so you will know exactly what to expect before any work begins. If preparatory improvements are needed, such as loft insulation or radiator upgrades, we’ll include them in our proposal.
Are heat pumps noisy?
Not the ones we install. Both the Vaillant aroTHERM plus and the Grant Aerona 290 are Quiet Mark accredited. At three metres – roughly the distance from a wall-mounted unit to your garden fence – noise levels are typically between 34 and 37 dB(A). To put that in context, a quiet library measures around 40 dB(A), and a normal conversation is about 60 dB(A). In practice, most homeowners tell us they can barely hear the unit running.
Do heat pumps work in winter?
Yes, reliably. The Vaillant aroTHERM plus operates in ambient temperatures as low as −25°C, and the Grant Aerona 290 matches this for space heating. UK winters rarely come close to those extremes. If you’re wondering how a heat pump can extract heat from cold air, it helps to remember that “cold” in everyday terms still contains a significant amount of thermal energy. Even at −10°C, there is more than enough heat in the air for a well-designed heat pump to work effectively.
Can I keep my existing radiators?
In many cases, yes. Both the Vaillant aroTHERM plus and the Grant Aerona 290 can achieve flow temperatures up to 75°C, which is comparable to a conventional boiler. This means your existing radiators will often be sufficient without modification. Our technical survey will check each radiator’s output against your room-by-room heat loss calculation, and if any need upgrading, we’ll explain why and include the cost in your quotation.
How long does installation take?
A typical installation takes 3-5 days. This includes removing the old boiler (if applicable), installing the outdoor heat pump unit, connecting it to your heating and hot water system, commissioning, and a full handover. More complex installations – for example, those requiring extensive pipework modifications or a new hot water cylinder – may take a day or two longer.
What happens to my old boiler?
We remove your existing boiler and dispose of it safely as part of the installation. You do not need to arrange this separately.
What warranty do the heat pumps come with?
Both the Vaillant aroTHERM plus and the Grant Aerona 290 come with 7-year warranties (terms and conditions apply). A well-maintained heat pump should last at least 15-20 years, and many will continue operating effectively well beyond that.
What maintenance does a heat pump need?
A yearly inspection is required in order to ensure the heat pump is operating effectively and safely, and to maintain the relevant guarantees. Beyond that annual check, heat pumps require very little ongoing attention. There is no annual gas safety certificate, no flue to inspect, and no combustion-related risks to manage. Compared to a conventional boiler, the maintenance demands are minimal.
Can I combine a heat pump with solar panels?
Absolutely – and we would actively encourage it. A heat pump running on electricity generated by your own solar panels is about as close to free heating as it is possible to get. Both the Vaillant and Grant systems are designed to integrate with solar PV, and as a company that installs both heat pumps and solar panels, we can design a combined system that maximises your self-consumption and minimises your energy bills.
Ready to Make the Switch?
£7,500 off. Lower running costs. Cleaner heating. A quieter home. Expert installation from a team that’s been installing renewable energy systems for over a decade.
If you’re ready to explore whether an air source heat pump makes sense for your home, we’d love to hear from you. There’s no obligation, no hard sell – just a straightforward conversation with people who know this technology inside out.
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