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About GrantGrant Air Source Heat Pump Models1. Grant Aerona 290 Air Source Heat Pump2. Grant Aerona³ Air Source Heat PumpHow Efficient Are Grant Air Source Heat Pumps?How Much Does a Grant Air Source Heat Pump Cost?How Much Does a Grant Heat Pump Cost to Run?Grant Heat Pump Controls and Smart FeaturesAre Grant Air Source Heat Pumps Noisy?Grant Air Source Heat Pump Pros and ConsGrant Heat Pumps vs Other Leading BrandsIs a Grant Air Source Heat Pump Right for Your Home?Grant Air Source Heat Pumps FAQs
About GrantGrant Air Source Heat Pump Models1. Grant Aerona 290 Air Source Heat Pump2. Grant Aerona³ Air Source Heat PumpHow Efficient Are Grant Air Source Heat Pumps?How Much Does a Grant Air Source Heat Pump Cost?How Much Does a Grant Heat Pump Cost to Run?Grant Heat Pump Controls and Smart FeaturesAre Grant Air Source Heat Pumps Noisy?Grant Air Source Heat Pump Pros and ConsGrant Heat Pumps vs Other Leading BrandsIs a Grant Air Source Heat Pump Right for Your Home?Grant Air Source Heat Pumps FAQs
Grant is an established UK heating manufacturer offering air source heat pumps designed to provide home heating and hot water. Its Aerona range includes the newer Aerona 290 models, which use R290 refrigerant, and the Aerona³ range, which uses R32.
In this Grant air source heat pump review, we'll compare the available models, explore their efficiency and features, and look at installation costs and potential benefits.
We'll also explain what to consider before deciding whether a Grant heat pump is right for your home.
Thinking about installing a heat pump? Complete the form below to get a free heat pump quote from one of our specialists:
Grant Engineering has supplied heating products for more than four decades and has been involved in air source heat pump technology for over 15 years. Its product range in the UK includes traditional heating systems alongside renewable heating solutions.
The company's air source heat pumps are designed to transfer heat from the outside air into a home's heating system. They can work with suitable radiators or underfloor heating and provide hot water when installed as part of an appropriately designed system.
Grant's current residential range includes two main air source heat pump options: the Aerona 290 and the Aerona³. Both use inverter-driven technology, which allows the heat pump to adjust its output to match the heating demand.
Grant offers different heat pump sizes to suit a range of properties and heating requirements. The best option for your home will depend on its heat loss, insulation, heating system and hot water demand.
The two main ranges have different specifications, so it's worth comparing their features before choosing a model:
| Heat Pump Range | Available Outputs | Refrigerant | Key Features |
|---|---|---|---|
| Grant Aerona 290 | 4kW, 6.5kW, 9kW, 12kW and 15.5kW | R290 | A+++ energy rating at 35°C flow temperature, Quiet Mark accreditation, modern design and smart control options |
| Grant Aerona³ | 6kW, 10kW, 13kW and 17kW | R32 | A+++ energy rating at 35°C flow temperature, compact design, low operating noise and straightforward maintenance |
Both ranges have models with different outputs, allowing an installer to select a system based on your home's heating requirements. The specifications and efficiency ratings vary between individual models and operating conditions.
Available sizes: 4kW, 6.5kW, 9kW, 12kW and 15.5kW
Key features:
Uses R290 natural refrigerant
A+++ energy rating at 35°C water flow temperature
Quiet Mark accreditation across the range
Inverter-driven operation
Aerona Smart Controller compatibility
Remote access when paired with the required Wi-Fi hub
Integrated frost protection features
Seven-year guarantee available when installed by an eligible Grant G1 Installer, subject to terms and conditions
The Grant Aerona 290 is the manufacturer's fifth-generation air source heat pump range. It uses R290 refrigerant, also known as propane, which has a low global warming potential of 3.
The range is designed to provide efficient heating and hot water while keeping noise levels low. Its outdoor units have a dark, powder-coated finish, giving them a more contemporary appearance than some traditional heating appliances.
One of the range's main features is its inverter-driven technology. Rather than operating only at full output, the heat pump can adjust its performance to match the amount of heat your home needs. This can help it operate more efficiently when the system is correctly sized and configured.
The Aerona 290 is also designed to operate in cold weather, with Grant stating an operating temperature range of -25°C to +35°C. Actual heat output and efficiency will depend on outdoor conditions and the required water temperature.
For homeowners who want greater control over their heating, the Aerona Smart Controller allows heating schedules to be set. Remote access is also available when the system is paired with the required Smart Wi-Fi Hub.
The range has an A+++ energy rating at a 35°C water flow temperature and has received Quiet Mark accreditation. These features make it worth considering if energy efficiency and outdoor noise are important factors in your decision.
Available sizes: 6kW, 10kW, 13kW and 17kW
Key features:
Uses R32 refrigerant
A+++ energy rating at 35°C water flow temperature
Inverter-driven technology
Compact outdoor unit design
Low operating noise levels
Programmable room thermostat options
Compatible with Homely heat pump optimisation controls when installed with the Aerona Remote Controller
Seven-year guarantee available when installed by an eligible Grant G1 Installer, subject to terms and conditions
The Grant Aerona³ is another air-to-water heat pump range designed to provide heating and hot water for residential properties. It offers four output options, from 6kW to 17kW, to accommodate different heating requirements.
Like the Aerona 290, the Aerona³ uses inverter-driven technology to adjust its output according to demand. It also has a compact outdoor design, which may help when planning an installation where available space is limited.
The main difference between the two ranges is their refrigerant. The Aerona³ uses R32, while the Aerona 290 uses R290. R290 has a lower global warming potential, although the most suitable system will also depend on the required output, efficiency, installation and overall cost.
The Aerona³ can be operated using compatible programmable controls, allowing homeowners to manage their heating schedules. It can also work with Homely heat pump optimisation controls when the appropriate Grant Remote Controller is installed.
The range has an A+++ energy rating at a 35°C water flow temperature. However, efficiency ratings alone do not determine how much a system will cost to run, as actual performance depends on the property and how the heating system is designed and used.
Grant's air source heat pumps are designed to provide heating efficiently by transferring heat from the outside air into your home. Instead of generating all their heat from electricity, they use electricity to move existing heat energy.
Both the Aerona 290 and Aerona³ ranges achieve an A+++ energy rating at a 35°C water flow temperature. The ratings are lower at higher flow temperatures, so it's important to compare like-for-like specifications when assessing different models.
The table below shows the published seasonal coefficient of performance (SCOP) figures for the Aerona 290 range.
| Aerona 290 Model | SCOP at 35°C Flow Temperature | SCOP at 55°C Flow Temperature |
|---|---|---|
| 4kW | 5.00 | 3.66 |
| 6.5kW | 5.08 | 3.62 |
| 9kW | 4.74 | 3.69 |
| 12kW | 4.74 | 3.74 |
| 15.5kW | 4.56 | 3.33 |
SCOP measures a heat pump's seasonal efficiency under specified test conditions. For example, a SCOP of 4 means the system produces around four units of heat for every unit of electricity it uses over the assessed period.
These figures are useful for comparing models, but they are not a guarantee of the efficiency you will achieve at home. Real-world performance will depend on factors such as outdoor temperatures, flow temperatures, insulation and the quality of the installation.
To help a Grant heat pump operate efficiently, your installer should calculate your property's heat loss, select suitable radiators or underfloor heating and configure the controls correctly. Keeping your home well insulated can also reduce the amount of heat required.
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The cost of installing a Grant air source heat pump will depend on the model, the size of your property and the work required to fit the system.
The heat pump itself is only part of the total cost. Your installation quote may also include a hot water cylinder, heating controls, pipework, radiators, electrical work and system commissioning.
Replacing a boiler with a heat pump can involve additional work, particularly if your existing radiators or pipework are unsuitable. The installer may need to upgrade some components to ensure your home can be heated effectively at lower water temperatures.
There is no single installation price that applies to every Grant system. The best way to understand the likely cost is to arrange a property assessment and request a detailed quote, like one from Glow Green.
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Eligible homeowners in England and Wales may be able to reduce their upfront costs through the Boiler Upgrade Scheme.
As of October 2026, the scheme generally provides £7,500 towards an eligible air-to-water heat pump installation. Some eligible properties that are not connected to mains gas and are replacing oil or LPG heating may qualify for £9,000, subject to the scheme's requirements.
The grant is claimed by an eligible installer and deducted from the installation cost, rather than paid directly to the homeowner. Your installer, such as Glow Green, can explain whether your property and chosen system qualify.
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The running cost of a air source heat pump depends on how much heat your home needs and how efficiently the system operates.
Your electricity tariff also plays an important role. A heat pump uses electricity, but it can produce several units of heat for each unit of electricity consumed. This means its running costs can compare favourably with some conventional heating systems, depending on energy prices and the efficiency of the installation.
Several factors affect how much you will pay to run a Grant heat pump:
Property insulation: A well-insulated home loses less heat and generally needs less energy to stay warm.
Heat pump size: The system needs to be correctly sized for your home's heating demand.
Flow temperature: Lower flow temperatures can improve efficiency when the heating system is designed to operate at them.
Heating controls: Correctly configured schedules and weather compensation can help prevent unnecessary energy use.
Electricity tariff: Your unit rate and any time-of-use pricing can affect your bills.
Hot water demand: The number of people in your household and your hot water habits will influence energy use.
Before choosing a system, ask your installer for an estimate based on your property's heat loss, expected electricity use and available tariffs. Comparing the projected running costs with your current heating system can help you assess the potential long-term savings.
Heating controls can help you manage your home's temperature and understand how your heat pump is operating.
Grant offers different control options across its Aerona range, including the Aerona Smart Controller and Aerona Remote Controller. The features available will depend on the controller and system configuration you choose.
The Smart Controller allows you to set heating schedules and, when paired with the required Wi-Fi hub, access your system remotely. This can be useful if you want to adjust your heating without being at home.
The Aerona³ can also work with compatible Homely heat pump optimisation controls when installed with the appropriate Remote Controller. These controls are designed to help optimise heat pump operation.
However, smart controls alone cannot guarantee lower bills. The system still needs to be correctly designed, installed and configured to suit your property.
Noise is an important consideration when choosing an air source heat pump, particularly if the outdoor unit will be close to a bedroom window, patio or neighbouring property.
Grant highlights noise reduction as a feature of its Aerona range. The Aerona 290 has Quiet Mark accreditation, while the Aerona³ range is also designed for low operating noise.
The noise you experience will depend on the model, operating conditions and location of the unit. Heat pumps can sound louder when working harder in colder weather, so the installation position should be considered carefully.
Your installer should assess the available outdoor space and position the unit in line with the manufacturer's instructions and any relevant noise requirements. A suitable location can help minimise disturbance while allowing enough airflow for the heat pump to operate effectively.
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Grant offers several features worth considering, but the best choice will depend on your home's heating requirements, budget and installation options.
Choice of models: The Aerona 290 and Aerona³ ranges offer different outputs for a range of domestic heating requirements.
High efficiency ratings: Both ranges achieve A+++ energy ratings at a 35°C water flow temperature.
Lower-impact refrigerant option: The Aerona 290 uses R290, which has a global warming potential of 3.
Noise-conscious design: The Aerona 290 has Quiet Mark accreditation.
Smart control options: Compatible controllers allow heating schedules and, with the required equipment, remote access.
Extended guarantee option: Eligible installations by Grant G1 Installers can qualify for a seven-year guarantee, subject to terms and conditions.
Installation costs vary: The overall price can increase if your property needs new radiators, pipework or other heating upgrades.
Efficiency depends on the property: A high product rating does not guarantee the same performance in every home.
Outdoor space is required: The heat pump needs a suitable external location with adequate airflow.
Different control options: Remote access and optimisation features may require additional compatible equipment.
Model selection requires care: The largest heat pump is not necessarily the best choice; the output needs to match your property's heat loss.
Grant is one of several manufacturers offering air source heat pumps in the UK. When comparing brands, it's worth looking beyond headline efficiency ratings and considering model output, refrigerant, controls, noise, warranties and installation support.
Grant and Viessmann both offer air-to-water heat pumps for domestic heating and hot water. Grant's Aerona range includes the Aerona 290 and Aerona³, while Viessmann offers models such as the Vitocal 150-A and Vitocal 200-A.
The Aerona 290 uses R290 refrigerant and offers outputs up to 15.5kW. Viessmann also offers R290 models, with specifications and output ranges that vary by product.
The best option will depend on the heating requirements of your property, the features you want and the full installation quote. Read our Viessmann air source heat pump review for a closer look at its range.
Grant and LG offer heat pumps with different outputs and system features. Grant's Aerona 290 uses R290 refrigerant, while LG's range includes R290 and R32 models, depending on the product.
LG's THERMA V systems offer different configurations and features, so it's important to compare individual models rather than the brands as a whole.
Your installer can help determine which option best suits your home and existing heating system. Read our LG air source heat pump review to learn more.
Both Grant and Samsung offer air source heat pumps designed to provide home heating and hot water. Their product ranges differ in terms of available outputs, system configurations, controls and refrigerants.
Grant's Aerona 290 is a monobloc system, with its main refrigerant components contained in the outdoor unit. Samsung offers different EHS system configurations, so installation requirements can vary by model.
Compare the specifications and installation proposals for the systems suitable for your home. Our Samsung air source heat pump review provides more detail on its range.
Grant and Daikin both manufacture air-to-water heat pumps for residential properties. Their ranges include models with different outputs, efficiency figures and control options.
The Aerona 290 stands out for its use of R290 refrigerant and Quiet Mark accreditation. Daikin offers its own range of heating and climate systems, with features that vary between models.
When comparing the two, consider the expected efficiency at your required flow temperature, the installation cost and the support available from your installer. Read our Daikin air source heat pump review for more information.
Grant and Vaillant both offer air source heat pumps for homeowners looking to move away from conventional fossil fuel heating.
Grant's Aerona range includes the R290 Aerona 290 and R32 Aerona³, while Vaillant's range includes the aroTHERM family. Available outputs, controls, refrigerants and system designs vary across both manufacturers.
The most suitable option will depend on your property, the heating system you need and the installation package available. See our Vaillant air source heat pump review for a closer comparison.
A Grant air source heat pump could be worth considering if you want to replace a gas or oil boiler with a lower-carbon heating system. Its Aerona range offers different outputs, with the Aerona 290 providing an R290 refrigerant option and Quiet Mark accreditation.
However, choosing the right heat pump involves more than selecting a brand. Your home's insulation, heat loss, radiators, hot water requirements and available outdoor space will all affect which system is suitable.
It's also important to compare the total installation price and estimated running costs. A correctly sized and installed heat pump can perform efficiently, but the results will depend on the design of your heating system and how you use it.
Before making a decision, ask a qualified heat pump installer, such as Glow Green, to assess your home and compare suitable models from different manufacturers.
Thinking about installing a heat pump? Get a heat pump quote from Glow Green to discuss your property and the options available.
The lifespan of a Grant air source heat pump will depend on its installation, usage and maintenance. Regular servicing and keeping the outdoor unit clear of obstructions can help maintain performance over time.
Follow Grant's guidance for your specific model and the requirements of your guarantee. Regular checks by a qualified professional can help identify potential issues, maintain efficiency and ensure the system is operating as intended.
Yes, a Grant air source heat pump can work with radiators if they are suitable for the system's required flow temperatures and your home's heating demand. Some properties may need larger radiators or other adjustments.
Yes, solar panels can generate electricity to help power a heat pump. The amount of solar electricity available will depend on the time of year, weather and your household's energy use. A compatible battery may allow you to store some surplus electricity for later use.
Grant advertises a seven-year guarantee for eligible Aerona 290 and Aerona³ installations completed by a Grant G1 Installer who meets the relevant requirements. Terms and conditions apply, so confirm the guarantee period and any registration or servicing requirements before installation.
