LG Air Source Heat Pump Review (UK 2026)

LG is a well-known technology brand, but its product range extends beyond TVs and air conditioning. The company also manufactures air source heat pumps designed to provide efficient heating and hot water for homes.

In this LG air source heat pump review, we look at the company's heat pump range, including key features, efficiency, available sizes and performance.

We'll also explore the potential benefits and drawbacks of choosing an LG heat pump, helping you decide whether it's suitable for your home.

Thinking about installing a heat pump? Get a heat pump quote by completing the form below, and one of our specialists will be in touch:

About LG

LG is a South Korean technology company known for a wide range of consumer electronics and home appliances, including TVs, washing machines, refrigerators and air conditioning systems. The company has also developed heating solutions designed to improve energy efficiency in homes and businesses.

LG's air source heat pumps form part of its THERMA V range. These air-to-water systems use heat from the outside air to provide heating and hot water, offering an alternative to traditional fossil fuel heating systems.

The THERMA V range includes different system types and power outputs, giving people options depending on their property's size, heating requirements and existing heating system. LG also offers models using different refrigerants, including lower-global-warming-potential options such as R290.

In the following sections, we'll look at the main LG air source heat pump models, their features and available power outputs to help you understand which systems may be suitable for different homes.

Leading LG Heat Pumps

THERMA V R290 Monobloc

Available Sizes: 7kW, 9kW, 12kW, 14kW, 16kW

• Uses low-GWP R290 natural refrigerant

• Up to 75°C water temperature

• Operates effectively in temperatures as low as -28°C

• LG ThinQ connectivity

• A+++ energy efficiency

The LG THERMA V R290 Monobloc is an air-to-water heat pump designed to provide heating and hot water for residential properties. As a monobloc system, the main heat pump components are contained within the outdoor unit, with water pipes connecting it to the home's heating system.

The system is available in a range of power outputs, making it suitable for different property sizes and heating requirements. LG also offers the R290 Monobloc with different indoor unit configurations, allowing the system to be matched to the requirements of individual installations.

The heat pump can also be connected to the LG ThinQ app, allowing homeowners to control their heating and monitor energy consumption remotely.

THERMA V R32 Monobloc S

Available Sizes: 5kW, 7kW, 9kW, 12kW, 14kW, 16kW

• Uses R32 refrigerant

• Up to 65°C leaving water temperature

• Operates in outdoor temperatures as low as -25°C

• A+++ energy efficiency for low-temperature applications

• LG ThinQ connectivity and smart grid compatibility

The LG THERMA V R32 Monobloc S is an air-to-water heat pump designed to provide heating and hot water for residential properties. Its monobloc design houses the main hydronic components within the outdoor unit, helping to simplify the system layout and installation.

The range is available in several power outputs, allowing installers to select a system based on the home's heating requirements. The larger models are also available with either single-phase or three-phase power supplies, depending on the specific model.

The system includes built-in water flow and pressure sensors to help monitor the water circuit, while its control system can adjust water flow to support efficient operation. LG also provides options for energy monitoring and integration with other technologies, including solar PV and energy storage systems.

THERMA V R32 Split

Available Sizes: 5kW, 7kW, 9kW

• Uses R32 refrigerant

• A+++ energy efficiency

• Maximum water temperature of up to 65°C

• Designed to operate in outdoor temperatures as low as -25°C

• Available with Hydro Unit or Combi Unit configurations

The LG THERMA V R32 Split is an air-to-water heat pump that uses a split system design, with the outdoor and indoor units connected by refrigerant pipework. This allows the system to be configured with either a Hydro Unit or Combi Unit, depending on the requirements of the property.

The Combi Unit provides an integrated hot water cylinder, while the Hydro Unit offers greater flexibility for properties with a separate hot water setup. This makes the system suitable for different installation requirements, particularly in new-build homes and smaller renovation projects.

The THERMA V R32 Split is available in three power outputs, allowing the system to be selected according to the home's heating requirements. It can provide space heating, cooling and domestic hot water, depending on the system configuration.

THERMA V R32 Hydrosplit

Available Sizes: 12kW, 14kW, 16kW

• Uses R32 refrigerant

• A+++ energy efficiency

• Hydrosplit system design

• Heating and domestic hot water

• LG ThinQ connectivity

The LG R32 Hydrosplit is an air-to-water heat pump designed to provide heating and hot water for residential properties. Its Hydrosplit configuration separates the outdoor and indoor components while keeping the refrigerant circuit within the outdoor unit.

The system is available with different indoor unit options, providing flexibility when planning the installation and allowing the setup to be matched to the home's heating and hot water requirements.

With 12kW, 14kW and 16kW models available, the R32 Hydrosplit is particularly suited to properties with higher heating demands. LG's ThinQ platform also provides smart control options, allowing homeowners to manage their heating remotely.

Pros of LG Air Source Heat Pumps

LG offers a range of air source heat pumps designed to suit different types of homes and heating requirements. Across the THERMA V range, there are several features that may make LG a suitable option for people considering a heat pump.

Some of the main advantages include:

• Energy efficient: LG air source heat pumps can achieve high efficiency ratings, helping to reduce the amount of energy needed to heat your home.

• Low-carbon heating: Heat pumps use heat from the air rather than burning fossil fuels, providing a lower-carbon alternative to traditional gas or oil heating.

• Range of models: LG offers different system types and power outputs, making it possible to choose a heat pump based on your property's heating requirements.

• Suitable for different properties: The THERMA V range includes systems designed for new builds, renovations and homes with higher heating demands.

• Smart controls: Compatible LG systems can be connected to the LG ThinQ platform, giving homeowners greater control over their heating.

• High-temperature heating: Some LG models can produce higher water temperatures, which can make them suitable for properties with existing radiator systems, subject to a professional assessment like one that would be done by Glow Green.

• Low-GWP refrigerant option: LG's R290 models use a natural refrigerant with a significantly lower global warming potential than many conventional refrigerants.

• Heating and hot water: LG air-to-water heat pumps can provide both space heating and domestic hot water from a single system, depending on the installation and configuration.

Cons of LG Air Source Heat Pumps

While LG air source heat pumps offer a number of potential benefits, there are also some factors to consider before choosing one. The suitability and overall cost of a heat pump can depend on your property, existing heating system and installation requirements.

Some of the main disadvantages include:

• Higher upfront cost: Installing an air source heat pump can sometimes cost more initially than replacing a conventional gas boiler, although eligible homeowners may be able to access heat pump grants, such as the Boiler Upgrade Scheme (BUS).

• Installation space required: The outdoor unit needs sufficient space and clear airflow around it, which can be challenging for homes with limited outdoor space.

• Potential heating system upgrades: Some properties may require larger radiators, improved insulation or other changes, such as underfloor heating, to achieve the best performance from a heat pump.

• Electricity dependent: LG heat pumps run on electricity, so their running costs are affected by electricity prices and the home's overall energy efficiency.

• More complex installation: Correct sizing and installation are important for performance, meaning a professional property assessment is required before installation. As a trusted heat pump installer, Glow Green can provide this assessment for you.

• Outdoor unit noise: Although modern heat pumps are designed to operate quietly, the outdoor unit will still produce some noise while running and needs to be positioned carefully.

• Performance varies with outdoor temperature: Heat pumps generally need to work harder as outdoor temperatures fall, which can affect efficiency and electricity consumption during particularly cold weather.

• Regular maintenance required: Like other heating systems, an LG air source heat pump requires appropriate maintenance to help keep it operating safely and efficiently over its lifespan.

LG Heat Pumps vs Other Brands

LG is one of several established manufacturers offering air source heat pumps in the UK. While many brands provide similar core benefits, their systems can differ in areas such as refrigerant, system design, available power outputs, smart controls and installation options.

Here are some of the main differences between LG and other leading heat pump brands:

• LG vs Samsung: Both brands offer air-to-water systems with a range of power outputs and system types. Samsung heat pumps are available through the EHS range, including Mono and Split systems, while LG's THERMA V range includes Monobloc, Split and Hydrosplit options. Both brands also offer smart-home connectivity for compatible systems.

• LG vs Aira: LG manufactures its THERMA V heat pump systems, which are installed through heating professionals, while Aira combines its own heat pump technology with installation and ongoing servicing. Aira heat pumps therefore have a more integrated approach to installation and aftercare compared with LG's manufacturer-focused model.

• LG vs Worcester Bosch: Both manufacturers offer air-to-water heat pumps designed to provide an alternative to traditional boiler heating. Worcester Bosch heat pumps include systems designed around the company's wider heating range, while LG offers several THERMA V configurations, including monobloc, split and hydrosplit systems.

• LG vs Daikin: Both companies have extensive experience in heating and climate technology and offer air-to-water heat pumps for residential properties. Daikin heat pumps are available in several system configurations and refrigerant options, while LG's THERMA V range includes both R32 and R290 models. The specifications and installation requirements can vary between individual models.

• LG vs Vaillant: LG and Vaillant both offer air source heat pumps designed to work with different home heating systems. Vaillant heat pumps, including the aroTHERM range, provide another option for homeowners, while LG offers several THERMA V system formats. Comparing individual models, power outputs, water temperatures and installation requirements can help determine which system is appropriate for a particular property.

Is an LG Air Source Heat Pump Right for Your Home?

An LG air source heat pump could be a suitable heating option if you're looking to replace a gas or oil boiler with a lower-carbon alternative. However, whether it's right for your home will depend on several factors, including your property's size, insulation and existing heating system.

The amount of outdoor space available is also important, as you'll need somewhere suitable to position the heat pump unit. You'll also need enough indoor space for the components required to provide heating and hot water.

Your home's insulation can affect how well a heat pump performs. A well-insulated property will generally retain heat more effectively, helping the system work efficiently. Your radiators and other heating components may also need to be assessed to make sure they're suitable for a heat pump.

The right heat pump model will also depend on your home's heating requirements. LG's THERMA V range includes different system types and power outputs, while other manufacturers offer their own ranges with different features and specifications. A specialist can assess your property and help you understand which options may be suitable.

Ultimately, the best way to determine whether an LG air source heat pump is right for your home is to speak to a qualified specialist. We recommend reaching out to us here at Glow Green for a heat pump quote, where you'll also speak to a heat pump expert who can assess your home, discuss LG and other leading heat pump brands, and help determine which option is suitable for your property.

Want to find out if your home is suitable for a heat pump? Read our guide, Is My Home Suitable for a Heat Pump in the UK?, to learn more about the key factors to consider before installing one.

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