Home Heat Pump Guide

LG Therma V Heat Pump Review: R290 Models & UK Performance

LG may be best known in the UK for televisions and smartphones, but the South Korean manufacturer has been producing heat pumps and HVAC systems for commercial and residential use worldwide for over two decades. Their Therma V range of air source heat pumps is increasingly popular in the UK market, offering competitive pricing, modern R290 refrigerant technology, and the engineering quality you would expect from a global electronics leader.

This review covers the LG Therma V range available in the UK, including real-world efficiency data, installation costs, smart features, and how they compare to more established heating brands.

LG Therma V Range in the UK

LG offers several Therma V configurations for the UK residential market:

Therma V R290 Monobloc

The R290 monobloc is LG's newest and most future-proof offering. Available in 5.5 kW, 7 kW, 9 kW, 12 kW, and 16 kW outputs, it uses R290 (propane) refrigerant with a GWP of just 3 — the lowest possible for a heat pump refrigerant. The monobloc design contains all refrigerant in the outdoor unit, with only water pipes connecting to the house.

LG quotes an SCOP of up to 4.60 for the R290 monobloc, which is very competitive. The unit features a dual-rotary inverter compressor manufactured by LG themselves — a significant quality advantage as LG is one of the world's leading compressor manufacturers.

Therma V R32 Split

The R32 split system consists of an outdoor unit connected to an indoor hydro unit via refrigerant lines. Available in a wider range of outputs up to 16 kW, the split configuration offers more flexibility for installations where the outdoor unit needs to be placed further from the house.

The R32 models are being gradually superseded by R290 options but remain available and offer good performance. They use LG's established inverter compressor technology and deliver respectable efficiency figures.

Therma V R290 All-in-One

LG also offers an all-in-one solution that integrates the indoor unit and hot water cylinder into a single compact unit. This is particularly useful for properties with limited space, as it eliminates the need for a separate cylinder and wall-mounted indoor module.

Efficiency and Real-World Performance

LG's compressor expertise translates into genuinely good efficiency figures. As one of the world's largest manufacturers of scroll and rotary compressors, LG has deep knowledge of how to optimise refrigerant cycles for maximum heat extraction.

Real-world performance data from UK installations:

  • R290 Monobloc (with UFH, 30-35°C): SCOP of 3.5 to 4.3
  • R290 Monobloc (with radiators, 40-50°C): SCOP of 2.9 to 3.5
  • R32 Split (well-designed system): SCOP of 3.0 to 3.8

These figures are competitive with established European brands. The R290 monobloc in particular performs well, benefiting from propane's superior thermodynamic properties at low outdoor temperatures. UK homeowners report that the units maintain good output and efficiency even during cold snaps, though performance does reduce below -5°C as with any air source unit.

For a typical three-bedroom semi-detached home, annual running costs with an LG Therma V R290 are approximately £700 to £1,000 — placing it alongside brands like Panasonic and Bosch in terms of operational economy.

Installation Costs

LG Therma V heat pumps are competitively priced, which is one of their key selling points. Typical fully installed costs in the UK:

  • Therma V R290 Monobloc (5.5-9 kW): £8,000 to £10,500 (before grants)
  • Therma V R290 Monobloc (12-16 kW): £10,000 to £13,500 (before grants)
  • Therma V R32 Split: £9,000 to £13,000 (before grants)
  • Therma V All-in-One: £10,000 to £14,000 (before grants)

After the £7,500 Boiler Upgrade Scheme grant, net costs range from approximately £500 to £6,500. This positions LG as one of the more affordable routes to a quality R290 heat pump, undercutting European brands like Nibe and Viessmann while offering comparable technology.

Build Quality and LG's Engineering Heritage

LG is a global manufacturing powerhouse with revenues exceeding £40 billion annually. Their HVAC division has been producing commercial and residential heating and cooling systems for over 30 years, and the Therma V range benefits from this industrial scale and experience.

Key quality features include:

  • In-house compressors: LG manufactures their own dual-rotary inverter compressors, which are used across their HVAC range and have an excellent reliability record
  • Gold Fin coating: The heat exchanger coils use LG's proprietary Gold Fin anti-corrosion coating, which is more durable than standard coatings and well-suited to UK weather
  • Robust casing: The outdoor units are built to withstand exposure and are well-protected against moisture and frost
  • Quality control: LG operates to rigorous global manufacturing standards across their facilities

The units feel well-made and solidly constructed. Installer feedback is generally positive, with engineers noting that the units are logically laid out and straightforward to commission.

Smart Controls: LG ThinQ

LG heat pumps integrate with the LG ThinQ app, which provides:

  • Remote control of heating schedules and hot water
  • Real-time energy monitoring and COP display
  • Error notifications and diagnostic information
  • Weekly and monthly energy reports
  • Voice control via Google Assistant and Amazon Alexa
  • Integration with LG's broader smart home ecosystem

The ThinQ platform benefits from LG's experience in consumer electronics — the app is polished, responsive, and well-designed. Energy monitoring is detailed enough to be genuinely useful, and the integration with voice assistants is a nice touch for tech-savvy households.

However, the ThinQ system does not currently offer the smart tariff integration found in Nibe's myUplink, which means you cannot automatically optimise heating around variable electricity pricing. This is likely to be added in future firmware updates as the feature becomes more common.

Noise Performance

The Therma V R290 monobloc is impressively quiet, operating at around 35 dB(A) at one metre in low-power mode. This makes it one of the quieter heat pumps available in the UK and means it can be installed in most positions without noise concerns.

At full output, noise rises to approximately 48 dB(A), which is competitive with the market average. LG's inverter compressor technology ensures the unit spends most of its time running at partial load (and therefore lower noise) rather than cycling between full power and off.

Growing UK Presence

LG has been steadily building their UK heat pump presence. Their HVAC division has a UK headquarters, training facilities, and a growing network of trained installers. While their installer base is not yet as extensive as Worcester Bosch or Grant, it has expanded significantly and most areas of England and Scotland now have LG-trained installers available.

LG provides good technical support through their UK team, and their global supply chain means parts availability is generally reliable. As the UK heat pump market grows, LG's investment in their UK operation is likely to continue expanding.

Warranty

LG offers a standard 5-year warranty on Therma V heat pumps, with extended warranty options available through authorised installers. The compressor carries a separate extended warranty of up to 10 years in some programmes.

Given LG's track record with compressor reliability across their broader HVAC range, the warranty terms are reasonable. Annual servicing is required to maintain coverage.

Pros and Cons of LG Therma V Heat Pumps

Advantages

  • Competitive pricing: Good R290 technology at a lower price than many European brands
  • Own compressors: LG's in-house dual-rotary compressors are proven and reliable
  • R290 refrigerant: Future-proof with the lowest possible GWP
  • Quiet operation: Amongst the quietest monobloc units available
  • Good smart controls: ThinQ app is polished and functional
  • Anti-corrosion coating: Gold Fin technology suits UK weather conditions
  • All-in-one option: Space-saving integrated solution available

Disadvantages

  • Smaller installer network: Still growing compared to established heating brands
  • Brand perception: Not traditionally associated with home heating in the UK
  • No smart tariff integration: Cannot yet optimise for variable electricity pricing
  • Newer to UK market: Less long-term UK performance data than established brands
  • Limited ground source: Air source only — no GSHP option

Who Should Choose an LG Therma V?

The LG Therma V is an excellent choice for homeowners who want modern R290 technology and good smart features at a competitive price. They are particularly well suited to:

  • Budget-conscious homeowners who still want R290 refrigerant technology
  • Tech-savvy households who will use the ThinQ smart features
  • Properties where quiet operation is important
  • Coastal homes where LG's anti-corrosion coating is valuable
  • Homes with limited space where the all-in-one option is attractive

If installer availability is your primary concern, Worcester Bosch has a wider network. If you want the most advanced energy optimisation, Nibe leads the field. But LG offers a compelling package that balances modern technology, quality, and affordability. For the full picture, see our complete UK manufacturer guide.

Frequently Asked Questions

Are LG Therma V heat pumps any good?

Yes, LG Therma V heat pumps are good quality products backed by LG's extensive HVAC and compressor manufacturing expertise. The R290 monobloc models are particularly competitive, offering modern technology at a keen price point. They are quieter than average and come with well-designed smart controls.

How much does an LG Therma V cost in the UK?

A fully installed LG Therma V R290 monobloc costs between £8,000 and £13,500 before grants. After the £7,500 Boiler Upgrade Scheme grant, the net cost is typically £500 to £6,000.

What refrigerant does the LG Therma V use?

The newest Therma V models use R290 (propane), which has a global warming potential of just 3 — the lowest available for heat pumps. Older models use R32. The R290 models are recommended for future-proofing against tightening F-Gas regulations.

Is LG better than Daikin for heat pumps?

Both are major Asian manufacturers with strong HVAC heritage. LG's newer R290 models are more future-proof than Daikin's current R32 offerings, and LG is typically slightly cheaper. Daikin has a longer track record in the UK heating market and a somewhat larger installer network. Efficiency is comparable between the two brands.

How quiet is the LG Therma V?

The Therma V R290 monobloc operates at around 35 dB(A) at one metre in quiet mode — one of the lowest figures in the market. This is comparable to a whispered conversation and well within Permitted Development noise limits for most installation positions.

Does LG make their own compressors?

Yes, LG manufactures their own dual-rotary inverter compressors. LG is one of the world's largest compressor manufacturers, and this in-house capability gives them full control over the most critical component in the heat pump system.