Quick answer: An LG heat pump is a capable, efficient option for many homes. The current Therma V R290 Monobloc runs on natural R290 refrigerant, delivers flow temperatures of up to 75°C, and LG’s UK product pages list SCOP figures of 5.11 to 5.45 at 35°C. The bigger question with LG is less about the hardware and more about after-sales support, so choose your installer carefully.
LG is best known for TVs and washing machines, so it surprises a few people when we mention its heat pumps. In fact, LG has sold Therma V heat pumps in the UK for years. This review is based on LG’s own UK product pages and press releases, plus independent sources, written the way I’d explain it on a survey visit.
LG Heat Pump Review: At a Glance
The LG Therma V R290 Monobloc is the model to look at for most homes: natural refrigerant, sizes from 7kW to 16kW, and water up to 75°C. Here are the headline figures.
| Feature | LG Therma V R290 Monobloc |
|---|---|
| Brand | LG (LG Electronics) |
| Main domestic range | Therma V R290 Monobloc |
| Sizes | 7kW, 9kW, 12kW, 14kW and 16kW |
| Refrigerant | R290 (propane), GWP of 3 |
| Maximum flow temperature | Up to 75°C for heating (80°C for hot water) |
| SCOP at 35°C | 5.11 to 5.45 (ErP A+++) |
| SCOP at 55°C | 3.75 to 3.97 (ErP A++ to A+++) |
| Heating operating range | Down to -28°C outdoors |
| Outdoor sound power | 49 to 52 dB(A), Quiet Mark accredited models |
| Indoor options | Control unit, hydro unit or combi unit (with built-in tank) |
| App | LG ThinQ, plus LG BECON cloud for installer remote support |
| Warranty | 3 years standard, up to 7 years extended via an LG-trained installer |
| Home Energy Scotland grant | Up to £7,500 (£9,000 with the rural/island uplift) |
| Best for | Medium to large homes, including older properties with existing radiators |
Is an LG Heat Pump Worth It?
Yes, an LG heat pump can be well worth it, especially the R290 Monobloc. On paper it competes with the best: high SCOP figures, a 75°C flow temperature and a low-impact refrigerant. The catch is that LG’s heating installer network is smaller than some long-established heating brands, so it pays to check who will look after it.
I’ll be honest about the “electronics brand” question, because it’s the one I get asked most. LG has a big air conditioning business, and a heat pump is really an air conditioner run in reverse with a water circuit attached, so the engineering pedigree is there. Where it can feel different is after the sale: how many engineers know the product, how quickly parts arrive, and whether your installer has a direct line to LG.
Which? has published brand data showing LG with roughly 250 to 300 accredited installers in the UK. That’s a reasonable number, but spread across the whole country it means fewer specialists in any one area than you’d find for a brand like Mitsubishi. LG has tried to close that gap with its BECON cloud system, which lets an installer or service partner check settings, monitor the unit and update firmware remotely, without a site visit. For homes out in the Borders or rural Perthshire, that remote access could save a long wait.
The other thing I like is the monobloc design. All the R290 refrigerant stays sealed inside the outdoor unit, along with the plate heat exchanger, pump and safety components. Only water pipes come into the house, so there’s no refrigerant pipework to run through your walls.
Pros and Cons of LG Heat Pumps
| Pros | Cons |
|---|---|
| R290 natural refrigerant with a GWP of just 3 | Smaller specialist installer network than some heating-first brands |
| Up to 75°C flow temperature for older radiator systems | The 7-year warranty depends on using an LG-trained installer |
| High SCOP figures, up to 5.45 at 35°C on the 12kW | Large outdoor units: the 9kW to 16kW models are 1,560mm wide and weigh 181kg |
| Heats down to -28°C outdoors | No small 4kW or 5kW R290 model for very low heat loss homes |
| Quiet: 49 dB(A) sound power on the 7kW, 9kW and 12kW | LG’s UK pages list several three-phase versions, so check the exact model suits your supply |
| Remote installer support and firmware updates through BECON cloud | No heat pump specific Trustpilot or Which? reliability score to lean on |
How Efficient Are LG Heat Pumps?
LG heat pumps are very efficient on paper. LG’s UK product pages list SCOP figures of up to 5.45 at a 35°C flow, meaning roughly five and a half units of heat for every unit of electricity across a typical year. At a 55°C flow, closer to what many older radiator systems need, the figures sit between 3.75 and 3.97.
SCOP stands for seasonal coefficient of performance. The higher it is, the less electricity you buy. Here’s how the R290 range lines up, with the older R32 Monobloc S for comparison.
| Model | SCOP 35°C | SCOP 55°C | ErP rating (35°C / 55°C) | Outdoor sound power |
|---|---|---|---|---|
| R290 Monobloc 7kW (HM071HF) | 5.24 | 3.86 | A+++ / A+++ | 49 dB(A) |
| R290 Monobloc 9kW (HM093HFX) | 5.23 | 3.75 | A+++ / A++ | 49 dB(A) |
| R290 Monobloc 12kW (HM123HF) | 5.45 | 3.97 | A+++ / A+++ | 49 dB(A) |
| R290 Monobloc 14kW (HM143HF) | 5.38 | 3.96 | A+++ / A+++ | 51 dB(A) |
| R290 Monobloc 16kW (HM163HF) | 5.11 | 3.92 | A+++ / A+++ | 52 dB(A) |
| R32 Monobloc S 7kW (older model) | 4.37 | 3.1 | n/a | 57 dB(A) |
That jump from the R32 Monobloc S to the R290 Monobloc is significant. At 55°C, the R290 models are around 20% to 28% more efficient on paper, and they’re quieter too.
Here’s what that means in money. With electricity at around 26p/kWh under the Ofgem price cap for 1 October to 31 December 2026, an LG 12kW running at its 55°C SCOP of 3.97 makes heat for roughly 6.5p per kWh. A 90% efficient gas boiler, with gas at around 8p/kWh, works out at nearly 9p per kWh of heat. Bring the flow temperature down towards 35°C and the heat pump’s cost drops below 5p. These are unit-rate sums only, ignoring standing charges, and real-world figures depend on your home and how the system is designed. Our guide to heat pump running costs in Scotland goes into more detail.
LG Air Source Heat Pump Models
LG’s current air-to-water range for homes is the Therma V R290 Monobloc. Older Therma V models on R32 refrigerant are no longer the headline products, but plenty are still in service and you may see them in quotes or on a house you’re buying.
| Model | Refrigerant | Sizes (kW) | Max flow temp | Notes |
|---|---|---|---|---|
| Therma V R290 Monobloc (compact) | R290 | 7, 9 | 75°C | Launched at IFA 2024 with an updated compressor. Single fan, sized to fit under most windows. The 7kW outdoor unit measures 1,320 x 1,019 x 520mm and weighs 130kg |
| Therma V R290 Monobloc | R290 | 9, 12, 14, 16 | 75°C | Introduced in late 2023. Outdoor unit 1,560 x 1,019 x 520mm, 181kg. The 12, 14 and 16kW come in single and three-phase versions; this larger 9kW is three-phase |
| Therma V R32 Monobloc / Monobloc S (older) | R32 | 5 to 16 (single phase), 12 to 16 (three phase) | 65°C | Earlier monobloc range; 65°C without an electric heater |
| Therma V R32 Split and Hydrosplit (older) | R32 | 5 to 9 (Split), 12 to 16 (Hydrosplit) | 65°C | Refrigerant pipework runs between outdoor and indoor units |
Every R290 Monobloc outdoor unit pairs with one of three indoor options:
- Control unit: a slim wall-mounted controller, used with a separate hot water cylinder.
- Hydro unit: a wall-hung unit (490 x 850 x 315mm, about 31kg) with a backup heater, again used with a separate cylinder.
- Combi unit: a floor-standing unit with a built-in hot water tank, handy where there’s no space for a separate cylinder.
LG says the R290 Monobloc can produce 75°C water at -15°C outside and keeps heating down to -28°C. At that very low end, LG notes the leaving water may be limited to 50°C with reduced output, which is why proper sizing matters. Our guide on what size heat pump you need explains how we work that out.
The LG ThinQ App
LG heat pumps work with the LG ThinQ app, the same app LG uses for its washing machines and fridges. You can adjust temperatures and watch energy use in real time. A Wi-Fi modem is needed for the app and for BECON remote support, so make sure your installer includes it.
How Much Does an LG Heat Pump Cost?
The Energy Saving Trust puts the typical cost of installing an air source heat pump at around £14,000 before grants, and an LG system will usually sit somewhere around that. Your final figure depends on the size, the indoor unit and cylinder, and how much radiator and pipework upgrading your home needs. We fix the price after a survey.
For a sense of the hardware alone, Which? lists an RRP of £3,871 for the older 7kW R32 Monobloc S outdoor unit. That excludes the cylinder, controls, radiators, electrics, commissioning and labour, which together make up most of a full installation.
Scottish homeowners get good support with the cost:
- Home Energy Scotland grant: up to £7,500 towards an air-to-water heat pump, or £9,000 with the rural and island uplift. You must have a written offer before any work starts, and both the installer and the product must be MCS certified.
- Home Energy Scotland loan: an optional interest-free loan of up to £7,500 on top of the grant.
- Warm Homes Loan Scheme: low and zero-interest loans of up to £20,000 for an air-to-water heat pump, with some terms up to 30 years. It can be combined with the Home Energy Scotland grant, and we’re part of the scheme.
The Boiler Upgrade Scheme you may have read about only covers England and Wales, so it doesn’t apply in Scotland. Our Home Energy Scotland grant and loan guide explains the application, and there’s more on the Warm Homes Loan Scheme in Scotland here. For a wider look at pricing, see how much a heat pump costs.
What Property Types Suit an LG Heat Pump?
An LG Therma V R290 Monobloc suits medium to large homes best, including older properties with existing radiators. The range starts at 7kW, so very small or super-insulated homes may be better served by a brand with a smaller unit.
Here’s how I’d match the sizes up:
- Semis and terraces: the 7kW or 9kW compact models are a good fit for the 1930s semis and ex-council homes we see in Dalkeith, Livingston and Kirkcaldy.
- Older stone-built homes: the 75°C flow temperature gives breathing room with existing radiators in Edinburgh villas and older houses in Linlithgow or Stirling. Some radiators may still need upgrading so the system can run cooler. Our guide on whether you need new radiators covers this.
- Large or rural homes: the 12kW, 14kW and 16kW models cover bigger detached houses and farmhouses in the Borders or around Perth. The 14kW still gives 13kW at -7°C outside on LG’s figures.
- Tenement flats: often tricky for any monobloc, as the outdoor unit needs a suitable spot. We look at these case by case.
Outdoor space is the big one with LG. The 9kW to 16kW units are 1,560mm wide and over a metre tall, and at 181kg they need a solid base. Because they use R290, they also need enough clearance from windows, doors and drains. Our guide to heat pump location rules explains what’s involved. On the plus side, the sound power is only 49 to 52 dB(A), and LG lists a sound pressure of 27 dB(A) at 5 metres for the 9kW and 12kW. That’s quiet, which helps with neighbours. See our guide to heat pump noise for context.
LG Heat Pump Maintenance Requirements
An LG heat pump should be serviced once a year by a qualified heat pump engineer. Regular servicing keeps it efficient and is normally a condition of any extended warranty, so keep your records safe.
A typical yearly service includes:
- Cleaning the water filter and checking flow rates
- Checking system pressure and the expansion vessel
- Clearing leaves and debris from around the outdoor unit and checking the coil
- Checking controls, sensors, software settings and the Wi-Fi connection
The monobloc design helps here. Engineers reach the internals through a side panel, and the refrigerant comes pre-charged, with no refrigerant pipework made on site. Between visits, just keep the outdoor unit clear of snow and leaves.
On warranty, LG offers a 3-year standard warranty, extendable up to 7 years when the system is fitted by an installer who has completed LG’s training. Always ask your installer which level you’ll get and make sure the system is registered. If you’d like us to look after your system, see our heat pump aftercare options.
What Are the Ratings for LG Heat Pumps?
There’s no independent, heat pump specific customer rating for LG that I’d rely on. The Trustpilot profile covers all of LG’s UK products, and Which? has published LG product data but not a heat pump reliability score.
Trustpilot
LG’s claimed Trustpilot profile (lg.com) is dominated by reviews of washing machines, fridges and TVs. Only a very small number mention heat pumps, so the overall score tells you little about the Therma V. I’d put far more weight on your installer’s own reviews.
Which?
Which? includes LG in its heat pump buying guide brand table, listing the older Therma V 7kW R32 Monobloc S with a 3-year standard and 7-year extended warranty, a performance guarantee and 250 to 300 UK accredited installers. Which? hasn’t published a reliability score for LG heat pumps.
How Does LG Compare?
LG compares well on specification with Samsung and Mitsubishi. All three now offer R290 heat pumps with 75°C flow temperatures; the differences are in sizes, unit bulk and installer support.
- LG vs Samsung: Samsung’s EHS Mono R290 also reaches 75°C and comes in 5, 8, 12 and 16kW, so it covers smaller homes that LG’s 7kW starting point doesn’t. LG’s published SCOPs are higher on paper. Read our Samsung heat pump review for the full picture.
- LG vs Mitsubishi Ecodan: the Ecodan R290 runs from 5kW to 12kW at up to 75°C, in a noticeably smaller and lighter outdoor unit, and it’s made in Livingston, West Lothian. LG goes up to 16kW, which helps bigger homes. Our Mitsubishi Ecodan review covers it in detail.
Is an LG Heat Pump Right for You?
An LG heat pump is right for you if you want a high-efficiency R290 system with plenty of output for a medium or large home, and you have room outside for a fairly big unit. It’s less suited to small, very well insulated homes or anyone who wants a warranty without conditions.
Choose LG If…
- You want R290 refrigerant with a GWP of just 3
- Your home has older radiators and you’d value up to 75°C flow temperature
- You need a larger output, up to 16kW, for a bigger or draughtier home
- You like the idea of remote diagnostics and firmware updates through BECON cloud
- You already use the LG ThinQ app for other appliances
Don’t Choose LG If…
- Your home only needs around 4kW to 5kW, as LG’s R290 range starts at 7kW
- You have limited outdoor space for a unit up to 1,560mm wide
- You can’t find an LG-trained installer to unlock the extended warranty
- You actually want air-to-air heating, which isn’t eligible for the Home Energy Scotland grant (we now fit air-to-air systems too, so just ask)
Get a Free Heat Pump Quote From The Edinburgh Boiler Company
If an LG heat pump sounds like a good fit, or you’d like to compare it with other brands, we’d be happy to help. As one of Scotland’s leading MCS-certified heat pump installers, we’ll survey your home, work out the right size, and give you a fixed price. We’ll also help with your Home Energy Scotland grant and loan application, and as part of the Warm Homes Loan Scheme we can talk you through low-interest finance.
We cover Edinburgh, Musselburgh, Dalkeith, Penicuik, Livingston, Bathgate, Linlithgow, Falkirk, Stirling, Dunfermline, Kirkcaldy, Perth, Glasgow and the Borders. Book your free heat pump survey or find out more about our heat pump installation service.
LG Heat Pump FAQs
Is LG a good heat pump brand?
Yes. LG’s Therma V R290 Monobloc has strong published efficiency, up to 75°C flow temperatures and natural refrigerant. As with any brand, the quality of the system design and installation matters just as much as the unit itself.
What is the LG Therma V R290?
It’s LG’s current air-to-water monobloc heat pump, using R290 (propane) refrigerant with a GWP of 3. It comes in 7kW to 16kW sizes, produces water up to 75°C and pairs with a control, hydro or combi indoor unit.
Who makes LG heat pumps?
LG Electronics, the South Korean company behind LG’s TVs and appliances. Its heat pumps come from its air conditioning and heating business.
Can an LG heat pump work with my existing radiators?
Often, yes. The R290 Monobloc can run at up to 75°C, which helps with existing radiators. It’s most efficient at lower temperatures, though, so we check every room’s heat loss and may suggest upgrading a few radiators.
How long is the LG heat pump warranty?
LG’s standard warranty is 3 years, extendable up to 7 years when an LG-trained installer fits the system. Check the terms and registration with your installer before work starts.
Does an LG heat pump work in a Scottish winter?
Yes. LG says the R290 Monobloc keeps heating down to -28°C and can make 75°C water at -15°C. Correct sizing for your home is what keeps it comfortable on the coldest days.
Is an LG heat pump eligible for the Home Energy Scotland grant?
Yes, if the exact model is MCS certified, it’s fitted by an MCS-certified installer and it provides all your heating and hot water. You need a written grant offer before any work starts. Use our grant checker to see what you could get.
