LG THERMA V vs Samsung EHS

Which Is Better: LG THERMA V or Samsung EHS?

Neither is better in every case; the choice depends on which R290 ecosystem and controls route better fits your project. According to LG’s 2024 and 2026 product announcements, THERMA V R290 is now offered in 7kW, 9kW, 12kW, 14kW and 16kW classes, while Samsung says EHS Mono R290 is available in 5kW, 8kW, 12kW and 16kW outputs. See also: BUS Grant 2026 guide.

For most homeowners, that means this is less about headline temperature and more about product route, installer familiarity, and how clearly the system is being explained. Both brands are pushing hard into R290 and European retrofit demand. The better answer usually comes from design quality rather than from a simple “LG or Samsung” preference. Read our complete guide to heat pumps in the UK, best heat pump brands guide, and heat pump running costs article. If your property is eligible, our BUS grant survey page is the route for domestic ASHP applications, subject to eligibility.

What Are the Main Technical Differences?

The main differences are output spread, controls, and how each manufacturer frames performance for European homes. According to LG, THERMA V R290 uses refrigerant with GWP 3 and has expanded into small and medium capacities, while Samsung says EHS Mono R290 also uses refrigerant with GWP 3 and is sold in 5kW to 16kW outputs.

The practical comparison looks like this:

Prices and services correct at time of writing — always request a current quote.

That means the brochure comparison is fairly close. Both are trying to look like modern, low-GWP, retrofit-capable alternatives to older R32 propositions. The difference usually comes from who is installing the system, what controls and support route are included, and whether the house really needs the product story being sold.

There is also a practical buying angle behind the specifications. A stronger quote with clearer emitter allowances, cylinder assumptions, and commissioning detail is usually worth more than broader global brand confidence on its own. That is especially true when the property sits near the edge of easy retrofit.

Which One Usually Fits Retrofit Better?

For retrofit, Samsung often appeals where homeowners want a more boiler-replacement-style narrative, while LG often appeals where buyers are comfortable with its broader heating system ecosystem. According to Energy Saving Trust (2026), heat pumps still perform best with suitable emitters, controls, and insulation, so neither product removes the need for proper design work.

LG can be a strong answer where the installer knows the THERMA V range well and the project benefits from its wider European positioning and newer small-to-medium R290 capacities. Samsung can be a strong answer where the homeowner likes its output spread from 5kW upward and wants a recognisable climate-tech route. In both cases, radiator performance, cylinder setup, and control logic matter more than broad claims about which multinational brand is “safer”.

Typical retrofit decision points include:

1. which platform the installer genuinely prefers to commission
2. whether the property needs smaller or larger output options
3. how much confidence the controls route gives the homeowner
4. whether the quote explains emitters and hot water clearly

What Do Installers and Homeowners Most Often Get Wrong?

The most common mistake is assuming that two R290 product families with similar outputs will behave identically in real homes. According to MCS (2025), actual performance still depends on design, commissioning, and handover quality, so the delivery route matters more than broad claims about refrigerant or technology category.

Another mistake is comparing brand ecosystems without comparing the installer. A homeowner can be sold a strong LG or Samsung product story and still receive a weak survey, under-explained controls, or a thin radiator allowance. That is where projects go wrong. People also overestimate how much a smart app can compensate for a poorly set weather compensation curve or an over-optimistic flow temperature assumption. It cannot.

Typical comparison mistakes include:

• assuming shared R290 positioning means shared outcomes
• choosing on global brand familiarity alone
• ignoring the installer’s actual experience with the chosen platform
• overlooking commissioning and optimisation scope

What Does This Mean in London, Surrey, and TW Homes?

In London, Surrey, and TW homes, the better choice between LG THERMA V and Samsung EHS usually depends more on installer confidence and house type than on headline branding. According to Ofgem (April 2026), electricity is 24.5p/kWh on the typical direct-debit cap, so poor settings or weak emitters still turn directly into higher running costs.

For the South East housing stock Electromatic commonly sees, the winning route is usually the one that makes the design easiest to defend. If one installer can clearly prove the flow temperature, radiator outputs, and cylinder recovery assumptions on LG, that may be the better route. If another can prove the same more clearly on Samsung, that may be the stronger answer instead. In practice, the clarity of the engineering beats the colour of the logo.

That is why local survey work matters more than forum preferences. Our heat pump size calculator guide, heat pump installation process article, and heat pump cost UK guide help turn this into a grounded decision.

How Electromatic Can Help

If you are comparing LG THERMA V vs Samsung EHS, the next step is a survey that checks heat loss, emitters, hot water, and controls before the platform is chosen. According to MCS (2025), compliant heat pump performance depends on documented design and commissioning rather than on brand positioning alone.

Electromatic can show where each route makes practical sense for London and Surrey housing stock and whether the wider project should also include solar PV or battery storage planning. We work under MCS certification via our accredited umbrella partner, and where the installation is eligible we can handle BUS grant applications for air source heat pumps, subject to eligibility. We can also coordinate ASHP and solar through one contractor.

That gives you a property-specific answer instead of a multinational brand debate. It also makes quote comparison cleaner because the design route is visible before you commit.

That usually saves time, because the product choice is being made inside a proven scope rather than ahead of it.

Book your free home survey →

Call us: 07718 059 284 | Email: admin@electromatic.uk

Frequently Asked Questions

Most follow-up questions on LG THERMA V vs Samsung EHS are really about whether one R290 route is automatically better for retrofit. According to current manufacturer positioning and MCS principles, the answer remains property-specific because design, emitters, and commissioning still decide results.

How much does output range matter here?

It matters if your property sits near the lower or upper edge of common domestic heat losses. For many homes, installer experience still matters more.

Can both systems work with existing radiators?

Sometimes yes, but only if the radiators are genuinely suitable or can be upgraded sensibly as part of the design.

Is LG stronger because of its expanded R290 lineup?

It can be attractive, especially for certain capacities, but output availability alone does not decide real-world performance.

Is Samsung more retrofit-friendly?

Sometimes it is marketed that way, but the real answer depends on the property and how clearly the installer proves the design.

Which option makes more sense in Surrey and TW homes?

The better option is whichever route your installer can size, explain, and support most clearly. In South East retrofit work, evidence beats badge preference.

The information in this article is for general guidance only and does not constitute financial, legal, or technical advice. Energy savings estimates are based on typical UK household data from the Energy Saving Trust and Ofgem (April 2026 price cap). Actual savings depend on your property type, insulation levels, energy usage patterns, and electricity tariff. The Boiler Upgrade Scheme (BUS) grant of £7,500 is subject to eligibility criteria set by Ofgem — not all properties qualify. Electromatic M&E Ltd operates under MCS certification via an accredited umbrella partner. All installations comply with Building Regulations Part L and MCS standards. E&OE.

Written by Electromatic M&E Ltd — ASHP & Solar installer, London & Surrey (electromatic.uk)

Last updated: April 2026 | Electromatic M&E Ltd, Company No. 13837345