Samsung EHS vs Daikin Altherma 3

Which Is Better: Samsung EHS or Daikin Altherma 3?

Neither is better for every home; the right choice depends on whether Samsung’s R290 EHS route or Daikin’s Altherma 3 route better suits your retrofit. According to Samsung Climate Solutions, EHS Mono R290 can provide up to 75°C hot water, while Daikin says Altherma 3 uses R32, reaches 65°C leaving water temperature, and quotes COP up to 5.1 at 7°C/35°C. See also: BUS Grant 2026 guide.

For most homeowners, that means this is a comparison between a newer high-temperature R290 proposition and a mature low-temperature R32 proposition. Samsung often looks stronger where high-temperature reassurance and connected controls matter. Daikin often looks stronger where the installer trusts a proven low-temperature platform and the property can be designed honestly around it. 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 refrigerant, temperature positioning, and the overall retrofit philosophy. According to Samsung Climate Solutions, EHS Mono R290 is framed as a higher-temperature R290 solution with SmartThings integration, while Daikin says Altherma 3 is a mature R32 low-temperature platform with seasonal efficiency up to A+++ at 35°C.

The practical comparison looks like this:

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

That means Samsung often looks more future-facing and more appealing to buyers who want a stronger boiler-replacement narrative. Daikin often looks more convincing where the installer wants to defend a properly engineered lower-temperature design. In practice, the better answer still depends on heat loss, emitters, hot water, and how honestly the property is being assessed.

Which One Usually Fits Retrofit Better?

For retrofit, Samsung often feels stronger where the house is older or more radiator-constrained, while Daikin often feels stronger where the home can be designed clearly around lower flow temperatures. According to Energy Saving Trust (2026), heat pumps still work best with suitable emitters, correct controls, and enough insulation.

Samsung can be attractive where the installer wants to lean on 75°C and a more direct replacement message for a gas boiler. Daikin can be very strong where the home is a credible lower-temperature candidate and the installer already knows the Altherma route well. Neither route removes the need for radiator checks, cylinder design, or honest room-by-room sizing. In South East retrofits, those fundamentals still matter more than refrigerant marketing.

Typical retrofit decision points include:

1. whether the radiators sit near the edge of suitability
2. whether high-temperature reassurance matters to the buyer
3. how comfortable the installer is with Samsung or Daikin
4. whether the quote explains hot water and optimisation clearly

What Do Homeowners Most Often Get Wrong?

The most common mistake is assuming Samsung’s R290 and 75°C headline automatically make it the better retrofit answer. According to MCS (2025), actual performance depends on design, commissioning, and handover quality, so a well-delivered Daikin route can outperform a weak Samsung route in real use.

Another mistake is treating refrigerant as the whole comparison. Refrigerant matters for product direction and environmental profile, but it does not replace radiator outputs, cylinder sizing, or weather-compensated controls. Buyers also sometimes assume a more mature lower-temperature platform is old-fashioned or weaker. In practice, it can be exactly the right answer if the building suits it and the installer can defend it properly.

Typical comparison mistakes include:

• choosing on refrigerant or temperature headline alone
• treating higher water temperature as proof of better fit
• ignoring the installer’s preferred platform
• overlooking optimisation after handover

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

In London, Surrey, and TW homes, the better choice between Samsung EHS and Daikin Altherma 3 usually depends more on the survey and installer than on the product logo. According to Ofgem (April 2026), electricity is 24.5p/kWh on the typical direct-debit cap, so poor controls or weak emitters still affect running costs materially.

For many ordinary South East homes, Daikin often makes sense where the project can be designed confidently around lower flow temperatures. Samsung often becomes more attractive where the owner wants stronger high-temperature reassurance and a more connected-home controls story. The better route is the one supported by heat-loss numbers and room-by-room design, not the one with the more persuasive headline feature.

That is why local design work matters more than generic product rankings. Our heat pump size calculator guide, heat pump installation process article, and heat pump cost UK guide help make this a grounded comparison.

Another practical difference is buyer expectation after installation. Samsung is often chosen by owners who want stronger reassurance around older radiators and app-led control, while Daikin is often chosen by owners happy with a more disciplined low-temperature design provided the quote is explicit. The better outcome usually comes from matching that expectation to the actual building rather than stretching either platform beyond what the survey supports. That usually reduces disappointment after handover because the system is being judged against the right design brief from the start and the expected operating style in day-to-day use.

How Electromatic Can Help

If you are comparing Samsung EHS vs Daikin Altherma 3, the next step is a survey that checks heat loss, emitters, hot water, controls, and layout before the product is chosen. According to MCS (2025), compliant heat pump performance depends on documented design and commissioning rather than on product messaging alone.

Electromatic can show where each route makes practical sense for London and Surrey housing stock and whether the 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 rather than a narrow R290-versus-R32 argument. It also makes quote comparison easier because the real assumptions are visible before you commit. That usually improves decisions on emitters, controls, and scope.

Book your free home survey →

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

Frequently Asked Questions

Most follow-up questions on Samsung EHS vs Daikin Altherma 3 are really about whether the newer R290 route automatically beats the mature R32 route. According to current manufacturer positioning and MCS principles, the answer remains property-specific because design and commissioning still decide results.

How much does Samsung’s R290 refrigerant matter?

It matters if lower GWP and a more future-facing product direction are important to you, but it still does not replace proper system design.

Can Daikin still work well in retrofit homes?

Yes. In many homes it can be a very strong answer if the installer can justify the full low-temperature design clearly.

Does Samsung suit harder retrofits better?

Sometimes it can, especially where stronger temperature reassurance helps the installer justify the design, but the property still decides.

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.

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 for your property. Survey evidence matters more than brochure claims.

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