Daikin Altherma 3 vs Samsung EHS

Which Is Better: Daikin Altherma 3 or Samsung EHS?

Neither is better in every case; the choice depends on whether you prefer Daikin’s established R32 Altherma 3 platform or Samsung’s newer R290 EHS proposition. According to Daikin UK’s Altherma 3 catalogue, leaving water temperatures reach up to 65°C, while Samsung Climate Solutions says EHS Mono R290 can deliver water temperatures up to 75°C. See also: BUS Grant 2026 guide.

For homeowners, that means this comparison is really about product strategy and retrofit confidence rather than about one clearly dominating the other. Daikin looks like the more established R32 route. Samsung leans harder into high-temperature R290 messaging. 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 how each system is framed for retrofit. According to Daikin UK’s Altherma 3 literature, the range uses R32 and quotes COP up to 5.1 at 7°C/35°C, while Samsung Climate Solutions says EHS Mono R290 uses refrigerant with GWP 3 and can deliver water temperatures up to 75°C.

The practical comparison looks like this:

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

The useful takeaway is that Daikin offers a very established low-temperature platform, while Samsung is trying to make retrofit feel easier through stronger temperature and refrigerant messaging. That does not make Samsung automatically better, but it does change how the comparison is framed.

That matters most in homes where the homeowner is nervous about radiator capacity or hot-water performance. In more straightforward properties, installer familiarity may matter more than the technical headline.

Which One Usually Fits Retrofit Better?

For retrofit, Samsung often appeals more where homeowners want stronger boiler-replacement reassurance, while Daikin often appeals where a mature R32 route feels proven and flexible. According to Energy Saving Trust (2026), heat pump efficiency still depends on suitable emitters, controls, and insulation, so neither platform removes the need for proper engineering design.

Daikin can be very strong where the installer knows the platform well and can justify the full low-temperature design clearly. Samsung can be attractive where the house is closer to the edge of easy retrofit and the homeowner values the stronger R290 and high-temperature narrative. In either case, the actual decision should come after heat loss, emitter checks, and hot-water design have been tested.

Typical retrofit decision points include:

1. whether the radiators are near the edge of suitability
2. how strongly the homeowner values low-GWP refrigerant
3. which control and support route feels clearer
4. which installer has genuine experience with the chosen platform

There is also a buyer-confidence issue behind the technical data. Daikin often reassures homeowners who want a mature, familiar heating system platform with an established installer base, while Samsung often reassures buyers who worry their radiator system needs stronger high-temperature backup. Those are valid concerns, but they are still concerns about project fit rather than proof that either product wins by default. The stronger quote is the one that demonstrates the required flow temperature and emitter strategy clearly.

What Do Installers and Homeowners Most Often Get Wrong?

The most common mistake is assuming Samsung’s hotter published flow temperature automatically makes it the better retrofit answer. According to MCS (2025), system performance still depends on design, commissioning, and handover quality, so a well-designed Daikin system can outperform a weakly designed Samsung system in real use.

Another mistake is assuming lower-GWP refrigerant automatically means lower bills. Refrigerant matters for product strategy and future-facing environmental profile, but running costs still come back to heat loss, controls, emitter sizing, and how the system is actually operated day to day.

Typical comparison mistakes include:

• choosing on temperature headline alone
• treating refrigerant choice as the whole decision
• ignoring the installer’s real platform experience
• overlooking handover and control setup

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

In London, Surrey, and TW homes, the better choice between Daikin Altherma 3 and Samsung EHS usually depends more on the house and installer than on brand positioning. According to Ofgem (April 2026), electricity remains 24.5p/kWh on the typical direct-debit cap, so poor controls or weak emitter design still affect bills materially regardless of product badge.

For the South East housing stock Electromatic typically sees, the useful question is which route can be justified most clearly. Some properties will genuinely benefit from Samsung’s stronger high-temperature proposition. Others will fit comfortably into a Daikin design if the installer can prove the low-temperature path and support route clearly.

That is why local survey quality matters more than online debate. Our heat pump size calculator guide, heat pump installation process article, and heat pump cost UK guide help make that comparison more practical.

For many homes in the South East, this ends up being a question of discipline rather than technology drama. If the installer can prove the heat-loss numbers, radiator outputs, and hot-water recovery assumptions, either platform can be defensible. If not, neither badge will rescue the project.

How Electromatic Can Help

If you are comparing Daikin Altherma 3 vs Samsung EHS, the next step is a survey that checks heat loss, emitters, hot water, and controls before the product is chosen. According to MCS (2025), compliant heat pump performance depends on documented design and commissioning, not just on which brochure sounds more retrofit-friendly.

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 recommendation rather than a generic product winner. It also makes quote comparison clearer because the scope is tested first.

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

Frequently Asked Questions

Most follow-up questions on Daikin Altherma 3 vs Samsung EHS are really about whether Samsung’s R290 and higher-temperature positioning make it the obvious retrofit winner. According to current manufacturer positioning and MCS principles, the answer remains property-specific because design and commissioning still determine the real result.

How much does refrigerant choice matter here?

It matters if you care about GWP and longer-term product direction. It still does not replace the need for proper heat-loss calculations and emitter checks.

Can Daikin Altherma 3 still work well in retrofit homes?

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

Do I need Samsung because it reaches higher temperatures?

Not necessarily. The better question is what flow temperature your home actually needs to heat efficiently in normal operation.

Is Samsung always better for older radiator systems?

No. Some older homes will suit it well, but radiator performance still depends on overall system design rather than on one product headline.

Which option makes more sense in Surrey and TW homes?

The better option is whichever system your installer can justify most clearly for the property. In South East retrofit work, survey evidence matters more than abstract 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