Grant Aerona3 vs Samsung EHS

Which Is Better: Grant Aerona3 or Samsung EHS?

Neither is better by default; the choice depends on whether you prefer Grant’s established R32 Aerona3 range or Samsung’s newer R290 EHS proposition. According to Grant UK’s Aerona3 brochure, outputs run from 4kW to 17kW with SCOP values from 3.29 to 3.72, 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 is really a comparison between two different retrofit stories. Grant reads as a mainstream domestic heat pump range with broad outputs. Samsung leans harder into low-GWP refrigerant and higher-temperature reassurance. 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, maximum temperature positioning, and how each brand is framed for retrofit. According to Grant UK’s Aerona3 brochure, Aerona3 uses R32 and quotes SCOP figures between 3.29 and 3.72, while Samsung Climate Solutions says EHS Mono R290 uses refrigerant with GWP 3 and can provide hot water up to 75°C for heating applications.

The practical comparison looks like this:

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

These numbers do not create a one-line winner because they come from different product families and test contexts. The useful takeaway is that Grant offers a broad domestic range, while Samsung is clearly using R290 and higher flow temperatures to make retrofit feel less risky.

That matters most in homes where radiator suitability, hot-water demand, and homeowner confidence are close to the edge of an easy low-temperature design. In simpler houses, installer competence will usually matter more than the product story.

There is also a handover and expectation-management angle. Grant often suits homeowners who want a conventional domestic-heating discussion with less emphasis on product theatre and more emphasis on straightforward sizing, controls, and cost clarity. Samsung often suits buyers who are explicitly looking for low-GWP refrigerant and a stronger boiler-replacement narrative. Neither route guarantees a better outcome, but the homeowner’s priorities do influence which explanation feels more credible and which quote structure feels easier to trust.

Which One Usually Fits Retrofit Better?

For retrofit, Samsung often appeals more where homeowners want R290 and stronger high-temperature reassurance, while Grant often appeals where a straightforward mainstream route is enough. According to Energy Saving Trust (2026), heat pumps still perform best with suitable emitters, controls, and insulation, so neither system removes the need for proper design work.

Grant can make sense where the house is a relatively conventional low-temperature candidate and the installer can prove the numbers clearly. Samsung can make sense where the homeowner is nervous about replacing a boiler in an older property and wants a stronger retrofit narrative. In both cases, the better answer still depends on heat loss, emitters, and hot-water design rather than on marketing confidence.

Typical retrofit decision points include:

1. whether the existing radiators are near capacity
2. how much hot-water performance the household expects
3. whether low-GWP refrigerant is a major priority
4. which installer can explain the full system credibly

What Do Installers and Homeowners Most Often Get Wrong?

The most common mistake is assuming Samsung’s hotter R290 positioning automatically makes Grant the weaker retrofit option. According to MCS (2025), system performance still depends on design, commissioning, and handover quality, so a well-designed Grant installation can outperform a poorly designed Samsung one.

Another mistake is treating refrigerant choice as the whole decision. R290 matters, especially for environmental profile and product direction, but it does not decide radiator capacity, cylinder performance, or how well the controls are set up. Those are the things that shape day-to-day comfort and bills.

Typical comparison mistakes include:

• choosing on refrigerant alone
• over-valuing maximum temperature claims
• comparing brands before checking system design
• ignoring the installer’s real experience with the platform

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

In London, Surrey, and TW homes, the better choice between Grant Aerona3 and Samsung EHS usually depends more on the house and installer than on headline branding. According to Ofgem (April 2026), electricity remains 24.5p/kWh on the typical direct-debit cap, so control quality and emitter suitability still have a direct effect on running costs.

For period terraces, 1930s semis, and mixed-age detached homes in the South East, the useful question is whether the installer can justify the full design path. Some homes will justify Samsung’s R290 positioning. Others will fit perfectly well within a Grant design without paying for a stronger retrofit narrative than the house actually needs.

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

In practice, many South East retrofit decisions are won or lost on clarity. If one quote explains radiator upgrades, cylinder strategy, and controls in plain terms while another leans on branding alone, the clearer route usually ages better after installation. That is especially relevant in mixed-age housing stock where comfort expectations vary room by room.

How Electromatic Can Help

If you are comparing Grant Aerona3 vs Samsung EHS, the next step is a survey that checks heat loss, emitters, hot water, and controls before the brand is chosen. According to MCS (2025), compliant heat pump performance depends on documented design and commissioning, not just on the brochure you prefer.

Electromatic can show where each route makes practical sense in London and Surrey housing stock and whether the wider project should include solar or battery storage planning at the same time. 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 technology winner. It also makes quote comparison easier because the scope is clearer from the start.

Book your free home survey →

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

Frequently Asked Questions

Most follow-up questions on Grant Aerona3 vs Samsung EHS are really about whether Samsung’s R290 and higher-temperature message make it the automatic retrofit winner. According to current manufacturer positioning and MCS design principles, the answer remains property-specific because design and commissioning still decide results.

How much does refrigerant choice matter in this comparison?

It matters if low GWP and future-facing refrigerant strategy are priorities for you. It still does not replace the need for proper heat-loss calculations and emitter checks.

Can Grant Aerona3 still work well in older homes?

Yes. In many homes it can be a sensible fit if the system is designed correctly and the installer is not trying to oversimplify the retrofit.

Do I need Samsung because it reaches higher temperatures?

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

Is Samsung EHS always better for radiator-based systems?

No. It may suit some radiator-led retrofits well, but radiator performance still depends on system design rather than on one headline product claim.

Which option makes more sense in Surrey and TW homes?

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