Daikin vs Mitsubishi Electric air conditioning

Daikin and Mitsubishi Electric are two of the four brands that dominate UK heat pump sales. Official statistics put at least 33 manufacturers supplying air source heat pumps in the UK, with Mitsubishi Electric, Vaillant, Daikin and Samsung accounting for nearly two-thirds of total annual UK sales¹. That concentration matters to a householder: it means both brands have deep installer networks, published technical support and long warranty structures, and it also means neither is a niche choice with unusual parts or unfamiliar service arrangements.

The two companies differ in where the equipment comes from. Mitsubishi Electric manufactures heat pumps in the UK and describes itself as a UK manufacturer producing the crucial components, including the heat exchanger, compressor and controls². Its Livingston factory has operated for over 30 years, employs more than 1,100 people and produces the Ecodan range of air-to-water heat pumps³. Daikin's UK presence is built around training and installer support rather than a stated UK heat pump factory, and it has added four new training centres in the UK⁴.

On guarantees, the headline difference is the standard term. Daikin states that all its domestic products come with a two-year guarantee as standard⁵, while Mitsubishi Electric's Homeowner Guarantee covers domestic heating products if components it supplied fail⁶, with extended warranties of up to 10 years available through its Business Solutions and Diamond Quality Partners⁷. Both brands lean on approved installers to deliver the longer terms.

Two of the biggest names in UK heat pumps: how they compare

The starting point for any comparison is scale, and here the official figures are more useful than either company's own marketing. The UK had at least 33 manufacturers supplying air source heat pumps, with Mitsubishi Electric, Vaillant, Daikin and Samsung accounting for nearly two-thirds of total annual UK sales¹. On the manufacturing side, the main companies making air source heat pumps in the UK in 2024 were Mitsubishi Electric, Vaillant, Ideal and Octopus Energy, with a combined market share of 34%¹.

Mitsubishi Electric reports a strong position in installer surveys. It says it was ranked first as the UK's most trusted air source heat pump manufacturer, first as a brand installers would recommend, first for manufacturing the highest quality air source heat pumps, first for providing industry-leading training and first as the easiest air source heat pump to install⁸. The same survey work found it was the most widely installed air source heat pump brand among installers surveyed and the manufacturer most frequently selected as the brand they install most often⁹. These are the company's own reports of survey results, with fieldwork running from May 2025 to February 2026⁸.

Daikin's position is different in emphasis. It is one of the four largest sellers by volume, and it estimates that heat pumps already have up to 50% market share in new single family houses in Europe¹⁰. It also works through partnerships with large energy firms: Octopus has a list of recognised technology partners, and Daikin was already one of them¹¹.

For a household, the practical reading is that both brands are mainstream, both have the volume to support spare parts and trained engineers, and neither is likely to leave an owner without service options. The difference is that Mitsubishi Electric can point to UK manufacturing and a long-running installer survey record, while Daikin's case rests on range breadth, refrigerant policy and its training and partner network.

Company background and UK presence

Mitsubishi Electric was founded in 1921 and describes itself as a global environmental technologies manufacturer⁷. Its UK manufacturing story is the more concrete of the two: the company says it has been investing in UK manufacturing and skills for more than five decades³, and its Livingston site in Scotland has been operating for over 30 years as the largest manufacturer of air source heat pumps in the UK³. The site produces the Ecodan range of air-to-water heat pumps and employs more than 1,100 people³. Independent product listings describe the Ecodan range as made in Britain, to British Standard, for British homes¹².

The company also states that its air source heat pumps have been designed and developed for UK conditions for over a decade¹³, and that it can advise housing developers on meeting requirements under the Future Homes Standard¹³. In February 2023 it launched what it described as the widest range of commercial and residential heat pumps, spanning from a small modern home up to a 1000+kW heat pump chiller¹⁴.

Daikin's UK presence is expressed through its product range and its training infrastructure. It specialises in air-to-air, air-to-water and hybrid heat pumps¹⁵, and it has expanded its UK training network with four new centres⁴. Its stated refrigerant strategy is to choose the ideal refrigerant for each application by balancing safety, energy efficiency, environmental impact and cost over the whole life cycle of a product, always in line with current regulations¹⁶.

Range: air-to-air, air-to-water and hybrid options

Daikin's range is the broader of the two on paper. It specialises in air-to-air, air-to-water and hybrid heat pumps¹⁵, and says these can be integrated with existing radiators or underfloor heating¹⁵. Its hybrid heat pumps are designed to let a household either replace a gas boiler while keeping existing radiators, or connect air-to-air indoor units for cooling as well¹⁷. A multi air-to-air heat pump, also known as an air conditioner, can connect one outdoor unit with up to five indoor units¹⁷. Daikin describes these hybrid models as compact and space-saving, able to combine with existing and new heating and cooling emitters¹⁷.

Mitsubishi Electric's residential heating range is built around the Ecodan air-to-water heat pump, manufactured at Livingston³. On the air conditioning side, its multi-split systems allow connections of between two and eleven indoor units to a single outdoor unit¹⁸. It also makes domestic ventilation units⁷ and ventilation systems that provide fresh, clean air to improve indoor air quality in homes and commercial buildings¹⁹.

The distinction that matters most for a household is between air-to-water and air-to-air. An air-to-water heat pump feeds radiators, underfloor heating or a hot water cylinder, and is the route that replaces a boiler. An air-to-air unit heats and cools the air in a room directly and does not produce hot water. Daikin states plainly that its heat pumps provide one system for heating and hot water¹⁹, and that its products comply with the ErP because they are designed for seasonal efficiency²⁰. Mitsubishi Electric's Ecodan range is air-to-water, so a household wanting cooling as well as heating would be looking at its air conditioning products rather than the heating range.

Installer network, training and technical support

Both brands route almost everything through approved installers, and the quality of that network is the part a household actually experiences.

Mitsubishi Electric says it has a vast network of reliable national heating installers, who receive comprehensive training on installing and maintaining Ecodan heat pumps⁶, and thousands of nationwide Accredited Ecodan Installers, searchable by postcode²¹. Its partner structure has three tiers: Diamond Quality Partners, Business Solutions Partners and Accredited Installers⁷. Diamond Quality Partners undergo external auditing to ensure they maintain high installation standards¹⁸. The company reports being ranked first for providing industry-leading training⁸.

Daikin's route is through Daikin-trained installers, who guide a household from assessing the home through to installing and commissioning¹⁹. The company has expanded its UK training provision with four new centres⁴.

On technical support, Mitsubishi Electric publishes several contact routes. Its Homeowner Support Team is on 0161 866 6064⁶, the main support line is 0161 866 6089, option 1²¹, and Residential Heating Sales can be reached on 01707278666²². Service and maintenance enquiries go to ecodan.service@meuk.mee.com²³. A pre-sales technical team assists with design, feasibility and purchase costs¹³, and the company publishes a Heating Product Catalogue and a Heating Domestic Applications Brochure¹³.

Daikin offers service plans delivered with its Service Partners to oversee, manage and monitor an installation²⁴, and annual maintenance packages for its Altherma and Hybrid systems²⁴. It also takes requests for site visits to residential or commercial properties²⁴. Mitsubishi Electric runs a comparable site visit process to check installation compliance, requested through a form and followed up by its site services team¹³, and offers support across the full life cycle of a development project, from design through commissioning to ongoing support²³.

Warranty, commissioning and maintenance plans

This is where the two brands diverge most sharply on paper, and where the detail matters more than the headline.

Daikin states that all its domestic products come with a two-year guarantee as standard⁵. It also says that having Daikin engineers personally commission each unit on site extends the warranty, and describes this as giving the client extra confidence¹¹. That statement appears in a project case study rather than a published warranty schedule, so the additional term is not stated in the material available; a household would need the extension confirmed in writing.

Mitsubishi Electric's Homeowner Guarantee covers domestic heating products in the event of any components supplied by Mitsubishi Electric failing²². For Lossnay MVHR units, guarantee servicing is free of charge for parts and labour, subject to all guarantee conditions being met²⁵. Eligibility is tightly drawn: the guarantee applies only to residential Lossnay MVHR units supplied by Mitsubishi Electric Europe and purchased from Mitsubishi Electric Europe or an approved wholesaler, value added reseller or merchant, installed and commissioned by an ARLI or SAH²⁵. Where there is no fault found, or a claim is rejected under the conditions, Mitsubishi Electric is entitled to charge all reasonable costs incurred in attending the home²⁵.

Extended warranties come through the partner tiers. Mitsubishi Electric says its partners can offer extended warranties and that using an approved installer gives reassurance¹⁸, and that with its Business Solutions and Diamond Quality Partners, extended warranties can be offered of up to 10 years⁷.

On maintenance, Mitsubishi Electric offers three service and maintenance plans²¹, and Daikin offers annual maintenance packages for Altherma and Hybrid systems alongside its wider service plans²⁴. Both brands also publish material on keeping a home free of damp and mould: a practical guide on mould and damp prevention in new and existing homes is available to download for free from BESA and Mitsubishi Electric²⁶.

UK market standing: what installer surveys and MCS data show

The wider market context is worth setting out, because it explains why both brands behave as they do.

MCS certified renewable installations reached 210,000 in the UK between January and June 2026, with 36,000 MCS certified battery storage installations in 2026 so far²⁷. That volume of certified work is what sustains the installer networks both brands depend on. On the installer side, a Mitsubishi Electric survey found 23% of installers were not interested in learning to upskill, and 15% of respondents believed the absence of a skilled heat pump installer had stopped them buying a unit⁹. Those figures describe installer and consumer sentiment rather than either brand's performance, but they explain why manufacturer training programmes carry weight.

Mitsubishi Electric's own survey reporting is the most detailed brand-level evidence available. It says it was ranked first as the UK's most trusted air source heat pump manufacturer, first as a brand that can be relied on to do the job well, first as a manufacturer installers would recommend, first as the market leader in air source heat pumps in the UK, first for manufacturing the highest quality air source heat pumps, first for providing industry-leading training and first as the easiest to install⁸. It also emerged as the manufacturer most likely to be considered for future installations⁸. These are the company's reports of installer survey results, with fieldwork from May 2025 to February 2026⁸.

Daikin's market evidence in the material available is thinner on installer sentiment and stronger on new build. It estimates heat pumps already have up to 50% market share in new single family houses in Europe¹⁰, and it works as a recognised technology partner to Octopus¹¹. Its installer incentive scheme covered England, Scotland or Wales⁴, which is a reminder that some commercial schemes do not extend across all four nations.

Which brand suits which home

Neither brand is a universal answer, and the deciding factors are usually the building and the installer rather than the badge.

A household replacing a boiler and wanting hot water from the same system is looking at air-to-water: Mitsubishi Electric's Ecodan range, made at Livingston³, or Daikin's air-to-water and hybrid options¹⁵. A household wanting cooling in summer as well as heating in winter is looking at air-to-air, where Daikin's hybrid models can connect air-to-air indoor units for cooling¹⁷ and its multi air-to-air heat pump can serve up to five indoor units from one outdoor unit¹⁷. Mitsubishi Electric's multi-split air conditioning connects between two and eleven indoor units to a single outdoor unit¹⁸, which suits a larger property wanting several rooms conditioned.

Where a home already has radiators that are staying, Daikin states its heat pumps can be integrated with existing radiators or underfloor heating¹⁵, and its hybrid models are designed to combine with existing and new heating and cooling emitters¹⁷. Where a household wants a single manufacturer for heating, hot water and ventilation, Mitsubishi Electric covers all three through Ecodan, its air conditioning ranges and its domestic ventilation units⁷.

On indoor air quality, the two brands answer differently. Daikin sells air purifiers offering whisper-quiet filtration for spaces up to 41m2²⁸. Mitsubishi Electric's answer is ventilation: systems that provide fresh, clean air to improve indoor air quality in homes and commercial buildings¹⁹. Filtration and ventilation do different jobs, and a household concerned about stuffiness in a well-sealed home is usually looking at ventilation rather than a purifier.

The remaining variables are support and warranty. Mitsubishi Electric publishes a Homeowner Support line on 0161 866 6064⁶ and extended warranties of up to 10 years through its partner tiers⁷. Daikin's standard domestic guarantee is two years, with an extension tied to its own engineers commissioning the unit⁵. Both brands offer maintenance plans²¹. For a household, the practical step is to ask each installer which partner tier they hold, what the warranty term will be in writing, and who attends if something fails.