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ADVICE CENTRE \xc2\xb7 DAIKIN X SERIES
Daikin X Series Heat Pump: UK Availability, Specifications and MCS Status
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One outdoor unit providing air-to-air heating, air conditioning, wet central heating and domestic hot water. But how suitable is the Daikin X Series for UK homes?
The Daikin X Series is a new type of air source heat pump that combines air-to-air and air-to-water heating technology within a single outdoor system.
Announced in June 2026, the X Series can supply conventional radiators, underfloor heating, domestic hot water and indoor air-conditioning units without requiring separate outdoor heat pumps.
For homeowners planning a new build, substantial renovation or replacement heating system, this could provide an interesting alternative to installing a conventional air-to-water heat pump alongside a separate air-conditioning system.
However, combining several technologies introduces additional design considerations. The available heating capacity, operating temperatures and ability to supply different heating demands simultaneously all need to be understood.
There are also important questions surrounding UK availability, MCS certification and eligibility for the Boiler Upgrade Scheme.
At Heat Loss Hub, we examine the Daikin X Series from an independent heating design perspective, looking beyond the headline features to understand what the system can deliver and where its limitations may lie.
Daikin X Series UK Status \xe2\x80\x93 October 2026
Daikin has officially announced the X Series, published technical specifications and begun a phased European launch. However, several important UK-specific details remain unconfirmed.
| Question | Current position |
|---|---|
| Has the Daikin X Series been officially announced? | Yes – June 2026 |
| Has the European launch started? | Phased launch from September 2026 |
| Does Daikin UK list compatible products? | Yes |
| Is UK stock availability confirmed? | Not independently verified |
| Is the X Series MCS certified? | Not independently verified |
| Is it eligible for the Boiler Upgrade Scheme? | Not established |
| What refrigerant does it use? | R32 |
| Does it provide wet central heating? | Yes |
| Does it provide air-to-air heating and cooling? | Yes |
| Does it provide domestic hot water? | Yes |
| Are UK installed prices available? | Not independently verified |
Important
Daikin's publication of UK product information does not automatically establish UK stock availability, MCS certification or grant eligibility. We will update this page as further verified information becomes available.
Source: Daikin Europe’s official X Series announcement.
What Is the Daikin X Series?
The Daikin X Series combines two established heat pump technologies.
Air-to-water heating transfers heat into water circulating through radiators, underfloor heating and the domestic hot water system.
Air-to-air heating and cooling transfers heat directly between the refrigerant system and indoor air-handling units, allowing rooms to be heated or cooled without using conventional radiators.
Traditionally, a homeowner wanting both technologies would generally install two separate outdoor systems.
The X Series combines their functions within one outdoor unit.
Daikin describes a system with five connections, supporting:
- Up to four air-to-air indoor units.
- One Daikin Altherma hydraulic indoor unit.
- Radiators or underfloor heating.
- An integrated domestic hot water cylinder.
The air-to-air indoor units can include wall-mounted, floor-standing, concealed ceiling and cassette arrangements, depending on the approved equipment configuration.
This gives designers flexibility over how heating and cooling are distributed throughout a property.
For example, a home might use underfloor heating across the ground floor, radiators in certain bedrooms and air-to-air units in rooms where summer cooling is particularly desirable.
However, every part of the system must be considered within the capacity and operating limitations of the shared outdoor unit.
Is the Daikin X Series a hybrid heat pump?
Daikin describes the X Series as a mixed-technology heat pump.
Although the system combines different heating methods, it should not be confused with a conventional hybrid heating arrangement combining a fossil-fuel boiler with a heat pump.
The X Series uses electrically driven heat pump technology for both its air-to-air and air-to-water functions.
This distinction is important when discussing system design and potential government grant eligibility.
Daikin X Series Technical Specifications
Daikin has published technical information for two X Series outdoor unit models.
These are the 5XXM68A2V1B and 5XXM90A2V1B.
Both use R32 refrigerant and can connect to compatible CHVX-A hydraulic indoor units.
Outdoor unit specifications
| Specification | 5XXM68A2V1B | 5XXM90A2V1B |
|---|---|---|
| Refrigerant | R32 | R32 |
| Factory refrigerant charge | 2.0 kg | 2.4 kg |
| Refrigerant GWP | 675 | 675 |
| Height | 734 mm | 734 mm |
| Width | 1,040 mm | 1,040 mm |
| Depth | 408 mm | 408 mm |
| Weight | 69 kg | 73 kg |
| Maximum total refrigerant pipe length | 60 m | 75 m |
| Electrical supply | Single-phase | Single-phase |
| Nominal supply voltage | 220–240 V | 220–240 V |
The maximum total pipe length is not the maximum permitted distance to every individual indoor unit. Separate pipe-length and height-difference restrictions also apply.
Source: Daikin 5XXM-A official outdoor unit specifications.
Air-to-water heating performance
Daikin also publishes the following nominal heating performance figures for the X Series when connected to its CHVX-A hydraulic indoor unit.
| Performance | 5XXM68A2V1B | 5XXM90A2V1B |
|---|---|---|
| Heating output at A7/W35 | 6.0 kW | 7.5 kW |
| COP at A7/W35 | 4.50 | 4.20 |
| Heating output at A7/W55 | 5.9 kW | 7.8 kW |
| COP at A7/W55 | 2.60 | 2.70 |
| Maximum published central-heating flow temperature | 55°C | 55°C |
| SCOP at 35°C | 4.25 | 4.10 |
| SCOP at 55°C | 3.00 | 3.00 |
Understanding the test conditions
A7/W35 means an outdoor air temperature of 7°C and a heating-water flow temperature of 35°C.
A7/W55 represents the same outdoor temperature with the water heated to 55°C.
These are standardised performance conditions. They should not be confused with the available heating output at the property’s winter design temperature.
The figures also relate to the hydraulic heating function. They must not simply be added to separately published air-to-air capacities to calculate the system’s total simultaneous output.
Source: Daikin CHVX-A / 5XXM-A performance specifications.
How Much Heating Can the Daikin X Series Actually Deliver?
This is one of the most important questions when assessing the X Series.
A conventional air-to-water heat pump is generally selected according to the property’s calculated design heat loss, its output at the relevant outdoor temperature and the water temperature required by the heating system.
The X Series introduces another consideration because its outdoor unit serves both hydraulic and air-to-air heating demands.
Hydraulic heating capacity is not the same as total system capacity
The published nominal hydraulic outputs are 6.0 kW and 7.5 kW at A7/W35, depending on the outdoor unit.
However, these figures do not establish how much heat will be available through the radiators or underfloor heating during the coldest expected winter conditions.
They also do not establish how capacity will be shared when air-to-air heating units are operating simultaneously.
For example, a property might require:
- 4 kW of heating through radiators and underfloor heating.
- 3 kW of heating through air-to-air indoor units.
- Additional capacity at certain times for domestic hot water production.
The design must establish whether the selected system can meet those demands under the intended operating conditions.
It would be incorrect to assume that the published hydraulic and air-to-air capacities can simply be added together.
The available capacity must be checked against Daikin’s approved selection and simultaneous-operation data.
What about heating output at -3\xc2\xb0C?
For a UK heating system design, we would want performance information at the property’s relevant winter design temperature.
This might be approximately -3°C in some areas, with lower design temperatures applicable elsewhere.
We would also want to know how output changes at different water temperatures.
At present, we have not established a complete manufacturer performance matrix covering the X Series’ hydraulic output across those conditions, including simultaneous operation with air-to-air heating.
Until that information is confirmed, the published A7 figures should not be used as the sole basis for selecting a system.
For further information, see our Heat Loss and Heat Pump Sizing Guide.
Can the Daikin X Series Heat and Cool Simultaneously?
One of the attractions of combined heat pump systems is the possibility of providing different forms of heating and cooling from one outdoor unit.
However, not every combined system operates in the same way.
Daikin confirms that the X Series can operate its air-to-air and air-to-water sections simultaneously when they are operating in the same mode.
This is an important qualification.
Air-to-air heating alongside radiators or UFH
Daikin confirms simultaneous same-mode operation.
This potentially allows air-to-air indoor units to provide warm air while the hydraulic system supplies radiators or underfloor heating.
However, the available combined heating capacity still needs to be established.
Air conditioning alongside wet central heating
Homeowners should not assume that the X Series can provide air-to-air cooling in one part of the house while simultaneously supplying hot water to radiators in another.
Daikin’s published same-mode statement does not establish this capability.
We would want explicit confirmation of the permitted operating combinations before specifying the system for this application.
Cooling through the hydraulic system
Daikin’s hydraulic-unit technical data includes a cooling-water operating range.
However, this should not be interpreted as confirmation that conventional radiator or underfloor heating installations can automatically provide suitable cooling.
Cooling through a wet heating system requires careful consideration of water temperatures, condensation, controls and appropriate emitters.
Conventional radiators are generally poorly suited to meaningful space cooling, while underfloor cooling has limitations.
Domestic hot water during air conditioning
The ability to produce domestic hot water while air conditioning is operating is another important consideration.
Daikin’s general product information confirms both functions, but we have not independently established the detailed operating priority, capacity-sharing arrangements or whether the X Series provides heat recovery from air-conditioning operation.
This should be confirmed before treating simultaneous cooling and hot water production as a particular efficiency benefit.
The important distinction is between a system offering several functions and a system being able to deliver all those functions simultaneously under every operating condition.
Flow Temperatures, Radiators and Underfloor Heating
The X Series has a published maximum central-heating water temperature of 55°C.
This makes emitter design particularly important.
Can the Daikin X Series work with existing radiators?
Potentially, yes.
However, the existing radiators must be capable of providing sufficient heat at the intended operating temperature.
Radiators originally installed for a gas or oil boiler may have been selected around considerably higher water temperatures.
When the flow temperature is reduced, the heat output from those radiators also reduces.
For example, a radiator delivering adequate output at a conventional boiler operating temperature may not meet the room’s design heat loss when supplied with 45°C water.
The correct approach is to calculate the room-by-room heat losses and compare those requirements with the available radiator outputs at the proposed flow and return temperatures.
Where necessary, radiators may need replacing or supplementing.
Is the X Series suitable for underfloor heating?
Underfloor heating could be particularly suitable where the property has relatively low heat losses and the floor construction can deliver sufficient output at lower water temperatures.
However, underfloor heating is not automatically suitable simply because it is described as a low-temperature emitter.
The system still needs to be designed around:
- Room heat losses.
- Available heated floor area.
- Pipe spacing and circuit arrangements.
- Floor insulation and construction.
- Floor coverings.
- Design flow and return temperatures.
A properly designed underfloor heating system may allow the X Series to operate at significantly lower temperatures than a radiator system requiring 55°C.
That can have a meaningful influence on electricity consumption.
Read our Underfloor Heating with Heat Pumps guide. If you are specifying the underfloor heating itself, our independent underfloor heating design service can produce the room-by-room calculations and CAD pipework layout.
What if the property has radiators and UFH?
Properties combining radiators and underfloor heating require a coordinated design.
If both emitter types can meet their room heating requirements at a common operating temperature, a shared-temperature arrangement may be possible.
Where different operating temperatures are required, appropriate hydraulic and control arrangements will be necessary.
The X Series’ ability to control the proposed heating circuits and temperatures must be checked against the selected hydraulic configuration.
Domestic Hot Water Production
The X Series uses a compatible Daikin CHVX-A hydraulic indoor unit incorporating a stainless-steel domestic hot water cylinder.
Two cylinder capacities are available:
180 litres and 230 litres.
Daikin also publishes indoor-unit variants with integrated 4 kW or 9 kW electric backup heaters.
Is the cylinder large enough?
That depends on the property and household.
Cylinder sizing should consider the number of occupants, bathrooms, simultaneous hot water demand, available storage temperature and heat-pump recovery performance.
A 180-litre cylinder may be appropriate for one household but insufficient for another.
Similarly, selecting a 230-litre cylinder does not automatically guarantee adequate hot water performance.
The cylinder’s usable stored energy and recovery rate are just as important as its nominal capacity.
Electric backup heating
The available backup-heater configurations also require consideration.
The 9 kW heater variant has different electrical supply requirements from the 4 kW version, including a published three-phase supply requirement.
That could have practical implications for some UK domestic properties.
A larger backup heater should not be treated as a substitute for selecting a heat pump with sufficient design heating capacity.
It is also important to distinguish between heat delivered efficiently by the refrigeration system and heat supplied directly by an electric resistance heater.
The latter generally consumes approximately one unit of electricity for each unit of heat delivered.
Detailed cylinder recovery times, heat-pump-only hot water temperature limits and simultaneous-operation arrangements should be confirmed for the exact proposed configuration.
Source: Daikin CHVX-A indoor unit specifications.
How Efficient Is the Daikin X Series?
Daikin publishes encouraging seasonal efficiency figures for the X Series, particularly when supplying lower-temperature water.
For the hydraulic heating system, the published SCOP figures are approximately:
| Heating-water temperature | Published SCOP |
|---|---|
| 35°C | 4.10–4.25 |
| 55°C | 3.00 |
These figures demonstrate the importance of operating temperature.
A system designed around 35°C water can achieve a substantially different seasonal performance from one requiring 55°C.
However, these are standardised manufacturer figures rather than guaranteed results for an individual UK property.
Actual performance will depend on the building, heating distribution, weather, controls, domestic hot water requirements and how the system operates throughout the year.
One system does not automatically mean lower running costs
The X Series may reduce the need for separate outdoor equipment, but that does not necessarily mean it will consume less electricity than two correctly designed standalone systems.
The comparison would need to consider:
- The heating demand supplied through the hydraulic circuit.
- The heating and cooling demand supplied through the air-to-air units.
- Operating temperatures.
- Simultaneous capacity limitations.
- Domestic hot water production.
- Control strategies and part-load performance.
The most efficient arrangement will depend on how the property is actually used.
For homeowners considering a combined heating and cooling installation, an independent assessment can help establish whether an integrated system offers a genuine advantage over separate equipment.
Daikin X Series Installation Requirements
The X Series differs from a conventional R290 monobloc heat pump in several important ways.
R32 Refrigerant and Refrigerant Pipework
The Daikin X Series uses R32 refrigerant, with a published global warming potential of 675.
Unlike a typical monobloc heat pump, the refrigerant circuit extends beyond the outdoor unit through pipework connecting compatible indoor equipment.
This requires appropriately qualified refrigerant installation personnel and compliance with the manufacturer’s installation and safety requirements.
The refrigerant pipework layout must consider permissible lengths, height differences, additional refrigerant charge and service access.
R32 is classified as an A2L refrigerant, meaning it has lower flammability than some alternatives but still requires suitable precautions.
Learn more in our R290 vs R32 Heat Pumps guide.
Outdoor Unit Positioning and Noise
The outdoor unit must be positioned with consideration for airflow, access, neighbouring properties and acoustic performance.
Although Daikin publishes outdoor-unit noise information, sound pressure figures should not be confused with the sound power data required for a formal acoustic assessment.
Where applicable, an MCS noise assessment and the relevant planning requirements should be considered before installation.
Electrical Requirements
The outdoor unit uses a single-phase supply, but the complete installation’s electrical requirements depend on the selected indoor hydraulic unit and backup-heater configuration.
The electrical design must consider the complete installation rather than the outdoor unit alone.
This may include an assessment of the existing electricity supply and any necessary Distribution Network Operator notification or application.
Indoor Equipment and Controls
The hydraulic unit requires indoor space, and air-to-air equipment must be positioned to distribute heating and cooling effectively.
Daikin also supports control through its Onecta application, including temperature settings, scheduling and monitoring of supported functions.
However, app connectivity should not be confused with the heating system’s underlying control capabilities.
The installer must establish how room demands, heating circuits, operating modes and hot water production are coordinated.
Is the Daikin X Series Available in the UK?
Daikin Europe officially announced the X Series on 22 June 2026.
The manufacturer stated that a phased European launch would begin in September 2026, with availability varying between countries.
As of October 2026, Daikin’s UK website includes compatible 5XXM-A product combinations.
This is encouraging because the equipment is appearing within the manufacturer’s UK product information.
However, we have not independently confirmed:
- General UK distributor stock.
- A definitive UK on-sale date.
- Which installer partners are offering the system.
- UK equipment or installed pricing.
- The complete UK installation and support arrangements.
A product appearing on a manufacturer’s website does not necessarily mean it is available for immediate installation.
How much does the Daikin X Series cost?
We have not established a reliable UK installed price.
The final cost will depend on the outdoor unit, selected air-to-air indoor units, hydraulic unit, cylinder configuration, refrigerant pipework, electrical installation and heating distribution.
For renovation projects, radiator replacements, underfloor heating alterations and other building work could significantly influence the total installation cost.
Comparing the X Series with a conventional heat pump and separate air conditioning would therefore require a complete installed-system comparison.
Is the Daikin X Series MCS Certified?
As of 9 October 2026, Heat Loss Hub has not independently verified an MCS Product Directory listing for the Daikin X Series.
This does not necessarily mean the product has not received certification.
It means we have not established the necessary certification references for the exact X Series equipment combinations.
There is an important distinction between different Daikin product ranges.
In September 2026, Daikin and Eurovent Certification announced that 65 Daikin Multi-split and Multi+ combinations had been listed on the MCS Product Directory.
However, those products should not automatically be confused with the new X Series.
Certification of one Daikin product family does not establish certification of another.
Before relying on MCS certification, the exact outdoor unit, hydraulic unit and approved equipment combination should be checked against the current MCS Product Directory.
Product certification and installer certification are also separate requirements.
Source: Eurovent – Daikin Multi-split and Multi+ MCS announcement, September 2026.
Does the Daikin X Series Qualify for the Boiler Upgrade Scheme?
Boiler Upgrade Scheme eligibility for the Daikin X Series has not yet been established.
The scheme currently supports several heat pump technologies, including eligible air-to-water and air-to-air installations.
As of October 2026, the published grants include:
| Technology | Standard grant |
|---|---|
| Air-to-water heat pump | £7,500 |
| Air-to-air heat pump | £2,500 |
| Ground source heat pump | £7,500 |
A temporary £9,000 grant is also available for certain eligible off-gas-grid air-to-water and ground source installations until 31 March 2027.
However, the X Series combines air-to-air and air-to-water technology within one system.
This creates an important certification and classification question.
It would be incorrect to assume that an X Series installation automatically qualifies for the £7,500 air-to-water grant because it supplies radiators and domestic hot water.
Similarly, it should not automatically be treated as eligible for the £2,500 air-to-air grant simply because it includes indoor air-conditioning units.
The scheme excludes certain hybrid systems combining fossil-fuel heating with heat pumps, but that exclusion does not by itself establish the position of an electrically driven mixed air-to-air/air-to-water system.
Eligibility must be confirmed against the applicable product certification, installation design and current scheme requirements.
The Ofgem Boiler Upgrade Scheme Product Eligibility List is a useful reference, although Ofgem advises that product inclusion alone does not establish full installation eligibility.
Homeowners should obtain written confirmation of grant eligibility before allowing any assumed BUS contribution to influence their installation decision.
Source: Ofgem – Boiler Upgrade Scheme Guidance.
Daikin X Series \xe2\x80\x93 Advantages and Limitations
From an independent heating design perspective, the X Series introduces several interesting possibilities. However, it also has limitations that need to be understood.
Potential Advantages
- One outdoor unit – the system combines functions that would otherwise often require separate outdoor heating and air-conditioning equipment.
- Heating and cooling flexibility – compatible air-to-air indoor units can provide room heating and active cooling, while the hydraulic system serves suitable radiators and underfloor heating.
- Integrated hot water production – the CHVX-A indoor unit includes domestic hot water storage, reducing the need to specify a completely separate hot water arrangement.
- Different indoor unit options – wall-mounted, floor-standing and concealed air-to-air equipment may offer flexibility for different room layouts.
- Potential for low-temperature heating – in appropriately designed homes, the hydraulic system may be able to operate at lower temperatures, improving seasonal efficiency.
Potential Limitations
- Shared outdoor capacity – available heating output must be assessed when different parts of the system operate simultaneously.
- Maximum 55°C central-heating flow temperature – this may limit suitability for existing radiator systems requiring higher temperatures.
- Operating-mode restrictions – Daikin confirms same-mode simultaneous operation, but homeowners should not assume unrestricted heating and cooling combinations.
- Refrigerant installation requirements – the X Series requires refrigerant pipework and appropriately qualified installation personnel.
- Equipment configuration – the available indoor unit combinations, cylinder options and electrical requirements need careful selection.
- Unconfirmed UK certification and grant eligibility – these issues could influence whether the system is a practical choice for a UK homeowner planning an installation.
A further consideration: one system or two?
Combining several functions within one outdoor unit can reduce equipment duplication.
However, separate systems also have potential advantages.
A conventional air-to-water heat pump and separate air-conditioning system can operate independently, with different manufacturers, capacities and control arrangements selected for each application.
A fault affecting a shared outdoor unit could also interrupt several heating or cooling functions.
The correct choice depends on the property’s requirements, installation constraints and the homeowner’s priorities.
Which Properties Could Suit the Daikin X Series?
Daikin describes the X Series as being intended primarily for new-build and substantially renovated homes of up to approximately 150 m².
However, this is a general application guide rather than a substitute for a proper heating design.
Two properties with identical floor areas can have very different heating requirements.
Modern New Builds
A modern, well-insulated home with relatively low heat losses could be a strong candidate.
Underfloor heating could provide the main background heating, while selected air-to-air units could provide additional heating and summer cooling.
The design would need to establish whether the combined system could meet all required loads.
Substantial Renovations
The X Series could be worth considering where a homeowner is replacing an existing heating system and installing air conditioning as part of the renovation.
With floors, ceilings and walls accessible, there may be greater flexibility to install refrigerant pipework and suitable heating distribution.
Existing Properties with Radiators
The X Series may also be suitable for some existing homes.
However, radiator performance at lower operating temperatures must be assessed.
Older properties with relatively high heat losses or insufficient radiator capacity may require substantial emitter upgrades.
Where the required heating load exceeds the available hydraulic capacity, additional design considerations arise.
When Might a Conventional Heat Pump Be Better?
If a property doesn’t require air conditioning, a conventional air-to-water heat pump may be simpler.
Similarly, a homeowner who needs independent heating and cooling operation might prefer separate systems.
The best solution should be established through the calculated heating requirements and the homeowner’s intended use of the property, rather than the number of functions advertised by a manufacturer.
Daikin X Series vs Samsung EHS Quint
The Daikin X Series is not the only emerging heat pump designed to combine air-to-air and air-to-water technology.
Samsung’s EHS Quint follows a similar broad concept, providing wet central heating, domestic hot water and air conditioning through a combined outdoor system.
However, the products have important technical differences.
| Feature | Daikin X Series | Samsung EHS Quint |
|---|---|---|
| Combined air-to-air and air-to-water | Yes | Yes |
| Refrigerant | R32 | R32 |
| Radiator and UFH heating | Yes | Yes |
| Domestic hot water | Yes | Yes |
| Air-to-air cooling | Yes | Yes |
| Published CH flow-temperature limit | 55°C | Up to 65°C |
| Simultaneous operating modes | Same-mode operation confirmed | Samsung describes more flexible simultaneous operation |
| Cooling heat recovery for hot water | Not independently confirmed | Advertised by Samsung |
| UK MCS status | Not verified | Requires model-specific verification |
| BUS eligibility | Not established | Not established |
The distinction between the products’ published central-heating temperature limits is particularly relevant to radiator retrofits.
Samsung also describes heat recovery from air-conditioning operation for domestic hot water production. Equivalent functionality has not yet been verified for the Daikin X Series.
However, neither product should be selected solely on headline specifications. The available output at the property’s design conditions, approved operating combinations and complete system design remain critical.
Read our Samsung EHS Quint – Independent UK Guide for further information.
Frequently Asked Questions
Is the Daikin X Series available in the UK?
Daikin has begun a phased European launch, and compatible X Series equipment appears on Daikin’s UK website. However, we have not independently confirmed general UK stock availability, a definitive on-sale date or an established UK installation route.
What refrigerant does the Daikin X Series use?
The X Series uses R32 refrigerant. The two published outdoor models have factory refrigerant charges of 2.0 kg and 2.4 kg respectively.
Can the Daikin X Series run radiators?
Yes, provided the heating system is designed appropriately. Daikin publishes a maximum central-heating flow temperature of 55°C, so existing radiators must be assessed to establish whether they can provide sufficient heat at the proposed operating temperature.
Does the Daikin X Series provide air conditioning?
Yes. Compatible air-to-air indoor units provide active heating and cooling. However, the permitted simultaneous heating and cooling combinations must be considered when designing the complete system.
How many indoor air-conditioning units can it connect?
Daikin describes support for up to four compatible air-to-air indoor units alongside one hydraulic indoor unit. The exact combination must be checked against the manufacturer’s approved configuration data.
Can it heat radiators and run air conditioning at the same time?
Daikin confirms simultaneous air-to-air and air-to-water operation in the same mode. We have not independently established that it supports air-to-air cooling while simultaneously supplying heated water to radiators. This should be confirmed before specifying that operating arrangement.
Is the Daikin X Series MCS certified?
Heat Loss Hub has not independently verified an MCS Product Directory listing for the X Series as of October 2026. Certification should be checked using the exact model references and approved equipment combination.
Can I get a Boiler Upgrade Scheme grant for the Daikin X Series?
Eligibility has not yet been established. The system’s product certification and classification under the scheme must be confirmed before assuming that a grant is available.
Is the Daikin X Series better than installing two separate systems?
Not necessarily. One combined outdoor system may reduce equipment duplication, but separate systems can provide independent operation and additional design flexibility. The most appropriate solution depends on the property’s heating and cooling requirements, operating temperatures, equipment positioning and available budget.
Independent Heat Pump Design from Heat Loss Hub
Considering the Daikin X Series for Your Home?
New heat pump technologies can provide more options for homeowners, but they also make correct system design increasingly important.
The Daikin X Series is an interesting development because it combines traditional wet central heating with air-to-air heating and cooling.
However, whether it is suitable for a particular property depends on much more than its headline specifications.
Before selecting any combined heating system, it is important to establish:
- The property’s room-by-room design heat losses.
- The heating capacity required through radiators and underfloor heating.
- Which rooms require air-to-air heating or cooling.
- The appropriate operating temperatures.
- Domestic hot water storage and recovery requirements.
- The manufacturer’s simultaneous-operation limitations.
- Electrical, refrigerant pipework and outdoor-unit positioning requirements.
Heat Loss Hub provides independent heat loss calculations and heating system design services throughout the UK.
We don’t sell heat pumps or undertake installations, allowing us to assess different manufacturers and technologies according to the property’s requirements.
Whether you’re considering the Daikin X Series, Samsung EHS Quint or a conventional air-to-water heat pump, we can help you understand the technical options before committing to equipment or installation work.
Get the design right before choosing the heat pump
Discuss your property, your intended heating and cooling requirements and the equipment you are considering. We reply personally — no sales calls.
Alternatively, email hello@heatlosshub.co.uk with details of your property and proposed installation.
Technical Sources and Further Reading
The information in this article has been developed using publicly available manufacturer information and UK certification and grant guidance.
Manufacturer information
- Daikin Europe – Official X Series Announcement
- Daikin – 5XXM-A Outdoor Unit Technical Specifications
- Daikin – CHVX-A / 5XXM-A Heating Performance
- Daikin – CHVX-A Hydraulic Unit Specifications
UK certification and grants
- MCS Product Directory
- Ofgem – Boiler Upgrade Scheme Product Eligibility List
- Eurovent – Daikin Multi-split and Multi+ MCS Announcement
Last researched: 9 October 2026
Heat Loss Hub is independent of Daikin and Samsung. This article is intended to provide technical information and design considerations rather than an endorsement of any particular manufacturer or product. Technical specifications, certification status and product availability may change.
CONTENTS
- Opening
- Daikin X Series UK Status
- What Is the Daikin X Series?
- Technical Specifications
- How Much Heating Can It Deliver?
- Heat and Cool Simultaneously?
- Flow Temperatures, Radiators & UFH
- Domestic Hot Water Production
- How Efficient Is It?
- Installation Requirements
- UK Availability
- Is It MCS Certified?
- Boiler Upgrade Scheme
- Advantages and Limitations
- Which Properties Could Suit It?
- Daikin X Series vs Samsung EHS Quint
- Frequently Asked Questions
- Independent Heat Pump Design
- Technical Sources
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