UK's Trusted Heat Pump Installer 
Excellent 
About HitachiHitachi Air Source Heat Pump Models1. Hitachi Yutaki M Air Source Heat Pump2. Hitachi Yutaki S Air Source Heat Pump3. Hitachi Yutaki S Combi Air Source Heat Pump4. Hitachi Yutaki H / R290 Air Source Heat PumpHow Efficient Are Hitachi Air Source Heat Pumps?How Much Does a Hitachi Air Source Heat Pump Cost?What Are the Running Costs of a Hitachi Heat Pump?Are Hitachi Air Source Heat Pumps Noisy?Are Hitachi Heat Pumps Suitable for Existing Homes?Hitachi Air Source Heat Pumps Pros and ConsIs a Hitachi Air Source Heat Pump Worth Considering?Hitachi Air Source Heat Pumps FAQs
About HitachiHitachi Air Source Heat Pump Models1. Hitachi Yutaki M Air Source Heat Pump2. Hitachi Yutaki S Air Source Heat Pump3. Hitachi Yutaki S Combi Air Source Heat Pump4. Hitachi Yutaki H / R290 Air Source Heat PumpHow Efficient Are Hitachi Air Source Heat Pumps?How Much Does a Hitachi Air Source Heat Pump Cost?What Are the Running Costs of a Hitachi Heat Pump?Are Hitachi Air Source Heat Pumps Noisy?Are Hitachi Heat Pumps Suitable for Existing Homes?Hitachi Air Source Heat Pumps Pros and ConsIs a Hitachi Air Source Heat Pump Worth Considering?Hitachi Air Source Heat Pumps FAQs
Hitachi is a well-established heating and air conditioning manufacturer with a range of air source heat pumps designed to deliver home heating and domestic hot water.
In this Hitachi air source heat pump review, we'll look at the main product ranges, compare their features and efficiency, and explain what homeowners should consider when budgeting for an installation.
We'll also cover the factors that influence running costs and help you assess whether a Hitachi heat pump could be a suitable alternative to a conventional gas or oil boiler.
Considering a heat pump for your home? Complete the form below to receive a free heat pump quote from one of our specialists:
Hitachi has an international presence in heating, ventilation and air conditioning (HVAC), supplying equipment for residential and commercial applications. Its heating products include air-to-water heat pumps, which extract energy from outdoor air and transfer it into water for use in a property's heating system.
The company's Yutaki range is designed to provide an alternative to conventional boiler-based heating. Depending on the chosen model, a system can supply heat to underfloor heating circuits or radiators and produce domestic hot water through a compatible cylinder or integrated hot water arrangement.
One feature of Hitachi's offering is the variety of system configurations available. Monobloc models contain the main refrigerant circuit within the outdoor unit, while split systems use separate outdoor and indoor units connected by refrigerant pipework.
This distinction can influence installation requirements, available indoor space and the work involved in connecting the heat pump to the property's existing heating system.
Hitachi also uses inverter-driven compressor technology across its heat pump ranges. This enables the unit to vary its output in response to demand rather than relying exclusively on repeated full-power operation.
For homeowners, the most important considerations are the model's heating capacity, seasonal efficiency, compatibility with existing radiators and the right heat pump installer.
Hitachi's residential air source heat pumps are sold under the Yutaki name, with several ranges and configurations available across different product generations.
The main families to consider include the Yutaki M monobloc, Yutaki S split system and Yutaki S Combi, which incorporates domestic hot water storage into its indoor unit. Newer R290 models also provide an option for homeowners looking at heat pumps that use a natural refrigerant.
The table below provides an overview of these systems. Exact specifications depend on the model code, generation and system configuration, so the figures should be confirmed against the equipment being quoted:
| Heat Pump Range | System Type | Refrigerant | Main Characteristics |
|---|---|---|---|
| Hitachi Yutaki M | Monobloc | R32 or R290, depending on generation | Self-contained outdoor refrigerant circuit, inverter operation and a range of heating capacities |
| Hitachi Yutaki S | Split system | R32 or R410A, depending on generation | Separate indoor and outdoor units, flexible system layouts and options for heating and hot water |
| Hitachi Yutaki S Combi | Split system with integrated hot water storage | Depends on model generation | Combines the heat pump's indoor equipment with a domestic hot water cylinder |
| Hitachi Yutaki H / R290 configurations | Hydrosplit or related configuration, depending on model | R290 on the relevant models | Newer system architecture using a natural refrigerant, with compatible indoor modules |
The Yutaki M and Yutaki S are not simply different sizes of the same appliance. Their system layouts and installation requirements differ, and the appropriate choice depends on the property and the available space.
System type: Monobloc air-to-water heat pump
Available configurations: Several output options, including smaller R32 models and larger units in other generations
Key features:
The Hitachi Yutaki M is worth considering if you’re looking for a monobloc air source heat pump. This type of system keeps the refrigerant circuit in the outdoor unit, with water carrying heat into your home.
As the heat pump transfers heat directly to water, you don’t need a separate indoor refrigerant unit. This can make the indoor installation simpler, depending on your property and heating system.
The Yutaki M range includes models with different heating outputs to suit different properties. For example, some R32 models have nominal heating outputs of around 4.3kW and 8kW, while higher-output options are available in other configurations. The right size will depend on how much heat your home needs.
It’s also important to distinguish between nominal and maximum heating output. Maximum output can be higher, so your installer should check the performance figures for the specific model when deciding which unit is suitable for your home.
Energy efficiency is another important factor. Certain Yutaki M models have an A+++ energy rating for space heating when operating with a water flow temperature of 35°C. However, this rating varies by model and operating conditions, so it’s worth checking the specifications of the unit you’re considering.
Lower water temperatures can help a heat pump operate more efficiently. This can work particularly well with underfloor heating or larger radiators. If your home needs hotter water to stay warm, the heat pump may use more electricity to provide the heat you need.
Some newer Yutaki M models use R290 refrigerant, also known as propane. It has a much lower global warming potential than R32, making it a more environmentally friendly option in terms of refrigerant impact. However, not every Yutaki M model uses R290, so check the exact model specifications before making a decision.
Overall, the Hitachi Yutaki M offers a practical option for homeowners looking for a monobloc heat pump, with different configurations to suit a range of heating needs.
System type: Split air-to-water heat pump
Available configurations: Multiple sizes and indoor unit combinations
Key features:
The Hitachi Yutaki S is a split-system air source heat pump designed to provide heating and hot water for your home. It uses an outdoor unit connected to indoor equipment, which transfers heat into the water used by your heating system.
Unlike the Yutaki M monobloc, the Yutaki S uses refrigerant pipework to connect the indoor and outdoor units. This means the heat pump transfers heat through refrigerant to the indoor unit, which then heats the water circulating around your home.
The split design can offer more flexibility when planning an installation. The position of the indoor and outdoor units can be arranged to suit your property, available space and existing heating system. However, the refrigerant pipework must be installed by an appropriately qualified professional.
The Yutaki S range includes models with different heating outputs, from smaller units for homes with lower heating needs to higher-output options for properties requiring more heat. Specifications vary between models and generations, so check the exact model and its performance figures when comparing quotes.
Energy efficiency is another factor to consider. Some Yutaki S models have an A+++ energy rating for space heating when operating at a water flow temperature of 35°C. The rating depends on the specific model and operating conditions, so it’s important to check the manufacturer's specifications for the unit you’re considering.
The temperature your heating system needs can also affect efficiency. The Yutaki S may work particularly well with underfloor heating or larger radiators that can heat your home using lower water temperatures. If your existing radiators need hotter water to keep your home warm, the heat pump may use more electricity.
Refrigerant type is another point to check when comparing Yutaki S models. Different generations use different refrigerants and can have different operating limits and efficiency levels. Ask your installer to confirm the refrigerant and specifications of the exact model being proposed.
Overall, the Hitachi Yutaki S is worth considering if you want a split-system heat pump that can be arranged around your property's layout. The best model for your home will depend on your heating needs, the water temperatures required by your radiators or underfloor heating, and the performance of the specific unit.
System type: Split heat pump with integrated domestic hot water storage
Key features:
The Hitachi Yutaki S Combi is designed for homeowners who want to combine their home heating and hot water system in one indoor unit.
With some heat pump systems, the indoor equipment and hot water cylinder are installed separately. The Yutaki S Combi brings the hot water cylinder into the indoor unit, helping to keep the system together in one place.
This can be useful if you’re replacing a boiler with an air source heat pump and want to keep your existing central heating system. However, you’ll still need enough indoor space for the unit, as well as room for the outdoor heat pump and access for future maintenance.
Choosing the right hot water capacity is important. The amount of hot water your household needs will depend on how many people live in your home and how much hot water you use at the same time. Your installer should assess these needs alongside your home's heating requirements to recommend a suitable system.
As with other Hitachi Yutaki heat pumps, efficiency and performance depend on the specific model and how the system is installed. Check the manufacturer's specifications for heating output, energy ratings, refrigerant type and hot water performance before making a decision.
Overall, the Hitachi Yutaki S Combi is worth considering if you want your heating equipment and hot water cylinder combined in one indoor unit. However, it may not be the best option if indoor space is limited or you would prefer to install a separate hot water cylinder.
System type: Monobloc R290 heat pump with a compatible hydrosplit indoor unit
Refrigerant: R290 (propane)
Key features:
The Hitachi Yutaki H is a newer air source heat pump range that uses R290 refrigerant and a monobloc design. The outdoor unit transfers heat from the air into water, which then circulates through your home's heating system. This means refrigerant pipework does not need to run between the outdoor unit and the indoor equipment.
One of the main features of the Yutaki H is its use of R290 refrigerant, also known as propane. It has a global warming potential (GWP) of around 3, which is much lower than that of refrigerants such as R32 and R410A. This makes it a lower-impact option in terms of refrigerant emissions.
The Yutaki H uses an indoor module designed to work with its matching outdoor unit. If you also need a hot water cylinder, the UK version of the Yutaki H Combi includes a 220-litre cylinder. This allows you to combine your home heating and hot water equipment in one indoor unit.
As with other heat pumps, the Yutaki H's efficiency depends on factors such as the outdoor temperature, the water temperature your heating system needs and how much heat your home requires. Check the performance figures for the specific model to understand how efficiently it could heat your property.
R290 is a highly flammable refrigerant, so the outdoor unit must be installed in a suitable location and meet Hitachi's safety requirements. Your installer should account for the necessary clearances and positioning when planning the installation.
Overall, the Hitachi Yutaki H is worth considering if you're looking for a newer heat pump that uses a low-global-warming-potential refrigerant. The Combi version may also suit you if you'd prefer an integrated hot water cylinder. The right option will depend on your home's heating needs, available space and hot water usage.
Hitachi heat pumps can achieve high seasonal efficiency ratings, although performance varies between models and installation conditions. Some Yutaki systems have an A+++ energy rating when tested at a 35°C water flow temperature.
A heat pump's coefficient of performance (COP) describes how much heat it produces for each unit of electricity consumed under specified conditions. For example, a COP of 4 means the appliance produces 4kWh of heat for every 1kWh of electricity used during the test.
However, the COP is measured at particular outdoor and water temperatures. It should not be treated as a guaranteed annual performance figure.
Seasonal coefficient of performance (SCOP) provides a more representative indication of efficiency across a heating season. Even then, actual household performance will depend on insulation, weather conditions, heating controls, hot water demand and the temperature required by the radiators or underfloor heating.
For the best results, the heat pump should be sized using a room-by-room heat-loss calculation and installed with a heating system that can deliver comfortable temperatures without unnecessarily high flow temperatures.
The installed price of a Hitachi air source heat pump depends on the model, the property's heating demand and the amount of work needed to integrate the system with the existing heating infrastructure.
The main cost factors include:
A straightforward installation in a well-insulated property may cost considerably less than a project involving substantial plumbing changes, new radiators or upgrades to the electrical supply.
It's also worth comparing the complete installed system rather than the outdoor unit price alone. A quotation should explain which components are included, the expected scope of work, commissioning arrangements and the warranty terms.
For homeowners in England and Wales, the Boiler Upgrade Scheme may help reduce the upfront cost of an air source heat pump installation. Eligibility, grant amounts and scheme requirements should be checked at the time of application.
The running costs of a heat pump depend on how much heat the property needs and how efficiently the system supplies it.
A well-insulated home with appropriately sized radiators or underfloor heating may require less electricity to maintain comfortable temperatures than a property with substantial heat loss or a heating system that needs consistently high water temperatures.
The main factors affecting electricity consumption include:
To estimate annual heating electricity use, divide the expected annual heat demand by a realistic seasonal performance factor.
For example, if a property requires 12,000kWh of useful heat annually and the system achieves a seasonal performance factor of 3, the estimated electricity consumption for supplying that heat would be approximately 4,000kWh. This is an illustrative calculation, not a prediction of the performance of a specific Hitachi installation.
The electricity tariff then determines the approximate cost. A proper assessment should also account for hot water, any supplementary electric heating and the property's actual usage patterns.
Noise is an important consideration when choosing any outdoor heat pump, especially where the unit will be installed near a bedroom window, neighbouring property or outdoor seating area.
Hitachi publishes acoustic specifications for its individual models, but these figures need to be interpreted carefully. Sound power and sound pressure are different measurements, and the apparent noise level at a particular location depends on distance, surroundings and installation conditions.
When planning an installation, the outdoor unit should have sufficient airflow and comply with applicable noise requirements. Positioning it against reflective surfaces or close to neighbouring windows may increase the impact of operating noise.
A Hitachi air source heat pump can be suitable for an existing home, provided the equipment and heating system are designed around the property's requirements.
Underfloor heating is generally well suited to heat pumps because it can deliver comfortable room temperatures using relatively low water temperatures. Radiators can also work effectively, although some properties may need larger radiators or other improvements to reduce the required flow temperature.
Before replacing a boiler, an installer should assess the property's heat loss, insulation, existing emitters, hot water requirements and available space for the indoor and outdoor equipment.
Older homes are not automatically unsuitable for heat pumps. However, a poorly sized heat pump or one connected to radiators that require excessively high flow temperatures may have higher running costs than expected.
A detailed design and a clear explanation of the proposed system are therefore more useful than choosing a model based on its headline output or efficiency rating alone.
Potential advantages
Potential considerations
Related Reading:
Hitachi is worth considering if you're looking for an air source heat pump with a choice of system configurations and heating capacities.
The Yutaki M may appeal to homeowners who prefer a monobloc design, while the Yutaki S offers a split-system alternative. The Yutaki S Combi is another option where integrated hot water storage is desirable.
There is no single best Hitachi model for every property. The right choice depends on the home's heat demand, available installation space, hot water usage, heating emitters and budget.
Before making a decision, compare the proposed model's seasonal efficiency, output at lower outdoor temperatures, acoustic data, warranty conditions and total installed cost. It's also sensible to obtain quotations from suitably qualified installers who can explain how the system will perform in your particular home.
Ultimately, the quality of the system design and installation is just as important as the manufacturer. A correctly sized and commissioned Hitachi heat pump can provide an effective alternative to a conventional boiler, but the expected performance and financial benefits should be assessed on a property-by-property basis.
Related Reading:
A Hitachi air source heat pump can typically last around 15 to 20 years, although its lifespan will depend on operating conditions, installation quality and maintenance. Keeping the system well maintained and addressing faults promptly can help extend its life.
Hitachi heat pumps should be maintained in accordance with the manufacturer's recommendations and the terms of the installation warranty. An annual professional service is a sensible approach for checking components, electrical connections, controls and overall system operation.
Yes, Hitachi air source heat pumps are designed to extract heat from outdoor air even when temperatures are low. However, heating output and efficiency can decrease as outdoor temperatures fall, and the system may periodically run a defrost cycle to remove ice from the outdoor heat exchanger.
Warranty coverage depends on the specific Hitachi model, the supplier and the installation arrangements. Ask your installer to confirm the applicable warranty period, what parts and labour are covered, and whether product registration or scheduled servicing is required to maintain the cover.
Some Hitachi air source heat pump models support cooling as well as heating, but this capability depends on the equipment and system configuration. The property's emitters and controls must also be suitable for cooling operation, so confirm compatibility with your installer.
