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The Hitachi Yutaki S Combi product photo

The Hitachi Yutaki S Combi is compact and powerful. (Image credit: Hitachi Aircon)

Hitachi Yutaki S air source heat pumps can produce hot water between 60°C. It is a great heat pump system to purchase as a boiler and heating system in a new build because it is highly energy efficient, easy to control and use, and can operate in very cold conditions of -20°C. 

The Hitachi Yutaki S Combi range includes the S 2 Combi (with outputs from 1.85kW – 6.5kW), the Yutaki S 3 Combi (with a maximum output of 8.6kW), the Yutaki S 4 Combi (with a maximum output of 15.2kW), Yutaki S 5 Combi (16.7kW maximum output) and the Yutaki S 6 Combi (with a maximum output of 17.8kW).

Its hot water recovery time is similar to that of a traditional boiler, but there are plenty of extra benefits. 

The unit automatically compensates according to the temperatures outside to maintain comfort levels at all times. A 185- or 250-litre hot water tank can be added so that hot water is available on-demand at all times, and the unit can be connected to solar panels to lower the carbon footprint and electricity consumption even further. 

The units are compact and efficient, with wireless controls that enable you to manage your system from wherever you are. You can also place the system into holiday mode while you are away. 

If you care about efficiency and cutting down your electricity bill, the Hitachi Yutaki S series has an A+ ErP rating (Energy rated Performance) and can potentially cut down your electricity costs by a significant amount. 

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Technical information

The Hitachi Yutaki S Combi air source heat pump produces hot water of up to 60°C, with an option to add passive cooling functionality as well. It also features weather compensation control, multiple heating and cooling settings, solar integration capabilities and an optional 185- or 250-litre domestic hot water tank. 

  • Guarantee options: 3-7 years
  • Price range: £4,000-£7,000
  • Efficiency: A+
  • Max power: 17.8kW
Hitachi range of energy efficient, attractive heat pumps

Hitachi offers a range of energy efficient, attractive heat pumps. (Image credit: Hitachi Aircon)

Key features

Highlights:  High output and efficiency of up to A+ (depending on the unit) mean that the Hitachi Yutaki is one of the most powerful and cost-effective on the market.

Key benefit:  Hitachi Yutaki S Combi air source heat pumps are compact and powerful, making them suitable for most homes. 

Maximum flow temperature: 60°C 

Minimum temperature: -20°C 

Pros and cons 

Like all air source heat pumps, the Hitachi Yutaki S Combi has its own advantages and disadvantages that need to be considered before a decision can be made. Some of the advantages include: 

  • Excellent efficiency and lower carbon footprint: Hitachi Yutaki S Combi air source heat pumps extract renewable energy from the air, using 1kW of electricity to produce 4kW of heat. Hitachi claims they can reduce energy bills by as much as 60%. 
  • Easy to use controls: A wireless remote thermostat or handy smartphone app enables users to set weekly timers and introduce holiday mode or favourite functions to stay on top of their heating needs. 
  • Hot water on demand: Hot water of up to 60°C can be produced and stored in a domestic hot water tank to ensure you never have to wait for a hot shower again. 
  • Pre-wired for installation: The Hitachi Yutaki S Combi arrives pre-wired, so installation is quick and easy. 

There are some disadvantages to the Hitachi Yutaki S Combi to bear in mind, though: 

  • Cost: There are cheaper models on the market with similar outputs to the Hitachi Yutaki S range. 
  • Size: With a water tank attached, the Yutaki S Combi is quite bulky, which makes it difficult to install in smaller homes.

How do Hitachi Yutaki S Combi air source heat pumps work?

Hitachi Yutaki S air source heat pumps transform the air outside your home into usable heat through refrigeration and vapour compression. Typically you would need a dedicated heat pump hot water cylinder with a larger coil surface area to complement your unit – it is available through Hitachi as well, but the Combi is a pre-plumbed and pre-wired product, which makes it easy to install.

hitachi heating app on an iphone

Heating can be managed via a remote smartphone app (Image credit: Hitachi)

How do Hitachi Yutaki S Combi air source heat pumps compare to other heat pumps? 

There are several other heat pumps comparable to the Hitachi Yutaki S Combi in terms of price and performance. If you are interested in a high-performance unit, you should consider the Hitachi Yutaki S80, which can heat water up to 80°C, offers outputs of 32kW and comes with an A+++ efficiency rating. 

If you don’t want to stick with the Hitachi brand, however, consider the LG THERMA V. We were impressed with its powerful 16kW output, favourable price tag and its compact design. If you live in very cold climates, however, you would do better with the Daikin ALTHERMA 3, which can handle temperatures of -25°C with ease (although it is more expensive). 

We can also recommend the Mitsubishi Ecodan Monobloc, an all-in-one air source heat pump which comes with a good price tag and excellent efficiency. 

How much does the Hitachi Yutaki S Combi air source heat pump cost?

The Hitachi Yutaki S Combi is a mid-range air source heat pump. The heat pump comes with a 3 year guarantee that can be extended to seven years if fitted by an improved installer, which is an important consideration when making a decision based on the cost. On the downside, the warranty is not as lengthy as some of the other brands offer. 

Here’s how it compares to some of the others on the market:

ManufacturerCost (excluding installation and labour)
Hitachi Yutaki S Combi£4,000 — £7,000
LG Therma£3,255 – £6,300
Mitsubishi Ecodan Monobloc£3,800 – £5,800

Maintaining Hitachi Yutaki S air source heat pumps

The Hitachi Yutaki S doesn’t require a good deal of maintenance, although we have seen some online reviewers complain about insects and geckoes entering and obstructing the unit. It’s a good idea to check your unit regularly to make sure that dust and debris aren’t blocking the airflow. A qualified technician can assist with annual servicing. 

Simple obstructions can be removed by turning off the unit and checking the fan blades regularly.

Hitachi Yutaki S Combi air source heat pump add-ons

Hitachi Yutaki S Combi air source heat pumps come with a controller and either a 185- or 250-litre cylinder domestic water tank. Solar panels can be added at a buyer’s own cost and have to be purchased separately. The remote control is included, but a cooling kit and a second temperature kit can be purchased. The second temperature kit is only compatible with the Yutaki S Combi 250L tank.

What the professionals say

“Hitachi Yutaki heat pumps work by transforming energy from outside air into heat for your use. Every 1 kW of electricity generated can provide up to 5 kW of energy in a well-insulated home. This then helps to reduce heating bills and cuts CO2 emissions by 70% compared to traditional boiler-led systems.

“Hitachi heat pumps require significantly less fossil fuels (such as gas and oil), and you can also save up to 60% on running costs, providing a convenient and compact renewable energy solution.”

Customer reviews

“Local Technician, customer care Executive and all are playing some tricky games; no one is responding, you call them 100 times and each and every time, they give some different answers and excuses too. “

“Most useless heat pump ever, never work well…freezing cold, yet it decides to stop… So angry with the guy who talked me into this product. Hate this; I want to kick it soo bad.”

Final recommendation

The Hitachi Yutaki S Combi is a good air source heat pump for new builds and projects. They are easy to install (pre-plumbed and set up), efficient and affordable to run. It comes with a large water cylinder that ensures hot water on demand and operates well in colder climates. 

While the 16kW is generous, it’s not recommended for larger homes as it doesn’t have the power to provide hot water for multiple bathrooms. However, if you own a mid-sized home and would like the convenience of a hot water cylinder, the Hitachi Yutaki S Combi is a solid bet. Larger homes would do well with the Hitachi Yutaki S80, which offers even greater efficiency, extremely warm water and significant outputs.

Our methodology 

To compile this review as accurately as possible, we first reviewed hundreds of online customer reviews from various sites, including Google Reviews, Trustpilot and others. We consulted professional forums, and technical documentation and reviewed media articles related to the Hitachi Yutaki S Combi as well. 

We then compiled a scoring system to rate the Hitachi Yutaki S Combi air source heat pump against, which comprised the following: 

  • The warranty period offered by the brand, for a total of 10 points;
  • The overall reputation of the brand is based on online reviews, for a total of 15 points;
  • Trustpilot reviews for a total of 5 points;
  • Awards and accolades (e.g. Which? Best Buy Awards) for a total of 5 points;
  • Customer service performance, for a total of 10 points;
  • The price range, for a total of 15 points;
  • Efficiency ratings, for a total of 15 points; 
  • Installation and maintenance network and reviews, for a total of 15 points; and
  • Overall performance, for 10 points. 

The Hitachi Yutaki S Combi was rated out of a total of 100 possible points.

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