Rinnai, the world’s leading manufacturer of continuous flow hot water systems, is introducing the Sensei N Series to the UK marketplace, as the new generation of maximum quality and reliability in hot water heating delivery.

The new Rinnai Sensei N Series water heater range offers a new and more compact and enhanced combustion design that allows for easier installation and enhanced operational performance together with increased levels of serviceability.

All components in the range are designed and manufactured by Rinnai, and this ensures maximum quality and reliability from the industry leader in commercial continuous flow water heating products and systems.

The Rinnai Sensei N Series is the first ever continuous flow hot water heating unit manufactured with stainless steel heat exchangers to be available in the UK – this gives a greatly extended working life at optimum performance to each of the four models in the range. Added to this is the Sensei N Series market leading extended warranties.

The four models are: the N1600i giving 954 litres per hour; the N1600e (external) also giving 954 litres per hour (at 50 degrees); the N1300i giving 775 litres per hour and the N1300e also giving 775 litres per hours of temperature controlled at 50 degrees. The two 1600s have load profiles of XXL and are water efficiency class A rated, while the 1300s are load profile XL and are also water efficiency class A rated.

Other features include:

  • flue up to 30+ metres for concentric
  • Turbo Fan
  • Built-in controller as standard on both internal and external models
  • Cascade Cable assembly allows up to 24 water heaters to be connected and function as one total and complete system Any number of N-series Rinnai water heaters can be manifolded together enabling the largest capacities on the market.
  • Built in flue damper
  • Air inlet filter
  • Frost Protection – minus 15°C on the internal versions and minus 20 °C on the external versions
  • New PCB Design
  • Controller as standard – Lockable, set up of appliance, Temperature set up to 75°C
  • Maintenance Monitor for engineers

Rinnai manufactures over 2 million hot water heating units each year and so can offer advantageous cost savings for installers and end users. The N Series are probably the most competitively priced type of their kind currently available to the UK sector.

All the range are also low-NOx and the Sensei N Series utilises Rinnai’s patented advanced burner technology with a 13-1 turn down ratio – the largest on the market – with extremely quiet operation. Integral controls on the units enable the water heater to achieve high efficiencies because of advanced burner control and high modulation ranges.

In reducing Legionella proliferation, Rinnai has developed additional ‘SMART’ controls for secondary return DHW systems in the form of an advanced temperature control system which allows for safe running of water at 42°C core temperature during the day and 60°C overnight.

The advanced burner controls with the Sensei N Series models ensure that all the appliances are well ahead of the NOx requirements set within ErP. The current level of permissible NOx set by ErP is 56 mg/Kwh. The Sensei N Series range have been third-party tested at 28 mg/Kwh making them one of the greenest water heating appliances available.

As the units do not incorporate storage their ‘green credentials’ are further recognised by BREEAM and score additional credits under the building regulations.

The industry uptake of Rinnai’s continuous flow heater systems are proven to be more energy efficient than conventional storage systems and are increasingly the experts’ preferred method of hot water provision. Rinnai units easily cater for any size projects that need high volumes of water at intermittent times of day.


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Rinnai, designer and manufacturer of the A-rated Infinity range of Infinity continuous flow condensing gas fired water heaters, supplies the best energy efficient range of low-NoX water heaters on the market.

Advanced condensing heat exchangers combined with innovative down firing pre-mix burner technology ensure every cubic metre of natural gas or LPG is utilised to the maximum in the Infinity HDC 1600e. The units are renewables-ready and suitable for use as a temperature booster for solar thermal and heat-pump installations. The HDC1600e is also future-proofed against future regulatory and legislative changes.

The renewables-ready low-Nox Infinity HDC 1600e external wall mounted boiler along with the interior HDC 1600i version) utilises Rinnai’s patented pre-mix burner technology with a 14-1 turn down ratio – the largest on the market – of 58.4kw-4.05kw and is ultra quiet in operation.

Integral controls on the units are also a major step forward in achieving best efficiencies whether locally or when integrated into a building management system. Legionella proliferation is also significantly reduced too.

Rinnai has also invented additional ‘SMART’ controls for secondary return DHW systems in the form of an advanced temperature control system which allows for safe running of water at 42°C core temperature during the day and 60°C at a time when the building is closed. By the time the building reopens, core temperature is 42°C for safe use.

“The uptake on the whole series of Rinnai’s low-NoX, high efficiency product, across all sectors, has been nothing short of phenomenal,” says Rinnai UK Associate Director Chris Goggin.

Rinnai Infinity HDC range offers condensing technology with up to 107% gross efficiency, ultra-low-Nox of less than 20 ppm, a widely expansive modulation range of 54kW-4kW and high flow rates of 37/ltr/min. Add to these benefits the peace of mind of an extended warranty, a top A-rating exceeding the demands of eco-labelling legislation, the flexibility of external wall mounting and delivery to site with all relevant accessories and the knowledge that the HDC1600e is future-proofed against future regulatory and legislative changes and it is easy to see why the Rinnai brand is fast growing in popularity among H&V professionals.

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Rinnai is a registered provider of CPD courses, which it has developed over the past few years, earning praise from the CPD Certification Scheme for the design of the courses. The manufacturer has seen an upswing in demand for its training as specifiers and engineers alike have switched on to the energy saving benefits of the A-rated Rinnai Infinity range.

Rinnai’s qualifications as a provider of CPD courses are impressive: as the UK and European market leader in the supply of gas fired continuous flow water heaters for commercial, domestic and renewable integration, Rinnai is at the forefront of innovative and efficient systems and technology.

As Rinnai UK Managing Director Tony Gittings explains: “The UK water heating industry is facing a myriad of environmental and politically driven market forces, including the need to reduce carbon emissions within new and existing buildings. In the training modules we clarify and engage with the market to assist decision making and understanding of the different messages faced by today’s engineers, installers and designers.

“Rinnai can demonstrate how innovation can reduce the burden on fossil fuels while maximising renewable gains. We also look at the growing support for continuous flow technologies and how this can benefit the industry versus traditional gas fired storage systems and analyse water heating design and specification discussing technical issues associated with product installation.”
“Our training facility and CPD training courses ensure key market personnel at all levels can benefit from nationwide training from our highly skilled team of technical experts. Ensuring they are up to speed with changes in legislation and product developments. Rinnai can also deliver bite-size one- hour courses to suit your needs,” says Rinnai associate director Chris Goggin.

For installers, specific hands-on training can be tailored to cover all aspects of commissioning and servicing processes. The Runcorn training facility has recently been redesigned and enlarged to cope with demand and is fitted with all the latest Rinnai technology so attendees can be assured they are gaining experience on the latest energy saving appliances and systems.

These training events are aimed primarily at engineers and facilities managers. The courses don’t just look at the individual units but also explore system design and how to deal successfully with legionella. The most popular course modules are ‘Understanding ACOP L8 and hot water system design’ and ‘System design incorporating continuous flow and renewables’.

Engineer courses are held on the first and last Thursday of each month at Runcorn. More courses are in the process of being added, including one on the new Rinnai Infinity Solo, which is now awaiting CPD accreditation.

The comprehensive engineer training course line-up for 2017 includes nine modules: Rinnai product overview; Continuous flow and the future of water heating; Intermediate water heater; Continuous flow – Excellence in design; Service and fault diagnostics (Water heaters); Service and fault diagnostics (Energy saver warm air units); Understanding ACOP L8 and hot water system design; Maximising renewable gain in hot water design; and, Continuous flow as an innovative method of satisfying energy and regulatory demands.

CPD Roadshow courses are also available for M&E consultants and specifiers, design and build engineers, facilities managers and gas contractors.

For more information contact Ian Jenkins on +44 (0)1928 531 870 or email

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Rinnai, manufacturer of the energy efficient range of Infinity continuous flow water heaters, recently stepped in to ensure a recent BBC Countryfile event in the grounds of historic Blenheim Palace had a plentiful supply of hot water for its catering outlets.

Managing director for Prestek Services in Derbyshire, John Webster, no stranger to providing water for Blenheim Palace outdoor events, was called in to supply the means to provide hot water to the various catering operations dotted around the grounds.

Originally a kitchen and bathroom fitter, John has built a business providing water for events since first supplying a festival in 2001 and feels he has found his niche. “By its nature the events market is a small community so most of my work comes though word of mouth from relationships that have sometimes been 20 years building.” He believes the backbone to that trust is in providing reliable systems that work.

“I have used Rinnai hot water heating units for some time,” he says, “and believe they are the only ones suitable for this kind of work. They are a tried and tested solution. I first came across Rinnai units at an equestrian event around 10 years ago where they were being used for the mobile shower units. The customers loved them. Having seen the units in action I decided to purchase Rinnai for my own business.”

He explains that he has a fleet of hot water units that he can roll out whenever needed. “I have six Rinnai units running on LPG gas which are configured on to a T-stand, linked to the cold water supply and then linked to a sink in the wash-up area. It is an ideal arrangement for a temporary potwash area.”

At Blenheim Palace he was able to site individual wash up areas around the show area by linking them to a temporary system of pipework several kilometres long. “We simply had to build the network, link pipework and gas cylinders to the boilers, add a sink, and the caterers all had instant hot water.”

“All went well with no complaints from the caterers who had as much hot water as they desired. Which, let’s face it, is exactly what was required.”

The Rinnai units will never run out of temperature safe hot water all the time they are connected to a water supply. The burner lights automatically when the hot water tap is opened, and extinguishes when the tap is closed. Ignition is electronic so there is no pilot light. When the hot water tap is off, no gas is used.

As far as John is concerned for his kind of work he needs a product that is reliable, quick to set up and gets going with no worries. “Which is why we use Rinnai. You could say, they do what it says on the tin.”

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Rinnai’s Infinity Plus Cascade is a major move into bigger sites and applications which have a high demand for hot water and energy efficiency, the design parameters of the cascade systems mean that upgrading the traditional water heater to a technologically advanced continuous flow system is simple.

Rinnai, leading innovators in the manufacture of continuous flow water heaters, can now offer commercial hot water provision which is virtually limitless in this custom-made solution with a choice of either two unit or three unit modules of its award-winning condensing continuous flow water heaters.

Infinity Plus Cascade has been developed by Rinnai to guarantee high volumes of temperature accurate hot water. The design parameters of the cascade systems offer ease of integration into new and existing buildings even when retrofitting from traditional storage systems. The modules incorporate Rinnai’s proven energy-saving 1500 or 1200 condensing continuous flow water heaters with its newly developed common header flue system technology.

Infinity Plus Cascade is designed to deliver high efficiencies for the building operator whilst also streamlining the installation in one “turnkey package.” As any number of modules can be manifolded together, it is an ideal solution for large sites and for those applications – where there is a heavy demand for constant hot water.

Installers will find fitting the modules easy and straightforward as Infinity Plus Cascade comes with its own made to measure rack making installation simple and quick, and with no need for excessive rejigging of pipework. The compact footprint of Infinity Plus Cascade means it can be housed in a small space and still be easily accessible for maintenance and servicing.

Not only does the choice of Infinity Plus Cascade give highly significant cost savings over other forms of water heaters, but there also the added remedial work savings, for instance there is no need to knock through walls to cater for the movement of large cumbersome water heating equipment, valuable internal space can be created or saved.

Hot water downtime is also virtually eliminated as the modular nature of the system means that when service and maintenance is performed, elements of the system are still operational saving on service interruptions.

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Rinnai, the Japanese manufacturer of the award winning Infinity range of continuous flow gas fired water heaters, is encouraging installers and end users to purchase units only from reputable manufacturers with a proven pedigree in the UK. The company is adamantly defensive of product quality on behalf of the market place for end-users, contractors and consultants.

Rinnai has a reputation for innovation through design and quality focussed engineering, all built with the highest quality components and standards of exacting manufacture that guarantees a long and efficient working life.

According to Rinnai’s Yuji Omoto: ‘Installers should choose a unit from a proven manufacturer that has the confidence to offer warranties for a product that is built to last – and never buy on a price-only basis.

“Rinnai water heaters are engineered with innovative, electronic and mechanical components that have a statistically insignificant failure rate. It should be noted that Rinnai manufacturer all their own components ignoring global sourcing and keeping quality in house. It is because of this superior engineering that Rinnai units can modulate down to 2.4kw whilst boasting 107% efficiency making them the most efficient water heaters on the market today.”
The guarantee of energy efficiencies and long term reliability gives peace of mind to the domestic and commercial users, to whom water heating is an integral part of the building envelope, while additionally in commercial settings there are ever increasing regulatory constraints such as eco-labelling and building regulations.

Yuji Omoto says “In recent years it may seem that attention has been focused on renewables, but it has become apparent this technology, on its own, really isn’t delivering ¬ – at least, not in its current form.

“Now, widespread consultation has decreed that a vast array of technologies and existing energy supplies is key to achieving reduction targets. An energy efficient continuous flow gas fired hot water system, whether teamed with renewables technology (solar thermal or a heat pump) or used on own, actually has a lot to offer as we move towards the Government’s carbon neutral goals. Rinnai Infinity units have been developed to exceed all current demands and lead the field in this respect.

“The downside to this recognition is that inferior water heaters are beginning to appear on the market and they appear to have varying standards of quality in their manufacture. This is where the end user needs to take on board that a quality-built system which uses only the best components available and is precision engineered, is technically advanced and fit for purpose should be the defining criteria at time of purchase and any thought of buying on price alone should be challenged. After all, you get what you pay for…..”

Rinnai’s motto ‘Quality is our Destiny’ epitomises its healthy corporate obsession with quality. The basis for manufacturing and all aspects of the process at Rinnai is to think and act from a scientific perspective and the result is a market-oriented production system that combines policy management, quality control, and continuous improvement.

The process starts at Rinnai’s Japanese factories where stringent quality control protocols have been put in place that apply to the selection of the raw material from the smallest components through manufacture and assembly to delivery and after sales.

Rinnai applies Monozukuri technology and work methodology to its environmentally-friendly manufacturing activities. ‘Monozukuri’ applied to manufacturing and production means the ‘art, science and craft of making things’ and can be compared with the English word ‘craftmanship’. With this philosophy entrenched throughout the company Rinnai strives to add quality to its products from the design stage, mainly through simulations and applies verification methods to identify points for improvement and to prevent potential problems from ever happening.

Quality, innovative infinity heavy duty condensing water heaters* designed to be fit for purpose use two heat exchangers to capture residual heat from flue gases to pre-heat incoming water, and can deliver up to 107% net efficiency. Installers should also beware of appliances that even though they may claim HE technology in their publicity this is exemplified by burners that only modulate down to 6-7 KW. Burners on superior units using pre-mix technology can self-modulate down to an unbeatable 2.4 kW.

The design of the water heater, components and the engineering itself must be of the best quality available. It pays to research key specification and country of origin.

A technologically advanced PCB system ensures intelligent functionality, including temperature accurate hot water delivery, gas modulation guaranteeing efficient gas usage, numerous safety features for user comfort and control as well as error messaging and BMS interfacing. On a quality unit, the circuit board itself will be cased in silicone as a fail safe in the unlikely event of a leak the ‘brains’ of the unit are protected.

If installers and end users stick to the ‘quality is best’ rule they should be safeguarded in their choice. “The Rinnai system is obviously working as we have so few defects occur in product output. The company produced 6 million continuous flow water heaters in 2014 – a massive achievement,” concludes Yuji Omoto.

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