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Rinnai’s H3 range includes heat pumps: now available for domestic and commercial properties

Rinnai’s H3 range of decarbonising heating and hot water products feature heat pumps as an immediate low carbon option for domestic and commercial utilities. Heat pumps offer swift implementation of decarbonisation whilst providing a high standard of heating and hot water delivery. For in depth details on Rinnai’s heat pump range contact us today at:

A heat pump works by extracting heat from outside air and elevating its temperature using a compressor. Compressed heat is then dispersed indoors through radiators and underfloor heating. Residual heat is stored in a hot water cylinder used for showers and baths.

Both the compressor and pump mechanism accept electricity. If installed correctly on to an appropriate property a heat pump will prove to be an energy efficient, effective tool of decarbonisation that delivers satisfying levels of comfort to the end-user. Heat pumps ensure that all home heating and hot water dispersal will be sustainable and entirely carbon neutral.

Rinnai’s H3 range of heat pumps offer both commercial and domestic options that contain a variety of features: the HPIH range of commercial heat pumps suited towards schools, restaurants and small retail outlets can allow for up to 7 units to be cascaded together or operate alone as one unit. Once joined together Rinnai’s HPIH Monobloc Air Source Heat Pumps are capable of serving increased demand for heating and hot water.

The HPIH series includes a range of controls and system peripherals which ensure that all technical machinations can be monitored. Rinnai’s HPIH commercial heat pumps also deploy the refrigerant – R32, which contains a low GWP. The HPIH use maintains an ERP rating of A++ making this range of heat pumps an ideal economic and environmental option for future and refurbishment projects.

Rinnai’s HPHP series of domestic heat pumps arrive with the ability to save up to 25% of power input, enhancing efficiency and operational performance. The inclusion of DC inverter scroll compressors enable optimal performance throughout intense working conditions. State-of-the-art technology added in the injection process outperforms gas compression technology and ensures that even with outside temperatures of –25 Celsius, heating and hot water of up to 60 + Celsius can still be delivered.

Domestic heat pumps can also be purchased that are designed to omit little to no sound during operating. Rinnai’s HPI SL range models perform with ultra-low sound capability ensuring compatibility with areas that hold strict sound compliance standards. All units operate in 3 different modes: heating, cooling and DHW. All 3 modes include specific system programmes that enhances product performance in all modes.

Rinnai has also made hybrid heating and hot water solutions available for UK customers. A hybrid gas option brings together hydrogen blend-ready water heaters with heat pump technology creating an innovative first for commercial hot water options.

The combination of heat pump technology utilising R32 refrigerant combined with market-leading Hydrogen blend or Bio-LPG ready water heaters offers an economical, technical, and environmentally friendly solution to project needs.

All commercial and domestic carbon reducing energy demands can be met by Rinnai’s H3 range, BioLPG, rDME, heat pump, hybrid heat pump or solar power products. Rinnai’s entire offering of commercial and domestic heat pumps are now available to purchase.


Rinnai’s product and service offering is based on H3- Hydrogen, Heating and Heat Pumps – which allows any site in either residential or commercial sites to maximise the energy efficiency and performance in striving for NetZero and Decarbonisation. Additionally, Rinnai is developing and introducing electrical formats to all existing product ranges within the next few months. Rinnai’s new “H3” range of products includes a wide selection of commercial heat pumps as well as hydrogen blends-ready and hybrid hot water heating systems. 

Rinnai is a world leading manufacturer of hot water heaters and produces over two million units a year. The company operates on each of the five continents and the brand has gained an established reputation for high performance, robust cost efficiency and extended working lives.

Rinnai’s commercial and domestic hot water products offer a limitless supply of instantaneous temperature controlled hot water and all units are designed to align with present and future energy sources and accept either natural gas or hydrogen gas blends. Rinnai units are also suited for off-grid customers who require LPG and BioLPG or rDME.

Rinnai units are UKCA certified, A-rated water efficiency, accessed through multiple fuel options and are available for purchase 24/7, 365 days a year. Any unit can be delivered to any UK site within 24 hours. System design services are available if needed and cost comparison services are accessible to all customers who require further cost detail.

Rinnai’s Innovation Manifesto clearly outlines the path to carbon neutrality and maintains a pledge to fully decarbonize company operations by 2050. Rinnai will further support the global clean energy transition by introducing a wide variety of domestic heating options across multiple energy vectors. 

Rinnai is committed to decarbonisation. Rinnai’s water heating products are all hydrogen-blends ready NOW including the world’s first 100% hydrogen powered water heater. Rinnai products also accept BioLPG capable of delivering NetZero carbon emissions. Rinnai offer comprehensive training courses and technical support in all aspects of the water heating industry. More information can be found on Rinnai’s website and its “Help Me Choose” webpage.

For more information on the RINNAI product range visit

4 November 2022


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