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Rinnai’s New High-Efficiency, Space Saving External Continuous Flow Hot Water Heaters


Rinnai is launching the Infinity E series of externally mounted continuous flow water heaters. Each unit arrives with water ingress protection (IPx5D) and provides a limitless volume of temperature controlled clean hot water, whilst electric, gas and water services are connected.

The gas-fired water heaters are lightweight (18kgs) meaning that there is no need for heavy lifting gear. The continuous flow water heaters are powerful yet diminutive with a max flowrate of 20 litres per min making them an ideal water heating solution where space is limited.

For a brochure on this new range of external water heaters contact the company direct

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The 17e Hydrogen 20% blend ready certified gas-fired water heater is an ideal solution for glamping sites, leisure facilities, festival ablutions, small commercial outlets and where a requirement for cost effective and durable appliances is needed. The inclusion of micro-processors enables the customer to pre-set water temperature that is delivered accurate to +1 / -1 degree of the set point helping eradicate legionella proliferation and delivery temperature inaccuracies that can create discomfort or scalding. These features have ensured that Rinnai external continuous flow water heaters are used widely in equine and leisure industries.

Rinnai continues to introduce innovative technological solutions to hot water and heating provision in domestic and commercial applications. One such innovation is inherent within E series as the gas-fired water heaters are fitted with micro-processors that will measure incoming water temperatures and modulate gas input. This guarantees the system will only use the required amount of energy to increase water temperature whilst supplying litre upon litre of clean hot water.

Rinnai’s Infinity E Series features an internal monitor that regulates hot water temperature. If any fluctuations rise above 3 degrees of the maximum set temperature, operation of the system will immediately stop ensuring customer safety and low operational costs.

Additional features that are included when purchasing the Rinnai Infinity E Series are as follows:

  • Compact size saving wall and floor space (dimensions length 531x 270x 191)
  • Lightweight 18kgs (no need for heavy lifting gear)
  • Hot Water Delivery Capacity max flowrate 20l/min
  • Temperature Accuracy -1 / +1 from the appliance setpoint
  • Direct force exhaust
  • Temperature Range 37-65°C
  • Ignition Method Direct electronic
  • IPx5D rated.
  • Gross Efficiency 93%
  • Net Efficiency 103%

Rinnai understands the UK customer requirement for cost effective and robust appliances that consistently deliver clean hot water and heating to domestic and commercial buildings across the UK. Rinnai are committed to offering UK customers with low cost and practical solutions that cover all energy options. 

Rinnai offers clear pathways to lower carbon and decarbonisation plus customer cost
reductions for commercial, domestic and off-grid heating & hot water delivery

H3 Hot Water Delivery

Rinnai’s range of decarbonising products - H1/H2/H3 - consists of hot water heating units in gas/BioLPG/DME, hydrogen ready units, electric instantaneous hot water heaters, electric storage cylinders and buffer vessels, a comprehensive range of heat pumps, solar, hydrogen-ready or natural gas  in any configuration of hybrid formats for either residential or commercial applications. Rinnai’s H1/2/3 range of products and systems offer contractors, consultants and end users a range of efficient, robust and affordable low carbon/decarbonising appliances which create practical, economic and technically feasible solutions. 

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

Rinnai products 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.

Rinnai offer carbon and cost comparison services that will calculate financial and carbon savings made when investing in a Rinnai system. Rinnai also provide a system design service that will suggest an appropriate system for the property in question.

Rinnai offer comprehensive training courses and technical support in all aspects of the water heating industry including detailed CPD’s.

The Rinnai range covers all forms of fuels and appliances currently available - electric, gas, hydrogen, BioLPG, DME solar thermal, low GWP heat pumps and electric water heaters More information can be found on Rinnai’s website and its “Help Me Choose” webpage

Rinnai full product availability 24/7 for next day delivery of
all hot water heating unit models including 48-58KW units




REDUCTION of opex cost



REDUCTION of initial cost



REDUCTION in carbon



REDUCTION of space