Give us a call on 01928 531 870 Head office or 0203 903 9030 Rinnai London


November 15th, 2017

A new and independent report from AECOM, the biggest global building services consultancy, has shown that Rinnai hot water heating products and systems reduce operational and capital costs when compared with other types of hot water heating systems.

The findings validate and consolidate Rinnai claims that the company supplies the most energy efficient A-rated range of water heaters for inclusion in sustainable total water heating systems on the market today with life cycle costs estimated to be 7% less over 20 years* than the base case example, which included storage.

AECOM had revenues of over $17Billion in 2016 and states that it offers building services ‘expertise across services, markets, and geographies to deliver transformative outcomes. Worldwide, we design, build, finance, operate and manage projects and programs that unlock opportunities, protect our environment and improve people’s lives.’

AECOM conducted study tests in a ‘real-life’ situation in two student accommodation blocks using a base case against which it compared five different options (see Appendix A, below). (Use Appendix A -  capital cost tables)

In the new tests, Task 1 looked at hot water systems for two larger installations with an electric heating system with storage included in the comparison. 


Task 2 looked at how the hot water system affects the overall heating system costs and operational energy and carbon performance. 


The report is based on two student accommodation blocks that share a set of gas boilers providing both space heating and domestic hot water (DHW). The main objective of the report was to compare the baseline system against alternatives such as continuous flow water heaters and air source heat pumps.