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Limitless Hot Water On Demand For FM Contracts

Limitless Hot Water On Demand For FM Contracts
28 May 2020

Rinnai, makers of continuous flow hot water delivery units that give limitless, on-demand supplies of hot water, is offering FM and their end-users an easy-to-choose facility via an online interface.

FMs and end-user can visit the Rinnai website for near-instant assistance on choosing the right products to deliver fuel, energy, and environmentally efficient hot water, reliably and constantly.


“We recognise that every application is unique and that choosing the right product can be a little daunting so we invite FMs and end-users to visit our website and find the ‘Help Me Choose’ facility and we will do everything else from there.”

–Chris Gogg

Associate Director, Rinnai UK


“Help Me Choose”


Chris Goggin, Associate Director at Rinnai UK, says “Whatever the FM or end-user application we have innovative products and systems that give your site or sites limitless supplies of temperature-controlled hot water which are designed with the environment in mind, with low emission technology and high efficiencies, as well as a host of other great features, as well as costing you significantly less than any other mode of hot water. We will offer full lifecycle costing analysis and carbon footprint modelling to demonstrate the full impact of continuous flow technology.

“We recognise that every application is unique and that choosing the right product can be a little daunting so we invite FMs and end-users to visit our website and find the “Help Me Choose” facility and we will do everything else from there,” adds Mr Goggin.


Installation case study


Rinnai recently completed one installation, after conducting a thorough site survey including a full report to all parties. The report analysed life cycle costings and carbon footprint of the existing system and projected both capital and operational expenditure benefits on using a continuous flow system. 

The existing system was a heated stored water system, this meant that the site was paying to heat water it was not instantly using. It was clear from the site survey that Rinnai units could be configured to maximise both space and energy efficiency, and critically, the system’s reliability, resulting in continuous operational cost savings to the site owners.

Given that the Rinnai units were being wall-mounted and externally flued, this reduced the physical product footprint on the premises as there was no need for a dedicated plant room. For the owners, a manager commented, “The old storage system had become completely impractical, inefficient and needlessly expensive to run.

“Clearly the site needed to change the system to one that could cater for these fluctuations without running up huge energy bills and the solution wasn’t hard to find with continuous flow delivery.

“We presented the project to Rinnai’s Technical Sales team who came up with the design, configured the sizes of unit required and delivered the system complete and to a very tight timescale – this was key as the existing water heater had developed a leak and I was extremely mindful that the business had to remain operational to satisfy local demand.

“The Rinnai system has resulted in an energy reduction and gas-saving due to higher efficiencies and because we are no longer maintaining large amounts of stored hot water.

“In terms of gas usage running costs compared to the old wasteful storage system, our bills have virtually been halved since the Rinnai system went live five months ago which is absolutely tremendous.”


SMART controls to prevent Legionella


Possible Legionella presence is answered by Rinnai: the company 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 at a time when the building is closed. By the time the building reopens, core temperature is 42°C for safe use.


Limescale build-up 


Another Rinnai innovation addresses an age-old industry problem with hot water delivery - limescale build-up. The company’s integrated scale control system is an innovative solution and comes in the form of an LC (lime check) code on the display of the controller. 

Added to this is Rinnai’s electrolytic scale protection system and site managers can enjoy a “fit & forget” solution to any scale issues. Almost all water-fed appliances, including plate heat exchangers, boilers and water heaters will accumulate scale deposits when used within hard water areas over time. Limescale consists of calcium carbonate (calcite) with lesser amounts of other calcium salts such as the sulphate. Sometimes lime scale deposits contain corrosion debris and this scale build-up can affect the water heaters by reducing their efficiency and overall performance. 

Ultimately, ongoing use with hard water may shorten the lifespan of conventional water heating appliances and systems. To safeguard against this Rinnai units continually self-monitor for limescale deposits around the heat exchanger. If a limescale build-up has been identified, a message is sent to the built-in interface panel on the front of the appliance. 

Picture: A photograph of a Rinnai system

Article written by Ella Tansley | Published 28 May 2020


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