MicroHeat CFEWH hot water service – Replacement for traditional hot water service installations
Storage tank hot water services
Storage tank hot water services lose heat/energy because they are required to maintain water at a temperature significantly higher than typically used by the consumer.
Additionally, the water heater is usually located away from where the hot water is required, either inside (taking up valuable space) or outside (exposed to the elements), relying on lengths of pipe (reticulation) to deliver the hot water to the point of use – with additional heat/energy losses being incurred.
Up to 4kW/hr of the heat/energy can be lost per day from the storage tank and the associated hot water reticulation/location.
Water is also wasted every time hot water is used because the stored volume of cold water in the pipes needs to be “drawn off” before it is replaced by heated water.
By regulation, water stored in tanks must be heated to more than 65°C to prevent the growth of Legionella bacteria. The user is at risk of scalding if water is delivered at this temperature.
To avoid scalding, costly maintenance dependent tempering valves and/or thermostatic mixing valves need to be installed, these are required to maintain outlet water temperatures to fixtures, which are primarily supplied for personal hygiene at or below 50°C (AS 3500).
Water heaters that use heat exchange technology are prone to the build-up of scale deposits on the heat exchanger. This reduces heating efficiency and the operating life of the appliance.
Point of use hot water service solutions, supported by the CFEWH, do not require long lengths of hot water reticulation.
MicroHeat CFEWH hot water service
The CFEWH does not store water in anticipation of use, and is typically installed close to, or at the hot water point of use.
Little, or no heat/energy is lost – standby energy consumption is typically leass than 1W.
Little or no water is wasted because of “draw off” as the CFEWH can be installed at or very close to the hot water point of use.
Less than 1L of water is contained in the CFEWH – thus Legionella is not an issue. Water is not required to be heated to 65°C and is only heated to the temperature used by the consumer.
Scalding is not an issue – water cannot be heated to greater than 50°C – as per AS 3500.
The CFEWH does not use heating elements, rather directly energises the water to be heated in a safe and controlled manner. Thus the negative impact of scaling suffered by other water heaters is not experienced. Heating efficiency is maintained and operating life is not impacted.
The installation of the Continuous Flow Electric Water Heater (CFEWH) as a point of use hot water service offers substantial benefits to the building industry:
In the context of hot water service infrastructure costs and efficiencies, MicroHeat has collaborated with Wood & Grieve, a national construction consulting firm and RMIT, a Melbourne-based University to review and assess these hot water service infrastructure aspects in high and low rise developments.
These reports are available for download
Building applications but not limited to: