Temperature Rise Guide
In short, higher power rated instant water heaters will generate hotter output water temperature compared to lower power rated ones, but will require higher electrical components and wiring specifications to operate safely and optimally.
This visual above displays the temperature rise capabilities between instant water heaters with different power ratings, varied by the water supply temperature and its water flow rate. In summary, an instant water heater’s output water temperature is affected by:
- Power rating | The higher the instant water heater’s power rating, the hotter the output water temperature (but also the higher electrical components’ and wirings’ specifications required).
- Water supply temperature | The lower the original water supply’s temperature, the lower the output water temperature.
- Water flow rate | The higher the water supply’s water flow rate, the lower the output water temperature.
What electrical components' and wirings’ specifications are required for the different instant water heaters’ power ratings?
The table above is taken from the Suruhanjaya Tenaga guideline for water heater installation, which states all the minimum specification requirements for electrical wirings and components (such as switches and MCBs) for instant water heater’s electrical connections.
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