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Frequently asked questions about electric water heaters

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General FAQ

 Instant water heatersStorage water heaters  
HeatingInstantaneous heating to the water flowing through the deviceCold water is stored and heated in a tank over time  
UsageSingle point of use (mainly for bathroom shower)Multiple points of use (shower mixer, kitchen sink faucets, bathroom taps)  
     

Which water heater should I get?

Getting a water heater, but not sure which one is right? Our Bathroom Guide provides information on the various types of water heaters and tips and advice when it comes to choosing the right one for your home.

FAQ on instant water heaters

Check if the water inlet and outlet of your device have been connected correctly, as heating may have been deactivated as a safety feature in Viessmann instant water heaters in the following conditions:

  1. when the water inflow and outflow is detected to be incorrect. (Refer to the label on the underside of the heater unit to identify the heater inlet and outlet.)
  2. when the water flow rate is below 2L/min and/or water pressure is below 0.1bar

If the above conditions have been fulfilled and your water heater is still not working, please contact Viessmann Service Support to check and service on the water heater unit.

FAQ on storage water heaters

Before turning on the electrical supply, turn on the water supply to ensure that your storage water heater is completely filled up with water. This is an important step to avoid dryburn and damage to the thermal components such as thermostat and heating element.

Make sure that the water inlet and outlet have been connected correctly, otherwise colder water in the storage tank will be dispensed first. The red and blue rings on the underside of the Viessmann storage water heater indicate the hot water outlet and cold water inlet respectively.

This image shows the bottom of the Vitowell comfort Classic (cube).
This image shows the bottom of the Vitowell comfort Classic (cube).

If the above conditions have been fulfilled and your water heater is still not working, please contact Viessmann Service Support to check and service on the water heater unit.

Contact Viessmann

How can we help?

Tap on the button below to WhatsApp us at +65 8028 0468 during office hours (Mondays – Fridays, 9am – 6pm), or select Contact Form below to provide us with details of your enquiry. We will get back to you as soon as possible.

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