In order to get the most out of your tankless water heater, it is very important to perform routine maintenance on your unit from time to time. Examine the area around the heater for any combustible materials such as paper, or chemicals. Be sure to clear away any such materials you find. Regularly check the exhaust vent and air inlet for any dust, soot or other debris that may have accumulated, restricting the air flow that the device requires. Check the pipes for leaks. Examine the water heater for anything that seems out of the ordinary;any unusual sounds, smell of gas, etc.
Also, keep the water heater clean using a combination of warm water and a mild detergent. Avoid alcohol-, benzene-, oil- or fat-based detergents. We recommend using a clean, lint-free cloth to wipe down the heater's exterior. You may also clean the heater's remote control in a similar fashion. Avoid applying water directly to the heater or its remote control.
Periodically check the water heater's water drain valve and water filter screen in order to avoid any debris from building up. Otherwise, your hot water may not flow properly or will flow at a lower temperature than desired. To do this, turn off the device and allow it to cool.
One of the ongoing maintenance requirements is to make sure that heat exchanger elements are free from any limescale or scale as it is commonly know. Flushing tankless water heaters whose heat exchangers are blocked by the lime scale is very important and must be done before something happens. If you don't flush the water heater, the heat exchanger can be damaged as not enough water will pass through and cool it down.
Visit the link below for addition information regarding routine maintenance on your tankless water heater.