How to Clean Tankless Water Heater

How to Clean Tankless Water Heater

Tankless water heaters are a very good investment, they provide endless hot water and save energy costs. They also last longer when maintained properly by keeping scale from forming on the elements. Follow these steps to minimize the sediment build up in your tankless water heater:

1) Drain a minimum of 12 gallons of water from the tank before beginning, this will help prevent thermal shock when the tank is drained for cleaning.

2) Turn off all water supplies to the unit. For resistance-type units turn power OFF at the circuit breaker or fuse panel, gas units turn SWITCH to OFF position at the main gas valve.

3) Disconnect the electrical power cord from the receptacle. If you have a gas unit, turn off the main gas valve.

4) Place a bucket beneath the discharge drain on the tankless water heater to catch the water.

5) Open the pressure relief valve to release any built-up pressure (be cautious as hot water will spray out).

6) Close the cold water inlet valve at the tankless water heater (a closed ball valve such as a 3/4″ gate valve is best, but a standard twist type valve plug will work), then open up the hot water side of the unit and allow it to drain. If your tankless has a fibreglass insulation jacket you will need to remove this to expose the element connections or gain access to the drain valve.

7) Inspect the element connections and clean if necessary (do not use any type of abrasive cleaner).

8) Clean the interior of the tankless water heater with a non-abrasive cleaner (such as vinegar or a commercially available descaling product). If a scale is present, allow the cleaner to sit for a few minutes before rinsing with clean water.

9) Inspect the pressure relief valve and replace it if necessary.

10) Reconnect the electrical power cord to the receptacle, turn on gas (if applicable), and open the cold water inlet valve.

11) Check for any leaks and repair as necessary.

12) Turn on the hot water and allow it to run for a few minutes to flush out the lines.

13) Check the water heater temperature and adjust as necessary (see your owner’s manual for instructions).

14) Repeat this process every 6 months to keep your tankless water heater in good working order.

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