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How do I change the water filter on a Noritz N-069M tankless water heater?

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  • james281 Jul 20, 2010

    Need specific procedures on how to replace water filter so as not to damage the system.

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The filter is located on the water inlet to the heater, it's a reuseable filter.
I've listed the steps to remove it and how to clean it.
Allow the water to cool before removing the filter to avoid scalding.

1. Close the water supply valve.
2. Open all hot water fixtures.
3. With a bucket ready, remove the inlet and outlet
drain plugs (about 0.2 gal. will drain out)
4. Take the water drain valve (with water filter) out
of the inlet.
5. Clean the water drain valve (with water filter) with
a brush under running water.
6. Replace the water drain valve (with water filter)
and close the drain plugs.
(Take care not to lose the O ring)
7. Close all hot water fixtures.
8. Open the water supply valve and check that
water does not leak from the drain plugs or water
drain valve (with water filter).

Posted on Jul 20, 2010

  • Mike Raatz
    Mike Raatz Jul 20, 2010

    There will be no damage to the system if the water is shut off, you can go the extra step of turning off the breaker. The filter is located on the water inlet (looking at the unit, lower right side) it's just below the unit facing 90 degrees from the inlet pipe. It's other function is a drain; there should be another drain plumbed into the outlet pipe (left side) once the water is drained from the unit into a bucket, just remove the filter and clean the screen as discribed on the original instructions. Once the filter is cleaned, install the filter close the drain on the outlet side turn on the water and power and check for leaks.





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Http://noritz.com/u/installation_manual_n_0531s_n_0631s_series.pdf
Page 26

Diagram shows exactly where filter is on the end of the water drain valve
Also save the owners manual it will provide alot of useful tips and help on maintaining the water heater.

Posted on Jul 19, 2010

  • james281 Jul 19, 2010

    I need the maintenance manual. I know where the filter is located. I want to know the correct procedure for replacing the filter and descaling the unit.

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