How to Maintain Your Tankless Water Heater – Annual Descale Flush


Nothing beats a nice clean cool drink of water. However, if you own a tankless water heater, you’ll want to keep the heat exchanger free of lime and scale.

You should flush it annually. Here are some basic steps. The pump and hoses will cost less than $120.

HINT :: This is much easier than you think!

What you’ll need:

1- submersible pump (about $90 bucks)

1- set of washing machine hose (about $10 – $15 bucks)

1- 5 gallon bucket

4 gallons of White Vinegar ($2 – $3 bucks per gal)

Follow these steps:

1 Check to see that you have a flush kit installed. If not, the valves will need to be installed. NEED A PLUMBER?

2 Start by turning off the gas (if your heater is gas).

3 Make sure the unit is plugged in and is in the ON position.

4 Shut off the hot and cold water.

5 Open the caps on the flush kit. The kit looks like two hose bib hook ups with a small cap installed.

6 Set the pump into the bucket

7 Hook one of the hose from the pump to the red – inlet – side of the water heater flush kit.

8 Hook one of the hose from the heater (blue) and drop into the bucket

9 Open the drain valves on the flush kit

10 Pour vinegar into 5 gallon bucket

11 Plug-in the cord from the pump and allow to run for about an hour

When finished:

1 unplug the pump

2 turn off the drain valve flush kit handle

3 unhook hose and replace cap on the flush kit

4 turn the water and gas to the on position.


If you have difficulty with any step call a professional plumbing contractor or contact us for help. 601-454-5559

Home Inspector – Home Builder and Building Consultant/Coach

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