How to Clean a Tankless Water Heater

Over time, tankless water heaters are able to accumulate minerals which can build upon and erode the walls of the heating chamber of your tank. In order to maintain properly as well as clean a tankless water heater, you have to flush and remove the mineral deposits from the tank once a year at least. Therefore, just continue reading to learn how to clean a tankless water heater so as to ensure its optimal efficiency and performance.

How to clean a tankless water heater

Turn off the power source for the tankless water heater

Actually, this can totally be done by turning off the circuit breaker for electrical devices or shutting off the main gas.

Turn off the power source for the tankless water heater

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Close and turn off the 3 water valves which are attached to the tankless water heater

– This procedure will help prevent cold water from flowing into your water heater. Also, this way, you can prevent hot water from coming out during the cleaning process.

– The water valves consist of a hot water valve which may be colored red, a cold-water valve that may be colored blue, and a third main valve running the water into your home.

Slowly remove the purge port valve caps from the purge valves located on each of the hot and cold-water valves

– The purge valves have small handles that look like the letter “T.”

– This procedure is to relieve any pressure which has built inside the valves. Therefore, you can prevent excess hot water from shooting out as well as coming into contacting with your skin.

– Remember that there may be pressure while removing the purge port valve caps. That is why it is very important for you to make sure that the hot water is completely and accurately shut off for safety purposes.

– Carefully handle each cap so that the rubber washer sealing discs can stay in place. In fact, this is necessary for your valves to function in a proper way.

Try to attach your hose lines to all the 3 valves

Try to attach your hose lines to all the 3 valves

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– In case the manufacturer of your tankless water heater does not provide you with hose lines, then you need to purchase them. Actually, you can purchase the hose lines from some retail store specializing in water heaters or home repair. Remember that the hose lines must be long enough to reach between your bucket and the water heater.

– You might need to consult your manual provided by the manufacturer of your tankless water heater or directly contact the manufacturer for exact instructions related to this procedure.

– Additionally, in some cases, this procedure requires you to use a sump pump and then connect hoses which will discharge and flush water from your tankless water heater using the hot and cold water valves.

Open the purge port valves

In order to do this, just twist the valves perpendicularly to the position of the hot and cold valves.

Use 9.46 liters (2.5 gallons) of undiluted white vinegar and clean a tankless water heater all the time instead of chemical solutions.

– Keep in mind that your tankless water heater is most likely the source of all the bathing water and more importantly, drinking water. Therefore, using chemical cleaning solutions can be extremely harmful to your health.

– Perform the draining and flushing procedure following the directions which the manufacturer of your tankless water heater provides.

– Overall, this procedure can take up to about 45 minutes to 1 hour.

Twist the “T”- shaped handles after the flushing process has been finished in order to close the purge valves.

Disconnect and then remove the hose lines from each water valve.

Replace the purge port valve caps onto the purge valves

– Try to tighten the caps firmly and completely without breaking the rubber sealing discs inside the caps.

For exact instructions, just refer to the manufacturer’s manual of the tankless water heater to restart your water heater safely.

– Remember that this procedure might require you to rotate and open the cold and hot water valves. That’s why they are parallel to the position of the main valve leading into the house.

Slowly turn on the hot water tap in your sink in order to allow the air to pass through the pipe.

– Continue to run the water until it steadily runs without air escaping.

– Generally, this procedure may take up to 2 or 3 minutes.

Tips

– Whatever, when it comes to how to clean a tankless water heater, you have to refer to the manufacturer’s manual of your tankless water heater directly. Therefore, you can verify that you have all the equipment as well as supplies needed to drain and flush the heater.

Warnings

– Remember to use caution in case you have used hot water immediately before performing this procedure. This is because the water can be excessively hot while handling the purge port valves.

Things You’ll Need

– Utility pump or sump pump

– 9.46 liters (2.5 gallons) of undiluted white vinegar

– 18.92 liter (5-gallon) bucket

– 3 hosing lines (however, this may vary depending on the manufacturer)

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