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7 Simple Steps to Descale a Tankless Water Heater

hot-water rhainai

A real basic thing that most of us homeowners neglect at times is maintaining our tankless water heaters. Tankless water heaters are great and very useful. As a homeowner, it is important for us to know how this specific equipment is used and maintained for it to work for a longer period of time.

If the tankless waters are in a hard water area, they need to be flushed for about 12 to 18 months depending on your usage. So if you are in a family of 2, you might be able to go 18 months before you flush your tankless water heater but if you are a family of 3 or 4 then you might need to flush it about every 12 months because if you don’t you will experience having scales build up in the broiler. The scales in the broiler are going to back up and create a mess in your water heater.

We will provide you a quick step in descaling your tankless water heater. Just prepare the following materials that you will need.

  • 3 gallons of white vinegar
  • Submersible pump
  • Standard 5-gallon bucket
  • Standard hose set
  • Leather man tool

Steps to do:

    1. Before you do the flushing, you need to double check the flush kit installed in your tankless water heater. If you don’t have the two valves for the flush kit in your tankless water heater, you cannot do this operation. The two valves look like a hose bib on the cold and hot side, you need those valves so if you don’t have it you need to call first a plumber and have it installed first before you do any flushing for your tankless water heater.

    2. If you have the flush kit installed in your tankless water heater, the next thing that you need to do is to turn off the gas. Anything you see a valve that is in line that means that it is on, if it is perpendicular it is off. You need to leave the power turn on to the unit so that electricity is still running into the unit.
    Take Note: The two valves in your tankless water heater are usually labelled with blue and red color flag. Blue is for the cold water side going into the tank and the red line is for the hot water from the tank going inside your house.

    3. Turn off the both of the valve so that there will be no cold and hot water running through the valves.

    4. Open the valve a little bit and drain the water remaining in the cold water valve and then next the hot water valve. Get the leather man tool and turn the pre filter for the unit and have it removed and check it before you do the flushing. Once you removed the pre filter unit have it cleaned by water and put it back for the flush.

    5. Pour 3 gallons of white vinegar into the bucket and have the submersible pump sit into the bottom of the bucket. Connect the hose of the submersible pump to the cold side of the valve so that the vinegar will be running first through the pre-filter. Get the standard hose set and have it connected to the hot side of the valve going to the bucket of vinegar. What you are trying to make is a big continuous loop of vinegar going in and out of your tankless water heaters.

    6. Plug the pump to the electric switch and let the system run for about 60 minutes to an hour and a half. What you are doing is just recycling the vinegar in and out of the broiler to get any scale out of it.

    7. After running the vinegar into the system undo the set up and remove the hose connecting to the two valves and open up the valve for the cold and hot side of the valve and turn the gas line back on and everything is set up and ready to use again.

This is a very simple operation and you really need to do this process to maintain the life span of your water heater. A tankless water heater should last for 20-25 years or maybe 30 years if it is just properly used and maintained.