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Maintenance For On Demand Water Heaters

The maintenance of the tankless water heater needs to be done once every 12 to 18 months. This is one of the most important parts of having a tankless water heater. Instant hot water heaters have a tendency to have some scale build up in their boilers due to the constant usage, especially if you live in hard water area. You might be able to push it back to 18 months if you are a 2 people family. If you don’t flush the system, the buildup scale will get sedminted through the boiler and will create a lot bigger problem than it should. It is fairly simple to flush your instant hot water heater.
One of the most important thing to keep in mind when considering flushing of your tankless hot water heater is that if it has tankless service valves, it would be really easy compared to not having the valves. Though you can still do it without the valves, it may turn out to be a mistake if you do not do it correctly. Hence, contact your plumber if you do not have the service valves.
If you do have service valves, here is what you need to know to flush your tankless hot water heater.

Things you need to be able to flush your tankless water heater:
- A submersible water pump
- Standard 5 gallon bucket
- A hose set which could be bought at any big box stores
- A tankless hot water heater
- About 2.5 to 3 gallons of undiluted white vinegar to clean the inside of the tankless hot water heater.

Step 1. First thing first, you need to turn off the gas to the water heater. The line would be located on the side of the water heater system. You need to make sure that the knob is PERPENDICULAR to the pipe. This means that the line is TURNED OFF. You do not need to turn off the electricity supply to the system, though there is no harm in doing so.
Step 2. Close and turn off the water valves connected to your instant hot water heater (tankless hot water heater). What this would do is that it will stop the cold water from entering the system and hot water from coming out. The cold water valve is usually covered with blue, and hence they are the cold water valve. The hot water valve is covered with red. To make sure that the valves are closed, check if the valve switch is perpendicular to the line.
Step 3. Once the valve is closed, remove the valve covering or purge port valve caps. These caps have a small handle that assemble the letter T in most cases. The covers are located on the valves. This is done so as to remove the pressure from the system. Hence once you remove the cover, a little bit of water will come out from each valve. Now sometimes due to pressure it may come out with a higher force than anticipated. There may be pressure when removing the purge port valve caps, so it is extremely important to make sure the hot water valve is completely and accurately shut off for safety purposes. Make sure the rubber washer sealing discs stay in place, which are needed for your valves to function properly.
Step 4. Fill up the bucket with the vinegar. This will be used to pump the vinegar inside the system and cycled back in the bucket.
4. Attach your hosing lines to each of the valve. Connect the water pump line to the cold water valve so as to pump the vinegar solution inside the system. Attach a hose line to the hot water valve and put the other end of the hose inside the vinegar bucket, so as to create a closed loop system.
Step 5. Once everything is in place and you have made sure that the hoses are connected properly, open the valve lines for both cold and hot. Let the water pump do its job for about one to one and a half hour. This will pump the vinegar through the system and make sure to clean everything out nice and easy.
Step 6. Once the cleaning is done, remove the hoses, put the valve cover or purge port valve caps back on. Make sure everything is good and tight. Turn on the water lines and the gas line. You should be good to go. Make sure to refer to the manufacturer's manual.