Notice how the water is pretty clear at this point
We have a pump circulating a cleaner through the tankless water heater
This is what was pulled out of the water heater after 20 minutes of cleaning. This will improve the heat exchange of the system.
This is a tankless water heater that was installed a few years ago by another contractor that never told the customer about cleaning it on a regular basis. We were called to fix a water leak on the system and told the homeowner about the importance of cleaning it.
Here are a few photos from a tankless water heater cleaning. You can see how the cleaning process pulls out impurities that get stuck to the inside of the heat exchanger during normal operation. Venting and fuel lines are also inspected during this process.