I show you the process and materials needed to flush/descale a Rheem/Richmond tankless water heater. These instruction should work for most other brands of tankless water heaters as well.
If you are having any issues with performing my steps on your water heater or are unsure if you are actually cleaning the heat exchanger, check out my follow-up video: https://youtu.be/CfC-WXNDnHo
Product Links:
Watts Tankless Water Heater Service Valve Kit: https://amzn.to/3I5h5U7
The Everbilt pump I used: https://amzn.to/3S1veq8