Universal Descaling Method.
Hi, for Descaling any tank less water heater you need these tools,
1. spanner 🔧,
2. Soft water pipes (2 pieces) 3 feet each.
3. Soft disposable Gloves.
4. Small amount of Drain Opener Liquid, we use to clean commode and Sinks. (i.e Harpic, Sweep)
----First of all you have to Close water supply valve to the water heater, and unscrew W.Heater main inlet and outlet Screw,
-----then attach 1 external soft water pipe to outlet connector and 2nd to inlet connector of w.heater.
---Now Put some drain liquid in inlet attached soft pipe,
----for pushing water flow towards w.heater, attaching to any tap and slow release water to pass through the heater, it will clear scale you can repeat 3 or 4 time for best results.
Don't forget to keep outlet pipe in a plastic bag or bin. For safety purposes.
After that leave clean water to pass through heater to remove drain liquid.