Descaling The Heat Exchanger
Procedure
1. Disconnect electrical supply from the water heater.
2. Shut off the water supply to the water heater using (installer
supplied) isolation valve.
3. Open hot water taps to drain and relieve pressure from the
plumbing system.
4. Drain water from the unit’s heat exchanger by disconnecting
inlet and outlet water connections.
5. Connect the line (A) from the outlet of the circulating pump
(installer supplied) to the inlet water fitting on the water
heater.
6. Using another line (B), connect to the water outlet fitting
on the water heater. Route the other end of this line into a
descaling reservoir.
7. Using a 3rd line (C) from the descaling reservoir, connect to the
inlet side of circulating pump. Verify there is a filter on the end
of the line in the descaling reservoir.
8. Make sure all connections are “hand tight.”
9. Fill tank with descaling solution so lines inside are submersed.
We recommend a straight white vinegar solution. If using a
commercial descalant, refer to manufacturer’s instructions on
dilution with water.
11. Operate the circulating pump.
12. Make sure there are no leaks and the solution is flowing
from the descaling reservoir through the heat exchanger and
returning to the reservoir.
13. Run solution through the heat exchanger until the solution
returning to the descaling reservoir comes out clear. (Changing
to a fresh solution may be necessary during this process)
14. Disconnect all lines and drain all solution from heat exchanger.
Properly discard solution.
Scale, lime and rust buildup decreases the efficiency of tankless water heaters and other appliances. Buildup can restrict flow and ultimately shut down a unit. Flow-Aide System Descaler quickly dissolves water scale, lime, rust, and other water formed deposits, restoring efficiency to most all appliances. Flow-Aide System Descaler is a non-acid, non-toxic concentrate which is certified to NSF/ANSI 60 for use as a cleaner in potable water systems.
Safely remove scale, lime and rust from Tankless Water Heaters, Hydronic Boilers, Tank Water Heaters and more with Flow-Aide System Descaler
Flow-Aide System Descaler Kit Contains:
- 1 - 3.5 Gallon Bucket
- 1 - 350 GPH Pump
- 2 - 5 Foot Rubber Hoses
- 1 - Quart Flow-Aide
