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TANKLESS WATER HEATER
Figure 43 – Draining the Water Heater
6. Reinstall the cold water inlet filter.
7.
Restore water service to the water heater by opening the isolation valves, or turning on the main water
valve.
8. Turn on the gas valve. Turn on electrical power to the water heater and press the Power button to turn the
water heater on.
Flushing the Water Heater
Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified
service technician.
NOTE: Improper maintenance WILL VOID water heater warranty.
1. Disconnect electrical power to the water heater.
2. Close the shutoff valves on both hot water outlet and cold water inlet lines (V1 and V2).
See Figure 49.
3. Connect one hose (D1, Figure 49) to the valve (V3) and place the free end in a bucket. Connect one of the
hoses (D3) to the circulation pump outlet and the cold water inlet line to valve V4. Connect the other hose
(D2) to the circulation pump inlet and place the free end in the bucket.
Figure 44 – Flushing the Water Heater
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