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ENGLISH
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Gas
supply
Hot water line
Inline
pump
In-line
filter
V1
V2
V4
V3
H
1
H
3
H
2
1
2
3
4
5
6
7
8
Close shutoff valves V3 and V4 on both the hot
water and cold water lines.
Connect hose H1 from the pump outlet to cold
water line V2 into the heater.
Connect drain hose H2 from hot water outlet
line V1 and route into five gallon recirculation
container.
Pour approximately four (4) gallons of virgin
food grade white vinegar or citric acid into the
container.
Place pump suction hose H2 into the cleaning
solution.
Open service valves V1 and V2.
Operate the pump. Circulate the cleaning solution
through the water heater for at least 45 minutes.
Turn off the pump.
Purging the Pressure Relief Valve
If a pressure relief valve discharges periodically, this may be due to thermal expansion occurring in a water
supply system in a closed circuit. Contact the water supplier or local plumbing inspector for the best way to solve
this problem. Do not block the pressure relief valve.
Lime Scale Cleaning Procedure
Materials required:
Five gallon container.
Four gallons of virgin food grade white vinegar or virgin food grade citric acid.
Small inline recirculation pump capable of circulating 2 - 4 gpm (8 – 16 l/m).
Set of hoses for connecting recirculation pump to and from the pump and the five gallon container.
Refer to the diagram to complete this procedure:
Disconnect electrical power to the water heater.
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