Dunkirk H2OST Stainless Steel Storage Tanks - Manual (Page 8)

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VI. Maintenance
The water heater is intended to provide many years of reliable service. Components, such as thermostats and relief
valves, may be subject to failures that require service. Depending on the quality of the water supply, sediment and/or
scale may coat the heating coil in the tank and reduce hot water recovery rate. Failure to use the correct procedures or
parts can result in unsafe operation.
The owner should arrange to have the following inspections and simple maintenance procedures done at the suggested
frequencies.
1. Boiler and Domestic Water Piping (Annual)
Check all piping for signs of leakage at the joints, unions and shut-off valves. Repair as required.
2. Temperature and Pressure Relief Valve (Annual)
3. Sediment (Annual except where harsh water quality may require more frequent service)
Depending on water conditions, a varying amount of sediment may collect in the tank. Levels requiring service
are indicated by a small temperature difference between the boiler supply and return lines, and a reduced
recovery rate. Repeated flushing usually clears such material. As a preventive measure, water should be drawn
from the drain valve until it runs clear and the installation of a water filter should be considered.
4. Scale (Annual)
Hard water may cause scale buildup on the outside of the heating coil inside the tank. A water softener will
prevent this problem. Symptoms are identical to sediment buildup. If repeated flushing does not resolve the
problem, chemical cleaning may be required. Contact a qualified contractor.