lp-770 Rev. 000 Rel. 000 Date 6.21.21
7
C. Product Selection - Performance and Sizing Guidelines
1. The following guidelines apply to residential systems only. For commercial or institutional installations contact the factory directly for
assistance.
2. Determine the quanity of domestic hot water required. Factors to consider:
a. Estimate typical peak hour demand. Determine the general time of day (morning, noon, evening) when the most hot water is used.
Use chart below to determine potential maximum usage.
NOTE: The table below describes the minimum BTU/H required to achieve the listed rst hour rating. The mass of the boiler will aect recovery
time. More boiler mass equals longer recovery time.
b. Estimate unusual peak draw demand. Whirlpool baths, hot tubs, and multiple head showers require large quantities of hot water in a
short period of time. Contact xture manufacturer for quantity of water required. Generally speaking, these circumstances can only be
met with larger storage volumes.
c. Domestic Water Temperature - Most residential usage will be satised with 119
o
F water, the temperature setting recommended by the
Consumer Product Safety Commission. Some applications such as laundry and dishwashers may require a higher temperature.
Ratings can be improved by increasing the thermostat setting and using a mixing valve to temper the hot water to the proper
temperature. When temperatures greater than 119
o
F are required, use a mixing valve at the outlet of the water heater or anti-scald
ttings at points of use.
Estimate of Peak Domestic Hot Water Usage
Use Average Gallons of Hot Water per Usage Times Used During One Hour Peak Hour Demand
Shower 20 X =
Bath 20 X =
Shaving 2 X =
Hands and Face Washing 4 X =
Hair Shampoo 4 X =
Hand Dish Washing 4 X =
Automatic Dish Washing 14 X =
Food Preparation 5 X =
Wringer Clothes Washer 26 X =
Automatic Clothes Washer 32 X =
Total Peak Hour Demand =
Table 3 - Water Heater Performance and Sizing Guidelines
Model Units 20 32 40 50
Tank Capacity Gallons 21.2 31.7 42.3 52.9
Minimum Recommended Power BTU/Hr 75,000 95,000 115,000 140,000
Maximum Working Pressure PSI 150
Maximum Temperature
o
F 200
Weight (Empty)
Pounds
74.8 99 112.2 136.4
Weight (Full) 251.4 363.1 464.6 577
D. Anode Rod
This water heater is equipped with magnesium anode rods. Anode rods are sacricial components that counteract water chemistry to minimize
or eliminate tank corrosion.
The anode rods should be inspected at least annually and replaced as necessary to prolong tank life. Have the supply water quality professionally
analyzed, as local water conditions will inuence the duration for inspection and replacement of the anode rod.
Some installation conditions necessitate more frequent inspection of the anode rods. The use of a water softener may increase the speed of
anode consumption. For example, more frequent inspection of the anode is needed when using softened or treated water.
Water with high sulfate and/or mineral content can produce a rotten egg odor in heated water. Chlorinating the water supply may minimize
this problem.
NOTE: Failure of a heat exchanger due to lime scale build-up on the heating surface, low pH, or other imbalance IS NOT covered by the
warranty.
NOTE: Do not remove anode rods from an operating water heater. Operating the water heater without anode rods will shorten the life of the
tank and VOID the warranty.
NOTE: If anode rods are rapidly consumed water chemistry should be tested by a qualied technician. Corrective action should be taken to
prevent the premature failure of the water heating system. Operating the water heater with fully consumed anode rods will shorten the life of
the tank and VOID the warranty.
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