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II Product Selection
II
PRODUCT SELECTION/
PERFORMANCE
1. The following g u ide line s apply to residential systems only. For commercial or institutional installations contact
the factory directly for assistance.
2. Determine the quantity 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.
Use
Shower
Bath
Shaving
Hands and Face Washing
Hair Shampoo
Hand Dish Washing
Automatic Dish Washing
Food Preparation
Wringer Clothes Washer
Automatic Clothes Washer
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 fixture 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 satisfied with 119ºF water, the temperature
setting recommended by the Consumer Product Safety Commission. Some applications s u c h as laundry and
dishwashers may require a higher temperature.
Ratings can be improved by increasing Techtanium thermostat setting and using a mixing valve to temper the
hot water to the proper temperature. When temperatures greater than 119ºF are required, use a mixing valve at
the outlet of the water heater or anti-scald fittings at point of use.
III Specifications and Performance
MP Model
Tank Capacity
Minimum Recommend Power
Maximum Working Pressure
Maximum Temperature
Weight (empty)
Weight (full)
Estimate of Peak Domestic Hot Water Usage
Average Gallons of
Hot Water per Usage
20
20
2
4
4
4
14
5
26
32
Units
Gallons
Btu/Hr.
P.S.I.
Degrees F
Pounds
Pounds
Times Used During
One Hour
x
x
x
x
x
x
x
x
x
x
Total Peak Hour Demand =
20
21.2
75,000
95,000
150
194
74.8
251.4
3
Times Used During
One Hour
=
x
=
x
=
x
=
x
=
x
=
x
=
x
=
x
=
x
=
x
32
40
31.7
42.3
52.9
115,000 140,000
150
150
150
194
194
194
99
112.2
136.4
363.1
464.6
577
50
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