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INDIRECT FIRED WATER TANK
II
PRODUCT SELECTION / PERFORMANCE
1. The following guidelines 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 mutltiple 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 119˚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 thermostat setting and using a mixing valve to temper the hot water to
the proper temperature. When temperatures greater than 119˚F are required, use a mixing valve at the outlet of
the water heater or anti-scald fittings at point of use.
PERFORMANCE RATINGS
CAPACITY (Gallons)
HEAT EXCHANGER SURFACE AREA SQ.FT.
RECOMM. FLOW RATE GPM (Boiler Water)
PRESSURE DROP FT. HD. (Heat Exchanger)
FIRST HR. RATINGS GPH 90 DEGREE RISE
CONTINUOUS FLOW GPH 90 DEGREE RISE
FIRST HR. RATINGS GPH 70 DEGREE RISE
CONTINUOUS FLOW GPH 70 DEGREE RISE
BOILER SIZE BTU'S REQUIRED
NOTE: ABOVE RATINGS BASED ON BOILER MAINTAINING TEMPERATURE OF 180 DEGREES FAHRENHEIT.
Estimate of Peak Domestic Hot Water Usage
Average Gallons of
Use Hot Water per Usage
20
20
2
4
4
4
14
5
26
32
Times Used During
One Hour
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
x ______________________
Total Peak Hour Demand
HWT-40
HWT-60
40
55
14
14
10
10
2.3
2.3
188
225
160
187
233
277
205
239
120,000
140,000
Times Used During
One Hour
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
x_______________________
=
_______________________
HWT-80
79
26
14
11
295
240
363
308
180,000
3
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