Slant/Fin HWT-120 User Manual
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INDIRECT FIRED WATER TANK
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.
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.
Estimate of Peak Domestic Hot Water Usage
Shower
20
x ______________________
=
x_______________________
Bath
20
x ______________________
=
x_______________________
Shaving
2
x ______________________
=
x_______________________
Hands and Face Washing
4
x ______________________
=
x_______________________
Hair Shampoo
4
x ______________________
=
x_______________________
Hand Dish Washing
4
x ______________________
=
x_______________________
Automatic Dish Washing
14
x ______________________
=
x_______________________
Food Preparation
5
x ______________________
=
x_______________________
Wringer Clothes Washer
26
x ______________________
=
x_______________________
Automatic Clothes Washer
32
x ______________________
=
x_______________________
Total Peak Hour Demand
=
_______________________
Average Gallons of
Use Hot Water per Usage
Use
Times Used During
One Hour
Times Used During
One Hour
HWT-40
HWT-60
HWT-80
HWT-120
CAPACITY (Gallons)
40
55
79
119
HEAT EXCHANGER SURFACE AREA SQ.FT.
14
14
26
26
RECOMM. FLOW RATE GPM (Boiler Water)
10
10
14
14
PRESSURE DROP FT. HD. (Heat Exchanger)
2.3
2.3
11
11
FIRST HR. RATINGS GPH 90 DEGREE RISE
188
225
295
376
CONTINUOUS FLOW GPH 90 DEGREE RISE
160
187
240
293
FIRST HR. RATINGS GPH 70 DEGREE RISE
233
277
363
460
CONTINUOUS FLOW GPH 70 DEGREE RISE
205
239
308
377
BOILER SIZE BTU'S REQUIRED
120,000
140,000
180,000
220,000
PERFORMANCE RATINGS
NOTE: ABOVE RATINGS BASED ON BOILER MAINTAINING TEMPERATURE OF 180 DEGREES FAHRENHEIT.