Installation / Operation Instruction Manual

10
Specifications continued-
Table 5: Water Heater Performance
MODEL
Hot Water
Availability
(Minutes)
Coil Heat
Transfer
Area (Sq Ft)
Pressure Drop
(Feet of Head)
40-Gal.
7.3
7.6
6.0 @ 8 gpm
52-Gal.
9.7
10.0
6.2 @ 8 gpm
75-Gal.
14.3
10.0
6.2 @ 8 gpm
120-Gal
23.8
21.3
8.5 @ 11 gpm
NOTICE
If the boiler takes longer to heat up from a cold start
than the water availability as noted above, hot water
shortage may occur.
Hot water availability is based on drawing 80% of the
heated tank volume at 4 gallons per minute flow rate.
The maximum heat transfer through the coil (heat
input) of the water heater at 240°F boiler water supply
temperature and 210°F potable water temperature is
below 77,500 Btu/hr for the 40, 52 and 75 gallon single
heat exchanger models. Heat transfer is below 139,500
Btu/hr for the 120 gallon models. Potable water
temperature is limited to below 210°F and nominal
water-containing capacity is below 120 gallons for all
indirect-fired models.
Accordingly, per Part HLW-101.2, Section IV of the
ASME Boiler and Pressure Vessel Code, all indirect-
fired products listed are exempted from compliance
with the code.