11
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.
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