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Specifications continued-
Table 5: Water Heater Performance
MODEL
40-Gal.
52-Gal.
75-Gal.
120-Gal
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.
Hot Water
Availability
(Minutes)
7.3
9.7
14.3
23.8
NOTICE
11
Coil Heat
Transfer
Area (Sq Ft)
7.6
10.0
10.0
21.3
Pressure Drop
(Feet of Head)
6.0 @ 8 gpm
6.2 @ 8 gpm
6.2 @ 8 gpm
8.5 @ 11 gpm
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