10
Specifications continued-
Table 5: Water Heater Performance
MODEL
Hot Water
Availability
(Minutes)
Coil Heat
Transfer Area
(Sq Ft)
Pressure Drop at
Rated Heat
Source Flow Rate
(Feet of Head)
40-Gal. 6.8 14.2
2.4
50-Gal. 8.6 14.2
2.4
65-Gal. 10.8 14.2
2.4
80-Gal. 13.5 14.2
2.4
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
23,500 Btu/hr. 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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