IBC IWT 119, Installation And Operating Manual, Page: 17 / 40

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2.0 Pre-installation overview
Note
Local inspection authorities may not accept the indirect water heater due to jurisdictional
demands such as double-wall heat exchanger requirements, local, or state registration
requirements. Before installing the indirect water heater, you must check that local authorities will
accept this equipment.
2.1 Installation checklist
The following checklist will help with water heater, boiler, and circulator sizing.
Checklist Check
Water heater sizing Choose the water heater model based on the expected water
usage for the given site. The average residence with one
shower or more will require a Model 40 or larger. Factors that
increase water demand dramatically include high flow shower
heads, hot tubs, and the use of more than one shower at a time.
Increase the tank size if these factors are present.
Carefully review the IBC water heater Specifications on page 6 ,
and consult ASHRAE sizing guides and other reliable
references. Dimensions, weights, ratings, and capacities are
outlined in the Specifications tables (see Table 1 and Table 2 ).
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Boiler sizing The water heater will provide the rated performance only if it is
used with a boiler with a heating capacity of at least as much as
the capacity ratings in Table 1 and Table 2 . If the boiler has
less capacity, the water heating output will be reduced.
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Circulator sizing Refer to Table 1 and Table 2 for the flow through the water
heater coil and the pressure drop at minimum flow. Calculate
the pressure drop across all piping and fittings connected to the
water heater zone. Be sure to include all zone valves, check
valves, and shut-off valves. We recommend piping the water
heater zone with minimum 1" pipe around the entire loop on
typical small residential sites.
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