Method A: Quick Residential Sizing Method
Table 4 shows some typical structures under which many single residence applications can be
classified. This procedure will provide satisfactory results most of the time. Where greater accuracy
is desired, use Method B.
1) Find the description that best fits the job and select the Water heater called for. Also, note the
required boiler output under column (F).
2) The Water heater must be installed with a boiler having a gross output (DOE heating capacity)
greater than or equal to that shown in column (F) of Table 4. If the Water heater is to be used with
a boiler having a gross output less than that shown in table 4, use Method B.
If a boiler is to be installed with a water heater, first find a boiler, which will handle the space-
heating load alone. If this boiler has a DOE heating Capacity greater than that shown in column
(F) of table 4, do not add anything to the boiler selected for the Artesian.
If the boiler required for space heating alone has a DOE heating capacity less than that called
for in column (F) of table 4, increase the size of the boiler selected to one with a DOE heating
capacity greater than or equal to that show in column (F).
3) See figures 5-7 for more information on designing a water heater zone system. It is recommended
that the zone be given priority.
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