Ill.
Sizing The Hot Water Heater For Installation
IMPORTANT
The following procedures are used to size indirect water heaters based on the amount of
hot water required during a given hour. In doing so, it is assumed that this demand will
be
spread out over the course of the entire hour.
THESE SIZING PROCEDURES ARE PROVIDED AS A GUIDE TO ASSIST THE PROFESSIONAL
CONTRACTOR IN SIZING THE WATER HEATER. BECAUSE OF THE LARGE VARIETY OF
DEMAND SITUATIONS ENCOUNTERED IN THE FIELD, THE MANUFACTURER CANNOT
GUARANTEE THE SUITABILITY OF THESE PROCEDURES TO ALL INSTALLATIONS.
To properly apply the water heater to a particular system, the following 3 steps must be done:
1) Determine the domestic hot water requirements
2) Select the correct water heater/ boiler combination
3) Select a pump, zone piping size, and control system to provide proper water flow from
the boiler through the water heater tank.
This manual presents three methods of sizing this water heater:
Method A: Quick Residential
Method B: Detailed Residential
Method C:
Commercial
Note:
The terms gross output and heating capacity are used interchangeably in this manual. Heating
Capacity is the gross output of boilers of less than 300,000 Btu/Hr input as defined by D.O.E. test
procedures. Gross Output is the term generally used with boilers of greater than or equal to
300,000 Btu/Hr. input.
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