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Calcuating Hot Water Demands

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   HOT WATER DEMANDS   ESTABLISHMENT   DATE  .  ADDRESS  .  Fixtures    No. Units  X GPH =  Total GPH  . . X = .  . . X = .  . . X = .  . X = .  . . X = .  . . X = .  . . X = .  . . X = .  . . X = .  . . X = .  TOTAL GPH  = . COMPUTING THE BTU INPUT ( Gas Water Heaters ): TOTAL GPH x % (See Sizing requirements below) = GPH required. GPH required x 60° rise x 11 = BTU input of water heater. FORMULA FOR ELECTRIC WATER HEATER  : . GPH required x .149 = . KW input. SIZING REQUIREMENTS FOR STORAGE WATER HEATERS See next page for Instantaneous, ie, tankless water heaters Food facilities with multi service eating utensils, heavy use (serving 3 meals a day): 100% GPH required Food facilities with multi service eating utensils, moderate use: 90% GPH required Food facilities with only single- service eating utensils or don’t use utensils at all:  80% GPH required Food facilities that sell only prepackaged foods, a water heater with a minimum storage capacity of 10 gallons must be provided.    HOURLY HOT WATER DEMAND TABLE   Utensil Sinks 18” x 18”   14 Gallons per compartment (base at 10” deep)   24” x 24”  25 Gallons per compartment Custom sink sizes can be calculated using the following formula: Length (ft.) x Width (ft.) x Depth (ft.) x 7.5 = gallons per compartment. Bar Sinks 6 Gallons per compartment Hand Sinks 5 Gallons per sink Pre-rinse Units Hand spray type 45 gallons Other type: Refer to manufacture’s specifications for equipment Clothes Washers   9 and 12 lb washers 45 gallons 16 lb washers 60 gallons Food Preparation Sinks 5 Gallons per sink Employee Shower 20 Gallons per shower Janitorial Sinks and Garbage Can Wash Facilities 15 Gallons per sink or facility Other Fixtures That Use Hot Water Refer to manufa cture’s specifications for the eq uipment or  NSF® listing. INSTANTANEOUS WATER HEATERS:   Instantaneous water heaters must be sized to provide hot water of at least 120°F, and at a rate of at least 2GPM to each sink (hand sinks must receive at least ½ GPM). NSF listings are used to determine the minimum GPM hot water demand for automatic dishwashers.
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