Water Heater Guidelines and Worksheet
If more than one water heater is proposed for the facility, please identify the units and connections. All approved plans are stamped with the Minimum Requirements for tank style gas, tank style electric, and instantaneous water heater units.
Sizing Requirements for Storage Water Heaters
Note: these sizing requirements do not apply to instantaneous, or on-demand, 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 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 |
Instantaneous, or On-demand, Water Heater Sizing Requirements
Instantaneous water heaters must be sized to provide hot water at a 60 degree rise at 120°F and at a rate of at least 2 GPM to each sink. Hand sinks must receive at least ½ GPM.
NSF listings are used to determine the minimum GPM hot water demand for commercial dishwashers. Refer to the instantaneous water heater unit manual to verify sizing.
For additional information on sizing and installation of water heaters, see Guidelines for Sizing Water Heaters.