R432-12-21. Plumbing and Hot Water Systems

(1) Water supply systems shall be designed to supply water at sufficient pressure to operate all fixtures and equipment during maximum demand periods.

(2) Water distribution systems shall be arranged to provide for continuous hot water at each hot water outlet.

(3) Hot water provided to resident tubs, showers, whirlpools, and handwashing facilities shall be regulated by thermostatically controlled automatic-mixing valves at appropriate temperatures for comfortable use within a range of 105 to 115 degrees F. These valves may be installed on the recirculating system or on individual inlets to appliances.

(4) As a minimum, water heating systems shall provide capacity at temperatures and amounts indicated in Table 3, Hot Water Use. Water temperature is taken at the point of use or inlet to the equipment.

TABLE 3

HOT WATER USE

                           Clinical Dietary(1) Laundry

Gallons per Hour per Bed(a) 3 2 2

Temperature (C)(b) 43 49 71(b)

Temperature (F)(b) 105 120 160(b)

     (1) Provisions shall be made to provide 180 degree F (82 degree C) rinse water at warewasher (may be by separate booster).

     (a) Quantities indicated for design demand of hot water are for general reference minimums and may not substitute for accepted engineering design procedures using actual number and types of fixtures to be installed. Design shall also be affected by temperatures of cold water used for mixing, length of run and insulation relative to heat loss, etc.

     (b) Provisions shall be made to provide 160 degree F (71 degree C) hot water at the laundry equipment when needed.