The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California

Hot Water Suply

With cold water entering the tank at 65° F., 1 kilowatt will heat 4 gallons of water to a temperature of 165° F., 5 gallons to 152° F., 6 gallons to 140° F., 7 gallons to 127° F., 8 gallons to 115° F., and 9 gallons to 103° F. The water connections to and from the heater are conventional, but it should be noted that long, large recirculating mains will account for a considerably increased operating cost. Electric water heaters are available throughout a wide range of sizes. Many public service companies offer a special low rate for water-heating purposes.

Water Heating By Transfer

28. Apparatus for Heating Water by Transfer.—Water heating by transfer from residence heating systems which use steam or hot water is becoming increasingly popular. In Fig. 14 is shown a steam heating boiler a in which is inserted a copper- or brass-tube manifold b through which the domestic water from the storage tank c circulates by way of the pipes d and e, as shown by the arrows. Cold water is supplied to the tank through a pipe f. The temperature of the heated water is indicated by the thermometer g. The circulating return pipe h conducts hot water from the end of the hot-water main into the pipe d. The manifold b may be above the heating-boiler water line or below it, depending on the volume of hot water desired. An electrically operated centrifugal pump may be inserted in pipe d as a booster to insure rapid circulation and distribution of the hot water, though in many small installations this is not required. The operation of this booster pump may be controlled by an aquastat or water-insertion thermostat in the head of the storage tank.

29. Another device for heating water by transfer is illustrated in Fig. 15. The device, shown at a, is placed alongside the house heating boiler b, which may be for either steam or hot water. . The boiler shown in the illustration is a sectional steam boiler, with connections from every section to a header c, which carries the water of the house heating system into the body of the transfer heater a. Here it circulates around the outside of a copper coil d and having given off a portion of its heat returns to the boiler through the pipe .