Abstract: A portable massager adaptable for foot and wrist applications. An elongated resonator plate is formed from a plurality of contiguous hollow flutes oriented in a longitudinal direction. One or more vibrator cutouts are provided in the resonator plate, passing from its upper side to its lower side. A vibrator, preferably capable of operating from low voltage DC, nests within each cutout. A lower sheet covers the lower side of the resonator plate and lower face of the vibrator. An upper sheet accommodates the upper face of the vibrator and covers at least a portion of the upper side of the resonator plate. Top and bottom vinyl covers encase the massager construction. A vibrator control switch may be included in the power line extending from an external electrical connector to the vibrator. The massager may be powered by a wall transformer or by alternative mobile power sources.

Abstract: A portion of the thermal energy in the hot water in a domestic hot water heater is transferred by a heat exchanger to a fluid, such as FREON 11, in a closed pipe circuit. The temperature-pressure characteristics of the fluid are selected so that as the fluid is heated, it evaporates. In its heated, pressurized, gaseous state the fluid drives a turbine. Upon exhausting from the turbine, the fluid is condensed in a heat exchanger cooled by the cold water supply to the heater. The residual heat in the exhaust gas from the turbine serves to raise the temperature of the cold water entering the heater.