ELECTRIC WATER HEATER Russian patent published in 1994 - IPC

FIELD: heating of flowing medium. SUBSTANCE: water inlet pipeline 2 and water outlet pipeline 3 are connected to housing 1 whose part is made in form of diaphragm. Housing 1 accommodates electric heater 4 connected to switch 5 coming in contact with diaphragm 6. Mounted on pipeline 3 is valve 8 with through hole 9. Area of flow section of hole is 0.002-0.004 of area of diaphragm 6. At water supply when its flow rate is not below minimum capacity of electric water heater, owing to pressure rise in housing 1, diaphragm 6 acts on switch 5 and the latter switches on electric heater 4. With water supply cut off, electric heater 4 is switched off. EFFECT: enhanced reliability of operation. 1 dwg