GB367181A - Improvements in or relating to electric water heaters - Google Patents

Abstract

367,181. Supply and delivery arrangements for hot-water boilers. PETRIE, D. G., 40, Guessens Court, and YOUNG, OSMOND, & YOUNG, Ltd., Unity Works, both in Welwyn Garden City, Hertfordshire. Feb. 21, 1931, No. 5525. [Class 64 (i).] In electric water heaters in which cold water admitted through an inlet 28 to a tank 17 with a heating element 18 displaces hot water through an outlet 22 provided with a syphon fitting 26 which lowers the water level sufficiently when the cold water ceases to enter to prevent dripping down the outlet 22 owing to expansion of the water during heating, an independent air passage structurally associated with the outlet, and formed for instance by a tube 23 concentric with the outlet 22, admits air to the upper portion of the tank during the syphoning action. To prevent water passing down the air passage in case of an excessive rush of water into the tank, the air outlet 25 projects into a space 35 on top of the tank 7, and bears a diaphragm 33 which seals the space 35 when the water rises. The air outlet may alternatively be provided with a valve controlled by a float in the tank or a non-return valve for the same purpose. The electric heating element 18 and the outlet 22 are mounted on a plate 19 secured between a screw threaded ferrule 20 attached to the tank 17 and a screw threaded collar 21 engaging with the ferrule. The tank 17 is carried by members 5, 6 secured to bars 2, 3 which bear the outer casing 1 of the heater. The bars 2, 3 are provided with slots 4 so that they may be screwed to a wall or other fixture.