초록 ▼

An electric water heater has upper and lower electric resistance type heating elements respectively controlled by a single pole, double throw upper thermostat and a single pole, single throw lower thermostat. The upper and lower thermostats are operatively interconnected by a wiring harness having o

An electric water heater has upper and lower electric resistance type heating elements respectively controlled by a single pole, double throw upper thermostat and a single pole, single throw lower thermostat. The upper and lower thermostats are operatively interconnected by a wiring harness having outer wire end portions that may be connected in various orientations to the terminal block portion of an external junction box to provide the water heater with a variety of heating element operating modes without having to replace either of the thermostats or vary the wiring harness interconnections therebetween. The water heater may thus be advantageously manufactured in a single variant that may be easily and quickly modified in the field to selectively alter the heating element control mode of the water heater.

대표청구항 ▼

[ What is claimed is:] [1.]1. Liquid heating apparatus comprising:a tank adapted to hold a quantity of liquid to be heated;first and second spaced apart electric heating elements extending into the interior of said tank and being operable to heat liquid therein;first and second electric thermostats

[ What is claimed is:] [1.]1. Liquid heating apparatus comprising:a tank adapted to hold a quantity of liquid to be heated;first and second spaced apart electric heating elements extending into the interior of said tank and being operable to heat liquid therein;first and second electric thermostats respectively and controllingly associated with said first and second electric heating elements; andwiring operatively connected to said first and second thermostats and having portions variably connectable to a source of electrical power,said wiring being connected to said first and second thermostats in a manner such that, without replacing either of said first and second thermostats or altering the wiring connections to either of said first and second thermostats, said wiring may be variably connected to a source of electrical power to provide said liquid heating apparatus with a plurality of heating element control modes.