Abstract: An improved in-line tankless electrical resistance water heater includes removable brass bottom and top flanges to form an internal chamber in a tubular body. The top brass flange has a cold water inlet and a hot water outlet for connection to a hot water line. The water heater includes an internal passageway through which cold water travels into a flow sensing/heat element activating device and then into the internal chamber. An enlarged double-coiled heating element passes through the bottom flange and a bracket holds sealing elements firmly against connecting ends of the heating element to seal the connecting ends and firmly hold the heating element in place.

Abstract: A compact “in-line” tankless double element water heater includes a top connected to a manifold having a cold water inlet and a hot water outlet for connection to the cold, and hot water lines of a faucet. The compact water heater includes a body with a passageway through which cold water travels, from the top towards the bottom, where it is fed into four separate chambers, two each separated on opposed sides of the body and of a diaphragm. A first of the two chambers on each side has no outlet, and the pressure of cold water therein presses against a first side of the respective diaphragm, while the second of the two chambers on each side includes an outlet to a separate hot water chamber on each side, having a separate heating element therein. A second of the two chambers on each side also includes a plunger, biased by a spring against a second side of the diaphragm, and a plunger rod, which contacts an operating member of a microswitch.

Abstract: An improved “in-line” tankless electrical resistance water heater includes a top having a cold water inlet and a hot water outlet for connection to the cold, and hot water lines of a faucet in a sink. The water heater includes a body with a passageway through which cold water travels, from the top towards the bottom, where it is fed into two separate chambers on opposed sides of a diaphragm. A first of the two chambers has no outlet, and the pressure of cold water therein presses against a first side of the diaphragm, while the second chamber includes an outlet to a further chamber having a heating element therein. The second chamber also includes a plunger, biased by a spring against a second side of diaphragm, and a plunger rod, which contacts an operating member of a microswitch.