Abstract: An electric tankless water heater for heating a continuous supply of water. The electric tankless water heater includes a heater assembly having a water inlet, a water outlet and a heating chamber defining a water flow path there between. A flow sensing device is coupled to the water flow path and configured to detect an ultra-low flow condition of water within a heating chamber of the heater assembly. In response to the detection of an ultra-low flow condition, or higher flow conditions, a controller regulates the amount of electrical current flowing through to achieve the desired temperature of water at the water outlet.

Abstract: A tankless water heater includes a heater assembly, a temperature sensor, a flow sensor, a first heating element, a second heating element, and a controller. The heater assembly includes a water inlet, a water outlet, and a heating chamber defining a water flow path between the water inlet and the water outlet. The temperature sensor measures the temperature of water flowing through the heating chamber. The flow sensor measures a flow condition of water within the heating chamber. The first and second heating elements are located in the heating chamber and include first and second wattages, respectively. The second wattage is different from the first wattage. The controller is coupled to the first and second heating elements and the temperature and flow sensors. The controller is configured to regulate the amount of electrical current flowing through the first and second heating elements in response to the flow condition.

Abstract: A method of operating a tankless water heater for heating a continuous supply of water. The method includes detecting a water flow condition within a heating chamber of the tankless water heater and regulating electrical current to first and second heating elements in response thereto. Both the first and second heating elements are located in the heating chamber, and respectively have first and second wattages, where second wattage is different than the first wattage. The regulating step further includes providing electrical current to the first heating element and not to the second heating element when a first flow condition is detected, and providing electrical current to the second heating element and not the first heating element when a second flow condition is detected, and providing electrical current to both of the heating elements when a third flow condition is detected.

Abstract: An electric tankless water heater for heating a continuous supply of water. The electric tankless water heater includes a heater assembly having a water inlet, a water outlet and a heating chamber defining a water flow path there between. A flow sensing device is coupled to the water flow path and configured to detect an ultra-low flow condition of water within a heating chamber of the heater assembly. In response to the detection of an ultra-low flow condition, or higher flow conditions, a controller regulates the amount of electrical current flowing through to achieve the desired temperature of water at the water outlet.

Abstract: The present disclosure relates to a dual flow fitting that permits a user to select between a first, low flow rate and a second, high flow rate, as well as variable flow rates there between. The fitting includes a plunger within a housing body. A plurality of longitudinal grooves are defined along either the inside of the housing body or the outside of the plunger. At least one of the grooves has a varying portion along which the cross-sectional area of the groove varies over a length of the groove. This varying portion can be moved relative to a seal member positioned between the housing body and the plunger, thus allowing for variation of the flow rate through the fitting. The larger the cross-sectional area of the groove(s) at the point of contact with the seal member, the greater the flow rate through the fitting.

Abstract: A tankless water heater includes a heater assembly, a temperature sensor, a flow sensor, a first heating element, a second heating element, and a controller. The heater assembly includes a water inlet, a water outlet, and a heating chamber defining a water flow path between the water inlet and the water outlet. The temperature sensor measures the temperature of water flowing through the heating chamber. The flow sensor measures a flow condition of water within the heating chamber. The first and second heating elements are located in the heating chamber and include first and second wattages, respectively. The second wattage is different from the first wattage. The controller is coupled to the first and second heating elements and the temperature and flow sensors. The controller is configured to regulate the amount of electrical current flowing through the first and second heating elements in response to the flow condition.

Abstract: The present disclosure relates to a dual flow fitting that permits a user to select between a first, low flow rate and a second, high flow rate, as well as variable flow rates there between. The fitting includes a plunger within a housing body. A plurality of longitudinal grooves are defined along either the inside of the housing body or the outside of the plunger. At least one of the grooves has a varying portion along which the cross-sectional area of the groove varies over a length of the groove. This varying portion can be moved relative to a seal member positioned between the housing body and the plunger, thus allowing for variation of the flow rate through the fitting. The larger the cross-sectional area of the groove(s) at the point of contact with the seal member, the greater the flow rate through the fitting.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 12 gpm; (2) 18 gpm; (3) 20 gpm; and (5) 20 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.

Abstract: In various aspects, the present invention provides an electric tankless liquid heater system capable of delivering liquid, such as, for example, water, with an acceptable increase in output liquid temperature upon a sudden and substantial decrease in liquid demand. In various aspects, the electric tankless liquid heater comprises an inlet manifold and a plurality of liquid heaters the inlets of which are connected in a parallel flow relationship by the inlet manifold, and the outlets of which are each connected to a separate outlet conduit, and which is configured to provide water to a plurality of automatic water fixtures with a less than about 2° F. (about 1.1° C.) increase in output water temperature upon about a one-and-a-half-fold or greater decrease in water demand that occurs in less than about 500 milliseconds as measured by the increase time of the inlet liquid pressure.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 12 gpm; (2) 18 gpm; (3) 20 gpm; and (5) 20 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 12 gpm; (2) 18 gpm; (3) 20 gpm; and (5) 20 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.

Abstract: In various aspects, the present invention provides an electric tankless liquid heater system capable of delivering liquid, such as, for example, water, with an acceptable increase in output liquid temperature upon a sudden and substantial decrease in liquid demand. In various aspects, the electric tankless liquid heater comprises an inlet manifold and a plurality of liquid heaters the inlets of which are connected in a parallel flow relationship by the inlet manifold, and the outlets of which are each connected to a separate outlet conduit, and which is configured to provide water to a plurality of automatic water fixtures with a less than about 2° F. (about 1.1° C.) increase in output water temperature upon about a one-and-a-half-fold or greater decrease in water demand that occurs in less than about 500 milliseconds as measured by the increase time of the inlet liquid pressure.

Abstract: In various aspects, the present invention provides an electric tankless liquid heater system capable of delivering liquid, such as, for example, water, with an acceptable increase in output liquid temperature upon a sudden and substantial decrease in liquid demand. In various aspects, the electric tankless liquid heater comprises an inlet manifold and a plurality of liquid heaters the inlets of which are connected in a parallel flow relationship by the inlet manifold, and the outlets of which are each connected to a separate outlet conduit, and which is configured to provide water to a plurality of automatic water fixtures with a less than about 2° F. (about 1.1° C.) increase in output water temperature upon about a one-and-a-half-fold or greater decrease in water demand that occurs in less than about 500 milliseconds as measured by the increase time of the inlet liquid pressure.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 12 gpm; (2) 18 gpm; (3) 20 gpm; and (5) 20 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 6 gpm; (2) 9 gpm; and (3) 12 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.

Abstract: In various embodiments, the invention provides a system for heating a liquid, such as, for example, water, comprising a plurality of liquid heaters, the inlets and outlets of which are respectively connected in a parallel flow relationship by respective manifolds, and configured to provide liquid having a temperature of greater than about 90 degrees Fahrenheit at a flow rate of greater than about 10 gallons per minute. In various embodiments, the present invention provides an electric tankless liquid heater system capable of delivering hot liquids, and in particular water, at even higher flow rates and or temperatures, including, but not limited to, flow rates greater than about: (1) 12 gpm; (2) 18 gpm; (3) 20 gpm; and (5) 20 gpm; and/or temperatures of greater than about: (1) 100° F.; (2) 120° F.; (3) 140° F.; and (4) 180° F.