US 12,422,148 B1
Water heater system
William D. Chandler, Jr., Ashland, OH (US)
Filed by Chandler Systems, Inc., Ashland, OH (US)
Filed on Nov. 9, 2021, as Appl. No. 17/522,472.
Claims priority of provisional application 63/115,644, filed on Nov. 19, 2020.
Int. Cl. F24D 17/00 (2022.01); F24H 15/31 (2022.01)
CPC F24D 17/0036 (2013.01) [F24H 15/31 (2022.01); F24D 2200/32 (2013.01)] 27 Claims
OG exemplary drawing
 
1. Apparatus comprising:
an on demand water heater including:
at least one electrical heating element,
a heat exchanger,
wherein the heat exchanger includes a heat exchanger water inlet and a heat exchanger water outlet,
wherein the at least one electrical heating element is in thermal connection with the heat exchanger intermediate of the heat exchanger water inlet and the heat exchanger water outlet,
wherein the heat exchanger water inlet is configured to be fluidly connected to a water source, and the heat exchanger water outlet is configured to be fluidly connected to at least one water use device,
a water inlet temperature sensor,
wherein the water inlet temperature sensor is operative to sense an inlet water temperature corresponding to temperature of water entering the heat exchanger water inlet,
a water outlet temperature sensor,
wherein the water outlet temperature sensor is operative to sense an outlet water temperature corresponding to temperature of water exiting from the heat exchanger water outlet,
a flowmeter,
wherein the flowmeter is operative to sense a water flow rate corresponding to rate of water flow passing through the heat exchanger from the water inlet to the water outlet,
a house current electrical connector,
wherein the house current electrical connector is configured to electrically connect to a source of house current electrical power, which source is limited to supplying house current electrical power at below a set power level,
a rechargeable battery pack,
at least one circuit, wherein the at least one circuit is in operative connection with
at least one data store, wherein the at least one data store includes data corresponding to a set hot water delivery temperature,
the at least one electrical heating element,
the water inlet temperature sensor,
the water outlet temperature sensor,
the flowmeter,
the rechargeable battery pack,
the house current electrical connector,
wherein the at least one circuit is operative to cause
responsive at least in part to the water flow rate sensed by the flowmeter and the inlet water temperature sensed by the water inlet temperature sensor, electrical power to be delivered from the rechargeable battery pack to the at least one electrical heating element at a battery pack power delivery rate to cause the water outlet temperature to be at about the set hot water delivery temperature,
wherein the battery pack power delivery rate is at least twice the set power level,
the rechargeable battery pack to receive electrical power delivered through the house current electrical connector, wherein the electrical power delivered through the house current electrical connector is operative to charge the rechargeable battery pack.