Abstract: A water heating pod includes at least one water heating module packaged within a container. The water heating module includes a plurality of water heating units in fluid communication with a basin. The basin is configured to support a first fluid communication between the water heating units and provide a second fluid isolation between the water heating units.

Abstract: A water heating pod includes at least one water heating module packaged within a container. The water heating module includes a plurality of water heating units in fluid communication with a basin. The basin is configured to support a first fluid communication between the water heating units and provide a second fluid isolation between the water heating units.

Abstract: An application for a method of heating water includes transferring the water from a water supply into an inner tank of the water heater which is held within an outer tank, transferring the water from the inner tank into an outer tank and then to supply a building with hot water. The water in the outer tank is heated with hot gasses, partially cooling to intermediate temperature gasses. The water in the inner tank is heated with the intermediate temperature gasses, further cooling the intermediate temperature gasses into cooler gasses that are then exhausted out of the water heater.

Abstract: An application for a method of heating water includes transferring the water from a water supply into an inner tank of the water heater which is held within an outer tank, transferring the water from the inner tank into an outer tank and then to supply a building with hot water. The water in the outer tank is heated with hot gasses, partially cooling to intermediate temperature gasses. The water in the inner tank is heated with the intermediate temperature gasses, further cooling the intermediate temperature gasses into cooler gasses that are then exhausted out of the water heater.