Patent ID: 9175853
Filing Date: 2015-11-03
Classification: F23D,F23N,F24H

Abstract:
1. A water heating system comprising: An upright boiler, including a combustion chamber, comprising an enclosed housing including a first plate at its top, and a mesh burner mounted to the first plate, said burner housed inside the combustion chamber; at least one conduit fluidly coupled to the combustion chamber to channel gas into the combustion chamber, wherein the burner causes combustion of gas to produce products of combustion; an oxygen sensor coupled to a top plate of the combustion chamber and positioned within the combustion chamber to detect an amount of oxygen in the products of combustion, wherein the oxygen sensor outputs data representative of the amount of oxygen in the products of combustion; a control unit for feedback control of the water heating system, wherein the control unit receives the data from the oxygen sensor and wherein the combustion of the gas in the combustion chamber is controllable by the control unit based on the data; a heat exchanger system coupled to the combustion chamber to heat water in the heat exchanger system with the products of combustion, the heat exchanger system positioned below the combustion chamber and comprising a plurality of substantially straight vertical tubes through which the products of combustion flow; at least one flue coupled to the heat exchanger system to channel the products of combustion out of the heat exchanger system; wherein the top plate is mounted to and positioned on the first plate; wherein the top plate and the first plate define a recess, a surface of the recess within said combustion chamber defined by the first plate, the oxygen sensor positioned with the recess and a sensing element of the oxygen sensor is entirely within the recess.