Heat exchanger for heating water

A heat exchanger for heating water, the heat exchanger comprising:

• a non-circular shell at least partially defining an interior region;
• a burner positioned to deliver combustion gases into the interior region;
• a plurality of tubes configured to circulate water therein, the plurality of tubes extending through the interior region, the plurality of tubes including an inner set of tubes and an outer set of tubes, the inner set of tubes being closer to the burner than the outer set of tubes;
• baffle segments positioned in the interior region adjacent the outer set of tubes, adjacent baffle segments defining gaps for the flow of the combustion gases outwardly relative to the outer set of tubes.

A heat exchanger for heating water, the heat exchanger comprising:

• a shell at least partially defining an interior region;
• a burner positioned to deliver combustion gases into the interior region;
• a plurality of tubes configured to circulate water therein, the plurality of tubes extending through the interior region, the plurality of tubes including an inner set of tubes and an outer set of tubes, the inner set of tubes being closer to the burner than the outer set of tubes;
• the inner set of tubes and the outer set of tubes being positioned adjacent to one another such that the outer set of tubes is staggered from the inner set of tubes and tubes of the outer set of tubes are adjacent to tubes of the inner set of tubes;
• and
• baffle segments annularly positioned in the interior region adjacent the plurality of tubes, adjacent baffle segments defining gaps for the flow of the combustion gases.

A heat exchanger for heating water, the heat exchanger comprising:

• a shell at least partially defining an interior region;
• a burner positioned to deliver combustion gases into the interior region;
• a plurality of tubes configured to circulate water therein, the plurality of tubes extending through the interior region, the plurality of tubes including an inner set of tubes and an outer set of tubes, the inner set of tubes being closer to the burner than the outer set of tubes;
• baffle segments annularly positioned in the interior region adjacent the outer set of tubes, adjacent baffle segments defining gaps for the flow of the combustion gases outwardly relative to the outer set of tubes;
• a tube sheet positioned at an end region of the shell, the tube sheet being coupled to the plurality of tubes;
• and
• a header coupled to the shell, the header and the tube sheet together defining a cavity between the header and the tube sheet, the tube sheet further defining an inner set of apertures in water flow communication with the inner set of tubes and defining an outer set of apertures in water flow communication with the outer set of tubes.