Burner and water heater comprising same

A water heater comprising:

• a burner including a mixing chamber, in which a fuel and air are mixed to generate a mixture, and a plate-shaped distribution plate configured to generate a combustion reaction when the mixture is ejected;
• a combustion chamber configured such that flames generated through the combustion reaction are located in an interior thereof;
• a heat exchanger configured to heat water by using heat generated through the combustion reaction;
• and
• a combustion chamber heat insulating pipeline configured such that water flows to an outside of the combustion chamber for heat-insulating the combustion chamber,
• wherein when a direction, in which the combustion gas generated through the combustion reaction flows, is defined as a reference direction, one direction that is perpendicular to the reference direction is defined as a lengthwise direction, and a direction that is perpendicular to the reference direction and the lengthwise direction is defined as a widthwise direction,
• a plurality of through-holes are disposed in the distribution plate along the reference direction to be spaced apart from each other along the lengthwise direction and the widthwise direction such that the mixture pass therethrough, and
• the distribution plate includes a central portion located at a center with respect to the widthwise direction, and outskirt portions located on opposite sides of the central portion, and
• wherein the through-holes formed at the outskirt portions are disposed such that outer distal ends of flames formed by the mixture passing through the through-holes disposed at the outskirt portions with respect to the widthwise direction are located on an inner side of a portion of a side wall of the combustion chamber, which contacts the combustion chamber heat insulating pipeline,
• wherein a spacing interval between the through-holes disposed in the central portion is smaller than a spacing interval between the through-holes disposed at the outskirt portions.