Abstract: A water heater including a storage tank, a combustion chamber, a burner for producing products of combustion, the burner positioned in the combustion chamber, a flue extending from the combustion chamber through the storage tank, and a baffle positioned within the flue and directing the flow of the products of combustion through the flue. The baffle includes multiple clockwise twist segments and multiple counterclockwise twist segments.

Abstract: A water heater includes a water container, a combustion chamber adjacent the, water container, a burner associated with the combustion chamber and arranged to combust fuel to heat water in the water container, a blower assembly positioned to receive combustion gases generated by the burner, a shield positioned below at least a heating portion of the burner, a diverter that directs combustion air into the combustion chamber below the shield, and a passageway that directs at least a portion of the combustion air from the combustion air inlet, as primary combustion air, to the burner.

Abstract: An improved thickening agent is disclosed comprising a polyurea metal salt wherein the polyurea portion of the molecule is prepared by reacting a diisocyanate, a diamine with a monoisocyanate or monoamine. The metal salt is prepared by reacting the polyurea compound with an acid group, such as a carboxylic or a sulfonic acid group, and neutralizing the terminal acid group with a basic metal compound.

Abstract: Polyurea-based greases containing as an extreme-pressure additive an alkali metal triborate introduced or produced in the grease in aqueous solution.