Fluidic burner

In a water heater having a heat exchanger having one or more passages for the flow of water in heat exchange relation to a gas burner, the improvement wherein said gas burner is comprised of a gas manifold, an array of fluidic oscillators, each fluidic oscillator having a power nozzle connected to said gas manifold and an outlet for issuing a sweeping jet of gas, each said fluidic oscillator being spaced from its neighboring fluidic oscillator so that the sweeping jet of gas issuing from each fluidic oscillator is spaced a predetermined distance from its neighboring fluidic oscillators.

In a gas burner having a no moving part fluidic oscillator for issuing a sweeping jet of gas to a gas burning area spaced from said fluidic oscillator, a method of reducing Nox emissions from gas burning in said gas burning area comprising positioning a baffle plate on one side of said sweeping jet of gas for controlling air flow to said sweeping jet of gas.

A gas burner comprising a fluidic oscillator having a gas inlet for coupling to a source of gas and having an outlet for issuing a sweeping gas jet for mixing with ambient air and burning of mixed gas and air at a burn region spaced from said outlet, the improvement comprising a NOx insert in said burn region for lowering the flame temperature of burning gas in said burn region.