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Johnston also offers a full line of deaerators, surge tanks and blow down heat recovery systems. These feedwater systems are also designed and built to a quality standard which allows us to offer a 10 year warranty, the only one in the industry. Johnston is well aware of the changing environmental requirements. While our standard Johnston burners can attain less than 30 ppm NOx, we know that some regions of the United States are requiring NOx emissions as low as 9 PPM. For these ultra-low NOx applications, we are working closely with the Gas Technology Institute to jointly develop a burner to meet these needs. Tour our Factory Now!