Profile: Rayes Boiler specializes in providing boilers and burners. Our 3-pass down-draft fire-tube packaged boiler utilizes 50% less fuel to create steam or hot water for any application. Combustion system of our boilers exhausts only 9 PPM of carbon monoxide. The concave bottom helps with the collection of mud and sludge along the sides of the interior of the boiler, for an easier washout when needed. The front and rear hinged doors swing open to allow easy access while cleaning tubes.