We have been manufacturing Scotch Marine firetube boilers for process steam, hot water & waste heat recovery in Hutchinson, Kansas since 1930. Over 14,000 of our boilers have been shipped throughout the United States and all over the world. We offer 2-pass and 3-pass dryback high pressure steam, low pressure steam or hot water Scotch Marine Boilers with capabilities from 30 through 1800 HP (gas, oil or combination gas/oil). Our 3-pass wetback Scotch Marine packaged boilers are available with high or low pressure steam or hot water in 70 to 1800 HP capacities (gas, oil or combination gas/oil). Our waste heat recovery systems are custom designed and are available in single pass, two pass or three pass units with high or low pressure steam or hot water. Also available is a dual chamber model accomodating supplemental firing. If you are looking for horizontal return tubular (HRT) boilers or condensate return feedwater systems, we've have them too