High efficiency, fully condensing, fully modulating gas fired semi-instantaneous water heaters-000mbh to 0000 mbh input indirect steam-to-water and water-to-water heaters from 000 mbh to 0000 mbh. Mar 00, 0000. May 0, 0000. Hurst Boilers. May 0, 0000. Scotch Marine Fire-Tube boilers for steam and hot water up to 0000 HP industrial high Learn More 