Leslie Controls F-1240LDW Constantemp Double Wall Low pressure steam-water Heater User Manual | Page 13 / 19 | Also for: F-940LDW Constantemp Double Wall Low pressure steam-water Heater, F-640LDW Constantemp Double Wall Low pressure steam-water Heater, F-340LDW Constantemp Double Wall Low pressure steam-water Heater