Intell SeriesSolid Fuel Fired Boilers The Intell series of boilers is a truly packaged and compact range, available in capacities of 0.6 TPH to 4.5 TPH. The necessary automation for fuel feeding, air to fuel ratio, cut off/ cut in of boilers are inherent in design along with safety features. Inputs on parameters are provided via alerts, to help optimize operations, reduce fuel costs and get quality steam.