The TriMax Control helps the Esteem 399 wall-hung condensing boilers deliver 96 percent efficiency for improved system operation and reduce energy consumption in a variety of commercial applications requiring 16,000-399,000 Btuh. The control’s 60-second setup simplifies boiler installation for contractors by providing options appropriate to specific applications, allowing the boilers to be set up quickly and also minimizing the potential for errors. The control has a unique cascade system to join up to six boilers, and allows for up to four circulars and multiple temperature zones. To simplify troubleshooting, the TriMax Control provides clear error descriptions and records sensor readings for up to 24 hours. The Modbus communication feature allows information to be sent back to the building automation system in order to reduce downtime. An enhanced, highly efficient, reliable stainless steel fire tube heat exchanger improves water flow and heat distribution to maximize thermal efficiency. The boiler can be designed with direct or conventional venting made from PVC, CPVC, polypropylene, or Al29-4C materials to fit any code requirement.