UL 834 explains electrical boiler requirements and allowable appliance construction. NEC, NFPA address other details of construction such as field connections, temperature derating, room conditions, and many other associated design. Reimers follows the codes as directed and then some additional steps to provide added safety. One step is providing labels with load and type data for service persons, the addition of straps for bonding as part of assured ground path from remote parts, seismic apparatus when ordered, moisture shielding, additional continuity screws in metal, high thread count bolts and non corroding parts.