Heating and cooling is a balance of science and equipment functioning together in various applications — such as hydronics. Although hydronic science dates back to ancient Rome, the equipment and techniques used by technicians have reached a level of sophistication unrivaled by its previous iterations. The boiler, a key component of a hydronic system, has changed as well. No longer warming the baths of Roman citizens, modern boiler applications are designed for comfort and efficiency. The proper installation and maintenance of boilers does not come with cookie-cutter schematics and instructions. There are, however, a small army of those willing to help technicians provide and maintain the best possible boiler for hydronic systems.