We are proud to be recognized as one of the top providers of heating services in Danvers, MA, specializing in heating and hot water boilers. Cast iron boilers, which provide both heating and hot water, have long been a reliable and durable choice. These boilers, which typically vent through a chimney, can operate on natural gas, propane, or oil. They generally offer an efficiency of 85 to 87 percent, although this efficiency decreases over time.