The Hydrotherm HC-100 is a gas-fired boiler designed for residential and commercial applications. It typically features a cast iron heat exchanger for enhanced durability and efficiency, with a heating capacity of around 100,000 BTUs. The boiler operates with either natural gas or propane and is equipped with an electronic ignition system for reliable start-up. For specific technical details like dimensions, efficiency ratings, and installation requirements, it's advisable to consult the manufacturer's documentation or a professional technician.