Originally, it was a hot air design. The changeover to a water based system enabled the unit to provide household hot water and was adaptable to forced air and hydronic systems that could channel the heat to multiple locations. With each successful step, the pair felt more confident about making a unit for their neighbors.
Knowing they had a good idea, Jerome and Bobby began working on a market plan. They exhibited The Hardy furnace at fairs and farm shows. They made a good pair. Jerome was overseeing construction and manufacturing. Bobby took charge of the furnace tank welding.
In 1979, Jerome applied for and received a patent on the heater and the company began to take shape. It was the beginning of a multi-million dollar, nationwide business and another American dream was born.