The Boiler Buddy is designed to be used in heating systems with low-mass boilers, geothermal, chilled water applications, or low-mass radiation. Boilers operating at low loads will short cycle which leads to sooting, premature component failure (nuisance lockouts) and inefficiency. The Boiler Buddy tank is a factory insulated and jacketed storage tank, adding mass to the system and providing the necessary buffer to prevent short cycling.

Just added in 2011, the new 50-gallon BB-50-G model includes three aquastat wells for precise temperature measurement, especially for geothermal applications.

In 2010, the Boiler Buddy 119-gallon tank became available for larger hydronic heating and geothermal systems.

The BB-80-C was also added in 2010 and includes an internal heat exchanger coil. This feature allows for flexibility in design. Design applications include; hydronic buffer tank/heat supplemented by solar, geothermal, or wood boiler.