The AIR Source Boiler is a hot fluid generator that extracts heat from ambient air conditions. This machine is dedicated for heating applications which makes it a reliable option for electrification and decarbonization initiatives. It can be used for space heating or domestic hot water production. Each module can be used stand-alone or combined with an optional water header for larger installations. The autonomous control system features high and low pressure avoidance and a smart defrost sequence for reliable operation.