Refrigeration is the process of removing heat from a product/ place to lower or maintain a temperature and expelling absorbed heat into the surroundings.
Heat Recovery captures the waste heat and recycles it to Heat a product/place in this instance it heats large volumes of water.
In the refrigeration cooling cycle, a circulation pump circulates water from an insulated holding tank through a tube in tube heat exchanger and returns it to the holding tank. Condenser fans are cycled through pressure switches for optimum performance.