Condensate pumps are used in hydronic systems that cannot discharge excess condensate water via a gravity feed. Condensate pumps are usually electrically powered centrifugal pumps. They are used to remove condensate water from HVAC systems that cannot be accomplished via gravity, and therefore the water must be pumped up. Home units are often small and the pumps are rated at a fraction of a horsepower, but in commercial applications, the pumps and motors are much higher. Large industrial pumps may also serve as the feedwater pump for returning the condensate under pressure to a boiler.