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I have heard multiple names for water-source heat pumps. What's the difference between something called a water-to-water heat pump, and a seawater heat pump? Are they just different names for the same thing?

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They can be the same thing; the terms have overlapping meanings.

A seawater heat pump is a specific type of water-source heat pump that uses seawater. Water-source heat pumps can also use fresh water, e.g. from a lake or river.

The source is the first part of the meaning of "water-to-water". The second part means that the destination for the heat is water, most likely in a "wet" central heating system with pipes and radiators. One could also have a water-to-air heat pump, which would use water as the source but deliver the heat through hot air from a wall unit.

  • Thanks Flyto, this should be the clearest answer I've found. – Needa Hell Dec 27 '18 at 9:57

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