Quick answer
A water-source heat pump is a self-contained unit, usually in a condo closet, that rejects heat into the building's water loop instead of an outdoor condenser. In Miami high-rises they are serviced for clogged water coils, failed valves and compressors, drain problems and fan motors, and replaced like-for-like with the building engineer isolating the loop.
Written by Sylvia Denton, HVAC Guides Editor. Updated 2026-09-22.
In a water-source system there is no condenser on your balcony. Each unit's compressor pushes heat into water that circulates through the whole building and out to a cooling tower on the roof. The unit in your closet handles cooling, dehumidifying and, in heat pump mode, heating.
These systems are common in older towers along Brickell, Downtown, Edgewater and Miami Beach. They are efficient when maintained, but the water side adds failure points a normal split system does not have: scale and debris in the water coil, isolation valves that stick, and flow switches that shut the unit down.
Working on them means coordinating with the building. Many associations require the building engineer to be present, or to isolate the loop, whenever a unit is opened on the water side. We handle that scheduling before we arrive.
