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This paper presents the design, testing and analysis of the 5kW ammonia Capillary Pumped Two Phase Loop (CPL), developed in co-operation between MATRA MARCONI SPACE (MMS) and the French Space Agency (CNES). The ammonia CPL breadboard was designed to transport a 5 kW heat load over 5 meters. It consisted of: 5 parallel evaporators and isolators, 4 parallel condensers with an additional sub-cooler, a reservoir, to control the loop saturation temperature, two adiabatic pipes, one for the liquid line and one for the vapour line the testing instrumentation including thermocouples and absolute and differential pressure transducers.