The Salt at WAll: Thermal ExcHanges (SWATH) experiment is one of the research activities of the European H2020 SAMOFAR project (Safety Assessment of the Molten Salt Fast Reactor - MSFR). The main objective of the SWATH experiment is to improve CFD molten salt numerical models used for design and safety studies. This paper presents the design of the SWATH facility and of some of the test sections that are currently being studied. These sections include open and close channels geometries equipped with an electrical heater.