A system for producing hot water in a livestock enclosure, wherein said system comprises a thermodynamic water heater comprising at least one collection circuit (5, 6) and a heat pump intended to heat the water, said heat pump consists of a water-to-water heat pump that is connected to said at least one collection circuit (5, 6) for collecting the heat energy and within which circulates a heat-transfer fluid, wherein at least one collection circuit (5, 6), comprises: (a) at least one comfort mat that comprises at least one elastomeric layer and that has two opposite faces (75, 76): - an upper face, adapted to undergo an elastic deformation and including at least one accommodation area on which an animal is intended to rest, and - a lower face, intended to rest on a receiving surface, wherein said at least one comfort mat includes several sealed cavities intended to contain said heat-transfer fluid, wherein said sealed cavities lie underneath at least part of said at least one accommodation area, (b) circulating means (8, 51), for generating a circulation of said heat-transfer fluid within said collection circuit (5, 6), including through said at least one comfort mat. wherein said system comprises a thermodynamic water heater comprising at least one collection circuit (5, 6) and a heat pump intended to heat the water, said heat pump consists of a water-to-water heat pump that is connected to said at least one collection circuit (5, 6) for collecting the heat energy and within which circulates a heat-transfer fluid, wherein at least one collection circuit (5, 6), comprises: (a) at least one comfort mat that comprises at least one elastomeric layer and that has two opposite faces (75, 76): - an upper face, adapted to undergo an elastic deformation and including at least one accommodation area on which an animal is intended to rest, and - a lower face, intended to rest on a receiving surface, wherein said at least one comfort mat includes several sealed cavities intended to contain said heat-transfer fluid, wherein said sealed cavities lie underneath at least part of said at least one accommodation area, (b) circulating means (8, 51), for generating a circulation of said heat-transfer fluid within said collection circuit (5, 6), including through said at least one comfort mat. (a) at least one comfort mat that comprises at least one elastomeric layer and that has two opposite faces (75, 76): - an upper face, adapted to undergo an elastic deformation and including at least one accommodation area on which an animal is intended to rest, and - a lower face, intended to rest on a receiving surface, wherein said at least one comfort mat includes several sealed cavities intended to contain said heat-transfer fluid, wherein said sealed cavities lie underneath at least part of said at least one accommodation area, - an upper face, adapted to undergo an elastic deformation and including at least one accommodation area on which an animal is intended to rest, and - a lower face, intended to rest on a receiving surface, wherein said at least one comfort mat includes several sealed cavities intended to contain said heat-transfer fluid, wherein said sealed cavities lie underneath at least part of said at least one accommodation area, (b) circulating means (8, 51), for generating a circulation of said heat-transfer fluid within said collection circuit (5, 6), including through said at least one comfort mat.