Heater appliance, in particular electric storage water heater, comprising an electrical connection system between one or more resistances (R, R2, R3, Rn-th) and a thermostat (T) of the heater appliance, said one or more resistances (R, R2, R3, Rn-th) being of the "candle"-type from the two ends (MR', MR) whereof two pins (FR) protrude, said one or more resistances (R, R2, R3, Rn-th) being constituted by a resistive filament contained in a metal tube armor bent on itself to form two parallel branches, wherein the first one (R) of said one or more resistances (R, R2, R3, Rn-th) comprises a pair of connectors (1; B) constrained to said two pins (FR), said pair of connectors (1; B) comprising female fastons (1.CR) located in a position in axis with male fastons (CT) of said thermostat (T), for the purpose of axial insertion for the reciprocal coupling, characterised in that each of said pair of connectors comprises: - a first arm (1.1) developing orthogonally outwards with respect to the longitudinal axis of said resistance (R), said first arm (1.1) having: - the proximal end (1.10) adapted to be constrained to one of said two pins (FR), - the distal end (1.11) connected to a second arm (1.2), - said second arm (1.2) developing substantially orthogonally with respect to said first arm (1.1) and having the distal end (1.20) connected to one of said female fastons (1.CR), - said female faston (1.CR) being directed downwards, orthogonally to said second arm (1.2). said one or more resistances (R, R2, R3, Rn-th) being of the "candle"-type from the two ends (MR', MR) whereof two pins (FR) protrude, said one or more resistances (R, R2, R3, Rn-th) being constituted by a resistive filament contained in a metal tube armor bent on itself to form two parallel branches, wherein the first one (R) of said one or more resistances (R, R2, R3, Rn-th) comprises a pair of connectors (1; B) constrained to said two pins (FR), said pair of connectors (1; B) comprising female fastons (1.CR) located in a position in axis with male fastons (CT) of said thermostat (T), for the purpose of axial insertion for the reciprocal coupling, characterised in that each of said pair of connectors comprises: - a first arm (1.1) developing orthogonally outwards with respect to the longitudinal axis of said resistance (R), said first arm (1.1) having: - the proximal end (1.10) adapted to be constrained to one of said two pins (FR), - the distal end (1.11) connected to a second arm (1.2), - said second arm (1.2) developing substantially orthogonally with respect to said first arm (1.1) and having the distal end (1.20) connected to one of said female fastons (1.CR), - said female faston (1.CR) being directed downwards, orthogonally to said second arm (1.2). - a first arm (1.1) developing orthogonally outwards with respect to the longitudinal axis of said resistance (R), said first arm (1.1) having: - the proximal end (1.10) adapted to be constrained to one of said two pins (FR), - the distal end (1.11) connected to a second arm (1.2), - the proximal end (1.10) adapted to be constrained to one of said two pins (FR), - the distal end (1.11) connected to a second arm (1.2), - said second arm (1.2) developing substantially orthogonally with respect to said first arm (1.1) and having the distal end (1.20) connected to one of said female fastons (1.CR), - said female faston (1.CR) being directed downwards, orthogonally to said second arm (1.2). <EOS>