Assembly, including: - a SOEC/SOFC-type solid oxide stack operating at high temperature, including: - a plurality of electrochemical cells each formed of a cathode, an anode and an electrolyte inserted between the cathode and the anode, and a plurality of intermediate interconnectors each arranged between two adjacent electrochemical cells, - an upper end plate and a lower end plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a system for clamping the SOEC/SOFC-type solid oxide stack, including an upper clamping plate and a lower clamping plate, between which the SOEC/SOFC-type solid oxide stack is clamped, characterised in that it further includes: - a system for superheating the gases at the input of the SOEC/SOFC-type solid oxide stack, including: - at least one heating plate integrated in the thickness of at least one of the upper and lower clamping plates suitable for heating the gases to be heated, - at least one upper gas superheating end plate (65, 43), positioned between the upper clamping plate and the SOEC/SOFC-type solid oxide stack, and/or a lower gas superheating end plate (66, 44), positioned between the lower clamping plate and the SOEC/SOFC-type solid oxide stack, each gas superheating end plate (65, 43, 66, 44) including a gas circulation circuit from a first end, where the gases to be heated arrive, to a second end, where the heated gases are discharged towards the stack, - at least one input duct of the gases to be heated communicating with the first end of a gas superheating end plate (65, 43, 66, 44), such that a stream of gas to be heated entering said at least one input duct circulates in the gas circulation system, from the first end to the second end to reach the input of the SOEC/SOFC-type solid oxide stack. - a SOEC/SOFC-type solid oxide stack operating at high temperature, including: - a plurality of electrochemical cells each formed of a cathode, an anode and an electrolyte inserted between the cathode and the anode, and a plurality of intermediate interconnectors each arranged between two adjacent electrochemical cells, - an upper end plate and a lower end plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a plurality of electrochemical cells each formed of a cathode, an anode and an electrolyte inserted between the cathode and the anode, and a plurality of intermediate interconnectors each arranged between two adjacent electrochemical cells, - an upper end plate and a lower end plate, between which the plurality of electrochemical cells and the plurality of intermediate interconnectors are clamped, - a system for clamping the SOEC/SOFC-type solid oxide stack, including an upper clamping plate and a lower clamping plate, between which the SOEC/SOFC-type solid oxide stack is clamped, - a system for superheating the gases at the input of the SOEC/SOFC-type solid oxide stack, including: - at least one heating plate integrated in the thickness of at least one of the upper and lower clamping plates suitable for heating the gases to be heated, - at least one upper gas superheating end plate (65, 43), positioned between the upper clamping plate and the SOEC/SOFC-type solid oxide stack, and/or a lower gas superheating end plate (66, 44), positioned between the lower clamping plate and the SOEC/SOFC-type solid oxide stack, each gas superheating end plate (65, 43, 66, 44) including a gas circulation circuit from a first end, where the gases to be heated arrive, to a second end, where the heated gases are discharged towards the stack, - at least one heating plate integrated in the thickness of at least one of the upper and lower clamping plates suitable for heating the gases to be heated, - at least one upper gas superheating end plate (65, 43), positioned between the upper clamping plate and the SOEC/SOFC-type solid oxide stack, and/or a lower gas superheating end plate (66, 44), positioned between the lower clamping plate and the SOEC/SOFC-type solid oxide stack, each gas superheating end plate (65, 43, 66, 44) including a gas circulation circuit from a first end, where the gases to be heated arrive, to a second end, where the heated gases are discharged towards the stack, - at least one input duct of the gases to be heated communicating with the first end of a gas superheating end plate (65, 43, 66, 44), such that a stream of gas to be heated entering said at least one input duct circulates in the gas circulation system, from the first end to the second end to reach the input of the SOEC/SOFC-type solid oxide stack.