A brewing machine into which a portion capsule containing a brewing material can be inserted in order to produce a hot brewed drink, the brewing machine comprising: - a heatable pressure chamber for receiving water; - a brewing chamber for receiving the portion capsule ; - a fluid connection between the pressure chamber and the brewing chamber ; - a first piercing or slitting means for piercing or slitting the portion capsule inserted into the brewing chamber at a first capsule location (KO1) on the capsule surface; - a second piercing or slitting means for piercing or slitting the portion capsule inserted into the brewing chamber at a second capsule location (KO2) on the capsule surface; - wherein the portion capsule inserted into the brewing chamber can be flowed through with hot water and/or hot steam generated in the pressure chamber, from the first capsule location (KO1) to the second capsule location (KO2) of the portion capsule , in order to obtain a hot brewed drink emerging from the second capsule location (KO2), which can flow into a second chamber (K2); - a temperature control chamber (TK) being arranged in the fluid connection between the pressure chamber and the brewing chamber ; - the temperature control chamber (TK) comprising a phase change material as a heat storage; - the brewing machine comprising a structural unit into which one can insert a portion capsule containing a brewing material or fill in loose brewing material to produce a hot brewed drink; and - wherein the brewing chamber is contained in the structural unit and the structural unit can be moved into the brewing machine to an operating position or can be moved out of it to a loading position, characterized in that a barrier member (BG'; BG"; BG*; BG**) having a plurality of barrier openings (BO) is assigned to the structural unit, wherein the barrier member can be moved back and forth between a loading position, in which a portion capsule containing brewing material can be inserted into the structural unit or loose brewing material can be filled, and an operating position, in which the barrier member can form part of the wall of the brewing chamber . - a heatable pressure chamber for receiving water; - a brewing chamber for receiving the portion capsule ; - a fluid connection between the pressure chamber and the brewing chamber ; - a first piercing or slitting means for piercing or slitting the portion capsule inserted into the brewing chamber at a first capsule location (KO1) on the capsule surface; - a second piercing or slitting means for piercing or slitting the portion capsule inserted into the brewing chamber at a second capsule location (KO2) on the capsule surface; - wherein the portion capsule inserted into the brewing chamber can be flowed through with hot water and/or hot steam generated in the pressure chamber, from the first capsule location (KO1) to the second capsule location (KO2) of the portion capsule , in order to obtain a hot brewed drink emerging from the second capsule location (KO2), which can flow into a second chamber (K2); - a temperature control chamber (TK) being arranged in the fluid connection between the pressure chamber and the brewing chamber ; - the temperature control chamber (TK) comprising a phase change material as a heat storage; - the brewing machine comprising a structural unit into which one can insert a portion capsule containing a brewing material or fill in loose brewing material to produce a hot brewed drink; and - wherein the brewing chamber is contained in the structural unit and the structural unit can be moved into the brewing machine to an operating position or can be moved out of it to a loading position, <EOS>