The invention relates to a hydraulic switch for heating and/or cooling systems, which hydraulic switch is arranged between at least one generator circuit (K1) and at least one consumer circuit (K2) and has a switch housing (2), the longitudinal axis (A) of which runs substantially vertically when the switch (1) is in the installed state and the interior of which has a chamber (3) for a temperature carrier fluid, wherein on the switch housing (2) at least one first feed line (4) leads to the generator circuit and at least one first return line (5) leads to the generator circuit (K1), and at least one second feed line (6) and one second return line (7) can be connected to the consumer circuit (K2), wherein between the first feed line (4) and the second feed line (6) there is arranged a first flow-guiding element (8) extending in the flow direction, and between the first return line (5) and the second return line (7) there is arranged a second flow-guiding element (9) extending in the flow direction, wherein the first and the second flow-guiding elements (8, 9) are in each case in the form of a circumferentially open bent tube with an opening angle (a) which ensures the compensation of a large volume flow.