The paper contains results from the operation of a pilot heat pump. The plant is operated on the ＇＇zeolith - water＇＇ system. By indirect heat transmission from the adsorber to the desorber with a heat carrier, oil circulation, an experimental hear ratio of more than two has been reached. Thereby it is shown that solid-state heat pumps, operating oil the principle of an ＇＇overlapping of the temperature＇＇, can produce the results from multi-stage heat pumps.