A coolant distribution unit providing reliant circulation of coolant in a liquid cooling system for a heat-generating component such as a computer server is disclosed. The coolant distribution unit includes a manifold unit having a supply connector to supply coolant to the heat-generating component and a collection connector to collect coolant from a heat exchanger. A first pump has an inlet coupled to the manifold unit and an outlet coupled to the manifold unit. The first pump circulates coolant from the inlet to the outlet. A second pump has an inlet coupled to the manifold unit and an outlet coupled to the manifold. The second pump circulates coolant from the inlet to the outlet. The second pump may be disconnected from the manifold unit, while the first pump continues to circulate coolant through the manifold unit.