The presence of a hot water heater tank helps to buffer the hot water lines and evens out the water pump activations, but the cold water side of the lines have such little capacity in them that the water pump tends to hammer on and off very quickly. A “pump silencing kit” with two long hoses helps to reduce the hammering and smooth the water pump activations. An “accumulator tank” provides an even larger buffer to better control the problem. A “variable flow pump” is an upgraded pump which can pump small amounts of water if needed, and avoids the hammering problem altogether.