A swimming pool, Spa or combination of a swimming pool or spa is heated with a heat pump and a heat exchanger. The heat exchanger comprises a water input, a water output, a heating agent input, a heating agent output, an inner coil and an outer coil being disposed about the outer periphery of the inner coil; and a separator device being configured and disposed to separate the coils in order to minimize vibrating and rubbing against each other. The separator device comprises a first separator device portion having two rounded shoulder portions configured to permit the separator device to be rotated into position between the inner coil and the outer coil, a middle portion comprising two substantially C-shaped curves, which substantially C-shaped curves form a dog bone-shape, and a second separator device portion comprising two rounded configured to be turned or twisted upon assembly of the heat exchanger.