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Use WM-6.0 and Wilo Pump as the heat source for your domestic recirculation system. Only circulate through the mini tank, extending the life of your tankless water heater by not subjecting it to constant recirculation. Use WM-6.0 as a buffer tank to eliminate cold water sandwich, which is possible with frequent on/off operation of the tankless. Cold water, sandwiched between hot water, is diluted into the mini tank and eliminated. Seal-less magnetic drive circulator with union or solder connection. Jet Connect fitting pack included. Compact, magnetic drive design. Six inch power cord included. Optional timer available. Domestic hot water re-circulation systems. NSF approved for drinking water applications. Recirulate using WaiWela WM-6.0 Mini Tank.