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Tekmar Power Manager - 3 Aux Pumps, 4 Demands. Power Manager 346 is designed to allow non-tekmar products to interface with a tekmarNet??4 communicating heating system. It can be used in applications that use 3rd party rmostats, zoning devices, or mechanical equipment that requires a hot water demand from boiler system. This product provides demand inputs for up to 4 different reset water temperatures (high temp, low temp 1, low temp 2, low temp 3). It has capability of switching 3 pump outputs and provides wiring for up to 3 tekmarNet??4 devices, as well as 4 separate demand inputs to create a heat call on one of up to 4 possible reset water temperatures.