A circulation pump must have a complete path to fully circulate the hot water from the heater to as close to the exiting faucet as possible. Most hot water circulation pumps are used for the bathroom sink, kitchen sink or the shower and bathtub faucets where instant hot water may be desired.
Use the provided connecting flanges and install the pump in horizontal position. The flanges provided by the pumps maker will have a threaded insert for the existing piping to be screwed into and then the pump can be connected to the pipe flange with the bolts. Depending on the hot water feed pipes diameter will determine the size of the proper fittings for the pipe to flange connection. The flanges will have a high temperature seal. Generally due to the small size of the water pump, it will not need any extra support other than the water pipes to secure the unit in place.
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