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1. A heat recovery system for recovering waste heat from exhaust gases that are expelled through flues that are generated as a byproduct from heating systems, comprising: a venting arrangement connected to the flues from any number of multiple heating systems; a motorized damper within each flue configured to direct the exhaust gases from each flue to optionally bypass the flues from the heating systems through said venting arrangement to an intake plenum; said intake plenum configured to direct the exhaust gases to a heat exchanger, said heat exchanger comprising a series of serpentine conduits between which the exhaust gases pass through; said heat exchanger is configured to connect to an exhaust plenum which is in turn configured to connect to an exhaust fan that draws the exhaust gases through the heat recovery system; said heat exchanger further comprising a series of inlet ports and outlet ports; said inlet ports located and configured to add coolant to said serpentine conduits at selected temperatures; said outlet ports located and configured to remove coolant from said serpentine conduits at selected temperatures; and a temperature sensor at each said inlet port and each said outlet port; and a PLC for operational control of each said motorized damper, each said insert port, each said outlet port, wherein said PLC: controls the position of each motorized damper; ensures proper isolation and sealing of inactive heating systems to maintain exhaust pressure and prevent improper venting in the heat recovery system; and selectively modulates heat recovery operations based on system conditions to optimize energy efficiency and operational safety of the heat recovery system.
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