| Installing a circulation pump for a water heater is a method  for obtaining a constant hot water situation at most faucet locations that the  pumps return pipe is connected. Shut off all electrical power and  main water pressure to the hot water heater. This may entail the closing of the  main water valve to the home depending on the plumbing situation in your own  residence. Cut into the hot water line that is coming from the water heater. You will also need to cut into the  cold water supply line that feeds the hot water heater. The check valve will be  placed on this pipe so only cold water can flow into the water heater and the  re-circulated hot water cannot flow out and back into the cold water line. Most  circulation pumps must run 24 hours a day and require a dedicated duplex  receptacle to provide power.
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