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Rinnai Tankless Hot Water Heaters

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Venting and Accessories

Tankless water heaters have special venting requirements and must only be vented with a dedicated, sealed vent system.

  • Installation must be completed by a licensed plumber.
  • Rinnai venting is required.

More venting information below:

More venting information:
  • You must use vent components that are certified and listed with the water heater model.
  •  Do not combine vent components from different manufacturers.
  • The vent system must vent directly to the outside of the building and use outside air for combustion.
  •  Venting should be as direct as possible with a minimum number of pipe fittings.
  •  Avoid dips or sags in horizontal vent runs by installing supports per the vent manufacturer’s instructions.
  • Support horizontal vent runs every four feet and all vertical vent runs every six feet or in accordance with local codes.
  • Vent diameter must not be reduced.
  • Do not connect the venting system with an existing vent or chimney.
  • Do not common vent with the vent pipe of any other water heater or appliance.
  • Vent connections must be firmly pressed together so that the gaskets form an air tight seal.
  • Refer to the instructions of the vent system manufacturer for component assembly instructions.

 Download PDF File to demonstrate how to cut vent pipe


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