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:

• 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.