• Engineered especially for gas appliance venting
• Positive fit and lock allows for installation assurance
• Two layers of pipe equals two layers of protection
• Seals at every joint expand and contract with weather and temperature changes, so there's no flexing or cracking in the venting
• No flammable, messy or harmful glues, cements, or solvents are used

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Rinnai RCi Series Tankless Water Heaters utilize concentric venting with an inner pipe that is designed to withstand varying flue temperature conditions that may be experienced over the life of a condensing product. The Ubbink Rolux condensing concentric vent system is considered part of the direct vent tankless water heater, and has been tested and approved with the appliance by a third party testing agency. From the Manufacturer Rinnai RCi Series Tankless Water Heaters utilize concentric venting with an inner pipe that is designed to withstand varying flue temperature conditions that may be experienced over the life of a condensing product. The Ubbink Rolux condensing concentric vent system is considered part of the direct vent tankless water heater, and has been tested and approved with the appliance by a third party testing agency.