Important things to know about Rinnai Tankless Water Heater installation

Rinnia tankless water heaterIs a good choice for you?

Tankless water heaters have many benefits but may not be practical for everyone. Give us a call to discuss your situation and will go over the pros and cons. We promise not to sell you something you don't need.

Because tankless water heaters provide hot water only when it's needed, they can save you up to 40%* on your energy bill. They feature Energy Factors of 0.82 up to 0.96, while tanks are typically 0.60.

* As based on the average cost to run an electric tank water heater per the DOE Average Energy Costs (


Depending on placement within the home, internal Rinnai Tankless Water Heaters can vent vertically through the roof or horizontally through an exterior wall. Each option features concentric venting that requires only a single wall penetration for both the intake and exhaust and has zero clearance to combustibles.

External Rinnai Tankless Water Heaters do not require additional venting.

Gas Line Sizing

Rinnai Tankless Water Heaters typically require a ¾” gas line to provide a sufficient gas supply to the unit’s burner. However, if there is sufficient pressure and the gas line is short enough, there are some cases where a ½” gas line can be used, which is the most common size used in the United States and Canada. This can make switching from a tank-style water heater to a tankless water heater faster, easier and less expensive.

As with all tankless water heater applications, installers should check and abide by local gas-pipe size and licensing rules and codes.

Proper Installation

Rinnai recommends that tankless water heater installation should be performed by a licensed contractor who is trained to handle the plumbing, gas, electrical and venting aspects of a tankless water heater and is aware of all local and national codes. Having a non-licensed professional perform the installation can cause operational and performance issues.

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