Rinnai gas Heaters

Tankless Water Heaters Venting and Accessories
March 6, 2020 – 11:19 am

A First in Both Concentric and PVC/CPVC Venting for Condensing Tankless Water Heaters On One Unit

The new RUC98i, RUC90i and RUC80i models of the Rinnai Ultra Series Tankless Water Heaters are the only tankless water heaters to offer Concentric Polypropylene or PVC/CPVC venting options on the same unit. The dual venting configuration on the top of the new RUC Tankless Water Heaters allows for maximum flexibility for installers and dealers — one Concentric vent or two PVC/CPVC pipes can be used for venting.

As the #1 selling brand of tankless water heaters in the U.S. and Canada, we still favor Concentric Polypropylene for its superior joint fit, no cure time, quick installation and reduced wall or roof penetrations, but as leaders in the industry, we understand that PVC/CPVC can sometimes be more readily available or preferred in some installations.

Rinnai is the only tankless water heater manufacturer to offer both Concentric and PVC/CPVC on the same unit, providing more venting options right out of the box — saving time, money and offering the best flexibility for faster installations in homes and businesses — from one project to the next.

Some of the dual pipe venting options that are now available with the RUC Tankless Water Heaters include:

  • 3" or 4" PVC/CPVC*
  • 3" Centrotherm InnoFlue Vent System (ULC-S636 listed)*
  • Snorkel and Tee Terminations*
  • IPEX Concentric and Low Profile Termination Kit*

*Reference Rinnai Tankless Water Heater Installation and Operation Manual for further information.

For concentric venting, installers simply remove and discard the exhaust adapter ring.

VENT TYPE NATURAL GAS UNITS MAXIMUM EQUIVALENT VENT LENGTH PROPANE UNITS MAXIMUM EQUIVALENT VENT LENGTH
Concentric PP 65 Feet* 41 Feet
Twin Pipe PP (Centrotherm) 41 Feet*

* Maximum equivalent vent lengths are specific to the fuel type of the tankless water heater. Use of elbows in installation will reduce the maximum vent length. It is imperative when performing equivalent vent length calculations, that you refer to the Installation Manual and any applicable technical bulletins.

For PVC/CPVC configurations, the intake cap is removed and discarded. With this option, installers can use three- or four-inch PVC/CPVC pipe for the intake and exhaust.

3" PVC/CPC
4" PVC/CPC 100 Feet* 65 Feet
See also:
Source: www.rinnai.us
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