Rinnai Universal Recess Box for High Efficiency and High Efficiency Plus Exterior Tankless Hot Water Heaters

Item # 319642903 | Rinnai Part # RGB-25U-C | UPC Code 766156010767 | UNSPSC Code 40101825
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Product Overview

Precisely engineered accessories can add even more reliability, convenience and flexibility to Rinnai Tankless Water Heaters. With Rinnai Common Venting, up to 8 tankless water heater units share the same vent system. This allows for significantly fewer wall or roof cuts, less labor, and longer vent lengths than ever possible with single-unit tankless water heater venting.

  • HE universal recess box
  • Protects the appliance from wind, weather, and unwanted adjustments
  • Recesses the appliance into the wall
  • Hides the appliance from view
  • Drain holes located at the front of the box for improved draining capabilities in flush mounted installations
  • Removable door allows easy access for servicing
  • White finish
  • Package quantity 1
  • Stainless steel construction
  • 1-year limited warranty
  • *Note. Rinnai is changing the language in its warranty terms and conditions found in the current User Installation manuals. The existing statement will be replaced by the following: "This Limited Warranty applies only to products that are installed in the United States and Canada. Improper installation may void this Limited Warranty. It is recommended that a trained and qualified professional who has attended a Rinnai installation training class complete your installation." All warranties (old or new manual) will be honored as written above.

Proposition 65 Information

Prop65 Warning Icon WARNING: This product can expose you to chemicals including lead, lead compounds and carbon disulfide which are known to the State of California to cause cancer, birth defect or other reproductive harm. For more information, visit www.P65Warnings.ca.gov


Finish Family
Manufacturer Warranty
1 Year limited warranty
Stainless steel
Pack Size
Product Depth (in.)
Product Height (in.)
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Product Weight (lb.)
Product Width (in.)


1 Year limited warranty