Rinnai RGB-CTWH-3 Recess Box for RUS Tankless Water Heaters

Upgrade your Rinnai tankless water heater installation with the Rinnai RGB-CTWH-3 Recess Box, expertly designed for RUS model units. Engineered for precision, this recess box protects your appliance from harsh outdoor conditions while maintaining a clean, seamless aesthetic.

Built to enhance both function and appearance, the Rinnai Recess Box conceals the water heater within your wall, shields it from weather exposure, and allows for simple access when servicing is required. Perfect for residential or commercial installations, it helps extend product longevity and ensures consistent performance.

With Rinnai’s Common Venting System, multiple water heater units (up to 8) can share a single vent, reducing wall cuts, installation time, and material costs — making this recess box an essential accessory for efficiency and durability..

Key Features:

• Designed for RUS Models Only – Ensures a perfect fit with Rinnai RUS tankless water heaters.
• Weather Protection – Shields the appliance from wind, rain, and environmental elements.
• Flush-Mounted Installation – Recesses the unit into the wall for a cleaner, concealed look.
• Improved Drainage – Front drain holes enhance water flow and prevent buildup.
• Easy Maintenance – Removable front door provides full access for service and adjustments.
• Durable Construction – Built for long-lasting protection and performance in any environment.
• Flexible Venting Design – Supports Rinnai Common Venting with up to 8 connected units.
  

What’s Included

• 1 × Rinnai RGB-CTWH-3 Recess Box
• Installation hardware set
• Removable front access door
• Manufacturer installation guide
  

Specifications:

Care & Maintenance Instructions

• Clean the exterior with mild soap and water — avoid abrasive cleaners.
• Inspect drain holes periodically to ensure clear water flow.
• Check mounting hardware annually to ensure secure installation.
• Keep access door closed to prevent debris and weather exposure.
• If located in coastal or high-moisture environments, apply anti-corrosion protection annually.