Upgrade your home’s hot water system with the Rinnai RE Series 8.5 GPM Outdoor Natural Gas Tankless Water Heater (RE180EN) — a high-efficiency, space-saving solution engineered for performance and durability. Designed to deliver continuous hot water for multiple applications, this non-condensing outdoor water heater is perfect for modern households seeking reliability, energy efficiency, and convenience.

With a compact copper heat exchanger, LED display, and programmable service reminders, the Rinnai RE180EN combines innovation with simplicity. Built with safety features and optional freeze protection, it ensures dependable performance in all climates.

Ideal for outdoor installations, this unit provides an impressive 180,000 BTUs of heating power and up to 8.5 gallons per minute (GPM) of hot water capacity — enough to handle multiple showers, faucets, and appliances simultaneously.

Why Choose Rinnai RE180EN?

The Rinnai RE180EN delivers endless hot water, lower energy costs, and superior reliability in a compact outdoor-ready design — making it an ideal upgrade for homeowners who value performance and efficiency.

Key Features:

• Powerful Hot Water Output: Delivers up to 8.5 GPM for consistent water flow across multiple fixtures.
• Compact, Space-Saving Design: Sleek 14.05" x 22.87" x 10.77" body fits outdoor setups with ease.
• High Efficiency: 0.82 Uniform Energy Factor (UEF) for energy savings and performance.
• Smart Maintenance: LED screen and programmable service reminders simplify upkeep.
• Durable Copper Heat Exchanger: Provides long-lasting performance and efficient heat transfer.
• Safety-First Design: Includes safety handle, seating bracket, and optional leak detection kit.
• All-Climate Use: Optional freeze protection available for cold environments.
• Reliable Power: Rated at 180,000 BTUs for powerful, consistent heating.
• Outdoor-Ready: Specifically designed for outdoor installation and natural gas operation.
  

What’s Included

• Rinnai RE Series 8.5 GPM Indoor Tankless Water Heater (Model RE180EN)
• Safety handle and seating bracket
• User manual and installation guide

(Isolation Valve MIVK-T-LW and optional accessories sold separately.)

Specifications:

Care & Maintenance Instructions

• Inspect Annually: Have a licensed technician perform a yearly maintenance check for optimal performance.
• Clean Exterior: Wipe the outer surface with a soft, damp cloth; avoid harsh chemicals or abrasives.
• Flush System: Descale the unit annually to prevent mineral buildup, especially in hard-water areas.
• Monitor Filters: Check and clean air and water filters regularly.
• Winter Care: Use the optional freeze protection kit in colder climates to safeguard the heater.