Rheem RTG-84XLN-3 Outdoor Tankless Water Heater
$964.10 on Amazon.com (as of October 16, 2026, 7:45 PM EST) View details ↗
Upgrade your home’s hot water system with the Rheem RTG-84XLN-3, a high-performance outdoor natural gas tankless water heater designed for continuous, on-demand hot water without the wait. Perfect for large families or multi-bathroom homes, this 180,000 BTU model delivers a 8.4 GPM flow rate at a 35°F rise, ensuring up to three simultaneous showers with consistent performance. Its non-condensing design eliminates the need for venting, simplifying outdoor installation while maintaining energy efficiency—saving up to 34% on energy costs compared to traditional 50-gallon electric tank heaters.
Built for durability and safety, the RTG-84XLN-3 features a CSA-certified heat exchanger with a 15-year warranty and a 5-year parts warranty, offering long-term reliability. Advanced safety features like freeze protection, flame failure protection, and a multi-point safety system ensure peace of mind. The digital LED control panel allows precise temperature adjustments (±1°F) for consistent comfort, while the included mounting hardware and installation manual make setup straightforward—though professional installation is required. Ideal for outdoor use, this tankless water heater combines efficiency, performance, and convenience for whole-house applications.
| Output (BTU/hr) | 180,000 BTU |
|---|---|
| Flow Rate | 8.4 GPM at 35°F rise |
| Energy Efficiency | 0.82 UEF (saves up to 34% vs. 50-gal electric tank heaters) |
| Warranty | 15-year heat exchanger, 5-year parts |
| Installation | Outdoor (no venting required), wall-mounted |
| Safety Certifications | CSA Certified |
