This guide highlights top outdoor gas tankless water heaters, ideal for households that demand on-demand hot water with energy efficiency and durable outdoor installation. We compare models from well-known brands, focusing on flow rate, BTU, durability, control features, and ease of installation. Use the buying guide to evaluate what matters most for your home and climate, from high-GPM units for multi-bath homes to compact units for outdoor spaces. All selections are suitable for outdoor mounting and provide consistent hot water across multiple outlets.
| Product | Brand | Max GPM | BTU | Install Type | Notable Feature |
|---|---|---|---|---|---|
| FOGATTI Comfort 180S | FOGATTI | 8.1 | 180,000 | Outdoor | Remote panel, precise ±1°F temp control |
| Rheem RTG-70XLN-3 | Rheem | 7.0 | 160,000 | Outdoor | High efficiency, durable cabinet |
| VEVOR Tankless | VEVOR | 5.3 | 120,000 | Outdoor | Smart temp control, 32.8 ft control |
| Rheem RTG-84XLN-3 | Rheem | 8.4 | 180,000 | Outdoor | High efficiency, robust outdoor unit |
| APUS 190,000 BTU | APUS | 8.1 | 190,000 | Outdoor | WiFi & remote control, multi-outlet support |
FOGATTI Comfort 180S Outdoor Tankless Water Heater
The FOGATTI Comfort 180S is designed for outdoor installation with a robust 180,000 BTU input and up to 8.1 GPM flow. It provides instant hot water for showers, sinks, and appliances across multiple outlets without preheating delays. A bottom-mounted fan supports safe, stable combustion, improving durability in varying weather. Temperature is tightly controlled via water servo technology and sensors, maintaining a near-perfect temperature difference of ±1°F. The unit includes a remote indoor control panel for convenient operation from inside the home.
Rheem RTG-70XLN-3 Outdoor Tankless Tankless Water Heater
This high-efficiency model delivers up to 7.0 GPM with 160,000 BTUs, suitable for homes with 2–3 bathrooms and multi-point hot water needs. It’s built for outdoor installation and utilizes a durable metal cabinet with wall-mount capability by a qualified installer. The unit provides fast, reliable hot water even during peak demand, making it a strong option for family homes and busy households that require steady hot water across multiple fixtures.
VEVOR Gas Tankless Water Heater, 5.3 Gal Outdoor
VEVOR offers a 5.3-gallon capacity with 120,000 BTU/h input, delivering instant hot water for showers and more. It features ±1°F precision temperature control via smart sensors and includes a 32.8-foot wired control panel for easy temperature adjustments and unit switching. The system supports flexible operation for whole-house use and emphasizes stable water temperature during multi-fixture usage.
Rinnai RX199iN Condensing Smart Sense
Rinnai RX199iN combines indoor/outdoor installation flexibility with condensing technology and up to 11.1 GPM. Compatible with propane or natural gas through Smart Sense control, it supports a Versa Vent outdoor vent cap. The unit is compact for its capacity and offers a high energy efficiency factor (UEF .98). It provides a robust feature set, including an interface for remote control via a control module (not included) and quick flushing to maintain performance.
ORBEK Outdoor Gas Tankless Water Heater
Orbek offers a 120,000 BTU unit with 5.1 GPM flow, designed for outdoor installation. It’s suitable for 2–4 outlets and includes low-flow start technology for reliable hot water even at low usage. The heater integrates protective features such as anti-dry burning, anti-overheating, anti-leakage, anti-flameout, and anti-high water pressure, meeting CSA safety standards to ensure safe operation in homes and as a practical gift for households seeking dependable hot water.
APUS 190,000 BTU Outdoor Tankless Water Heater
APUS delivers 190,000 BTU and 8.1 GPM, designed for whole-house on-demand hot water. It supports up to five outlets and includes WiFi and remote control for temperature management from a mobile app. The compact outdoor-friendly design connects via standard 3/4″ water and gas lines and runs on outdoor power setups. This model emphasizes convenience with remote access and strong performance for larger homes needing multiple simultaneous hot water draws.
Buying Guide: Key Purchase Considerations
- Flow rate and household needs: For homes with multiple bathrooms or high simultaneous demand, target models offering 7–11 GPM. Smaller homes or limited outdoor space may benefit from mid-range units around 5–7 GPM.
- Fuel type and efficiency: All listed units use natural gas; condensing models typically achieve higher efficiency and lower long-term operating costs but may come with higher installation complexity.
- Outdoor installation readiness: Look for weather-resistant cabinets, corrosion resistance, and safety features like auto shutoff and flame monitoring. Verify clearances and venting requirements for outdoor use.
- Temperature control: Precision within ±1°F is ideal for stable showers and appliances. Consider units with remote or wired control options for convenient inside monitoring and adjustment.
- Connectivity and smart features: WiFi or app control allows temperature scheduling and remote adjustments, beneficial for households with variable occupancy or energy management goals.
- Installation and maintenance: Outdoor tanks typically require professional installation. Check serviceability, ease of flushing and descaling, and availability of replacement parts.
- Safety and certifications: CSA certification and other safety protections (anti-dry burning, anti-leakage, anti-overheating) are important for reliable outdoor performance in varying climates.
- Warranty and support: Review warranty terms and manufacturer support, especially for outdoor units exposed to weather and seasonal changes.
When choosing an outdoor gas tankless water heater, balance flow needs, climate, installation practicality, and smart features. The models above represent a range of capacities and control options to help find a solution that delivers reliable hot water while aligning with home energy goals.