Discover top propane tankless heaters that can support multiple fixtures across a whole house. This guide highlights five efficient, CSA/UL-listed units designed for indoor and outdoor installation, delivering reliable hot water on demand while optimizing energy use. Below is a quick summary table of the selected products to help you compare capabilities at a glance.
| Product | BTU / GPM | Install Type | Notes | |
|---|---|---|---|---|
| Camplux CA360W | 85,300 BTU / 3.6 GPM | Indoor Tankless | 2–3 zones | High efficiency with 0.93 UEF; 1-Touch presets |
| Camplux CX422 | 102,000 BTU / 4.22 GPM | Indoor Tankless | 2–3 points | ±1°F accuracy; anti-freeze feature |
| Camplux WA686LP | 199,000 BTU / 6.86 GPM | Outdoor Tankless | 4–8 points | Weather-resistant; high efficiency |
| Orbek Outdoor 120K | 120,000 BTU / 5.1 GPM | Outdoor Tankless | 2–4 fixtures | CSA certified; wind and weather resistant |
| ThermoMate CZ422LP | 102,000 BTU / 4.7 GPM | Indoor Tankless | 3–4 fixtures | High efficiency; multiple safety protections |
Note: All models listed are propane-powered tankless water heaters designed to supply continuous hot water on demand for whole-home use, with dimensions and compatibility varying by installation environment.
Camplux CA360W: 85,300 BTU Tankless
The Camplux CA360W delivers 85,300 BTU for efficient hot water across 2–3 zones, such as showers, kitchen, and laundry. It provides 100% continuous flow and supports recirculation-ready setups. Features include intelligent gas control, a premium heat exchanger for efficiency, and a 0.93 UEF rating that helps reduce utility use. It offers on-demand hot water with presets and a digital display for flow monitoring, supporting precise temperature control and year-round operation.
MIZUDO Gen 2 Outdoor Water Heater
The Mizudo Gen 2 unit provides up to 5.1 GPM at 120,000 BTU with self-modulating temperature control to keep accuracy within ±1°F. It is designed for outdoor installation and supports simultaneous use across multiple fixtures in larger homes. UL listed and CSA certified, it includes two-year unit support and five years for the heat exchanger. The system emphasizes efficiency, reducing standby losses and saving gas where possible.
Camplux CX422 Indoor Tankless
The Camplux CX422 delivers 102,000 BTU and 4.22 GPM, suitable for 2–3 water points in compact homes or apartments. It features sophisticated sensors and a smart chip to maintain water temperature within ±1°F, delivering very stable hot water. An anti-freeze protection feature helps prevent heat exchanger damage in cold conditions. Temperature control is precise, with a digital display facilitating simple adjustments.
Camplux WA686LP Outdoor Tankless
The WA686LP outdoor model offers 6.86 GPM at up to 199,000 BTU for whole-home performance with 4–8 fixtures supported. Its weather-resistant design is intended for outdoor installation, saving indoor space and preventing wind-related performance issues. It includes a smart heating control system and a durable heat exchanger, optimizing combustion for efficiency and consistent hot water across seasons.
Orbek Outdoor 120K BTU Tankless
The Orbek outdoor model provides 120,000 BTU with up to 5.1 GPM, capable of serving 2–4 fixtures simultaneously. It is designed for outdoor use with IPX4 protection and wind resistance for reliable performance in challenging conditions. CSA certified and equipped with features like dry combustion and flame protection to enhance safety and dependability in various climates.
ThermoMate CZ422LP Indoor Tankless
The ThermoMate CZ422LP delivers 102,000 BTU and 4.7 GPM for multi-point hot water across 3–4 fixtures. It uses a high-efficiency copper heat exchanger and a sophisticated flow sensor that maintains water temperature within ±1°F. Safety features address boil-dry protection, freeze protection, flameout protection, and overheat protection, while offering a favorable energy efficiency profile (UEF around 0.81).
Buying Guide: Key Purchase Considerations
- Water flow needs: Assess your household peak demand (number of bathrooms, showers, and appliances) to choose a unit with sufficient GPM and BTU output to avoid cold water shocks.
- Installation location: Indoor units save space but require venting and proper HVAC clearances; outdoor models require weatherproofing and wind considerations but free up interior space.
- Efficiency and operating costs: Look for units with high UEF/UEF-like ratings and precise temperature control to minimize gas use and energy waste.
- Safety features: Boil-dry protection, flame-out protection, anti-freeze measures, and high-temperature locks reduce risk and protect equipment over time.
- Compliance and warranties: Verify UL/CSA certifications and the manufacturer’s warranty coverage for ongoing support and service.
- Temperature stability: Systems with digital displays and fast response times provide safer, more consistent showers for all ages.
- Maintenance needs: Consider heat exchanger material (oxygen-free copper vs. stainless steel) and ease of serviceability when planning long-term use.
- Price vs. value: Compare upfront costs against efficiency features, installation requirements, and expected utility savings to determine total cost of ownership.