Answering the search intent: liquid propane water heaters deliver on-demand hot water with minimal standby energy, ideal for homes with high hot-water demand or limited venting options. The top picks here cover outdoor and indoor installations, high-GPM models, and portable options. This guide targets buyers seeking reliable LP tankless systems for whole-house use, multi-bath homes, and spaces where venting or space savings matter. The table below highlights five strong choices and how they fit common needs.
| Product | Best For | Key Benefit | Why It’s Included |
|---|---|---|---|
| Rheem RTG Outdoor 7.0 GPM | Large homes with outdoor install | Outdoor vent-free operation | High 7.0 GPM, 160,000 BTU/hr |
| Rheem RTG Indoor 7.0 GPM | Indoor installs with direct vent | Space-saving, indoor friendly | Same flow, easier indoor placement |
| Rheem RTGH 9.5 GPM Indoor | Big households, multi-showers | Condensing for ultra-low NOx | Highest 9.5 GPM, 199,900 BTU/hr |
| Rheem RTG 8.4 GPM Outdoor | Outdoor, multi-point use | Strong simultaneous usage | 8.4 GPM, 180,000 BTU/hr |
| CAMPLUX 6L Outdoor Tankless | Portable outdoor hot water | Compact and portable | Up to 6.4 GPM, CSA certified |
Rheem RTG Series Outdoor 7.0 GPM Liquid Propane Tankless Water Heater
Best for outdoor installations where venting is not required. This model delivers 7.0 GPM at a 35°F rise, equating to about 2-3 simultaneous showers. It runs on liquid propane with 160,000 BTU/hr output and uses non-condensing technology. The outdoor placement helps keep interior space free and minimizes indoor venting complexities. Best for large families needing dependable on-demand hot water without an energy-heavy electric tank. Caution: outdoor units are exposed to weather; ensure proper enclosure and qualified installation to avoid weather-related issues.
Rheem RTG Series Indoor 7.0 GPM Liquid Propane Tankless Water Heater
Best for indoor installations with direct vent systems. This 7.0 GPM unit mirrors outdoor performance in a compact, wall-mounted footprint, freeing floor space. It uses non-condensing technology with an energy factor around 0.82, delivering efficient on-demand hot water for homes with multiple taps running. Choose this if you prefer indoor placement and want to keep outdoor spaces clear. Limitation: needs proper venting and clearance for safe operation inside the living area.
Rheem RTGH Series Indoor 9.5 GPM Tankless Water Heater
Best for large households that need multiple showers simultaneously. This condensing model achieves 9.5 GPM at 35°F rise with 199,900 BTU/hr and an ultra-low NOx emission profile. It’s an indoor unit designed for direct vent installations and is notable for achieving high efficiency through condensing technology. Best for homes with high hot-water demand and where indoor venting is already in place. Caution: higher initial cost due to condensing components; ensure proper venting and clearance in indoor spaces.
Rheem RTG Series Outdoor 8.4 GPM Tankless Water Heater
Best for outdoor use with higher flow needs. This model provides 8.4 GPM at 35°F rise, supporting 3-4 showers simultaneously. It shares outdoor installation advantages with the 7.0 GPM outdoor unit, including vent-free operation indoors and a durable exterior cabinet. Choose this if your home has multiple bathrooms and you want to maximize outdoor installation benefits. Limitation: outdoor units still require weather protection and professional mounting for safe operation.
CAMPLUX 150,000 BTU Tankless Water Heater Outdoor
Best for outdoor, small-to-mid-scale hot-water needs where portability matters. This unit delivers up to 6.4 GPM under typical conditions and is CSA-certified with anti-freeze, overheating protection, and flame failure detection. It’s a practical option for cabins, RVs, or auxiliary spaces needing reliable on-demand water without permanent installation. Caution: operate only with adequate water pressure and ensure proper booster or pressure if supply is low.
Buying Guide: Key Considerations For Liquid Propane Tankless Water Heaters
- Household water demand: Evaluate your peak GPM needs. Families with multiple showers or baths benefit from higher GPM ratings (7.0–9.5 GPM).
- Installation location: Outdoor units simplify venting but require weather protection. Indoor units fit spaces with venting and wall clearance requirements.
- Ventilation type: Condensing models (RTGH) are more efficient and produce lower NOx, but may cost more upfront and require proper venting for indoor installs.
- Gas and venting compatibility: Ensure your gas line capacity and venting method match the selected model’s requirements.
- Energy efficiency: Look for higher Uniform Energy Factor (UEF) ratings; condensing units typically deliver better efficiency than non-condensing models.
- Space and mounting: Wall-mount designs save floor space; outdoor units demand weather protection and secure mounting.
- Maintenance and service: Regular inspection of gas connections, venting integrity, and scale buildup improves longevity.
FAQ
- What does GPM indicate in tankless water heaters?
– Gallons per minute (GPM) measures how much hot water the unit can deliver at a given temperature rise; higher GPM supports more simultaneous uses. - Are condensing LP tankless heaters worth it?
– Condensing models are generally more energy-efficient and produce lower NOx emissions, which can reduce operating costs over time, especially in larger homes. - Can I install an LP tankless heater indoors?
– Yes, if it is designed for indoor use and vented correctly. Indoor installations require appropriate venting and clearance as specified by the manufacturer. - What maintenance is typical for LP tankless heaters?
– Routine checks on gas lines, venting, and periodic descaling or flushing to prevent mineral buildup, especially in hard water areas. - Is outdoor installation safer for LP heaters?
– Outdoor units avoid indoor venting but require weather protection and proper mounting. Ensure weatherproof enclosures and professional installation. - Which unit is best for a multi-bath home?
– Units with higher GPM, such as 9.5 GPM indoor condensing models, are better suited for simultaneous showers and higher demand.