Choosing a propane tankless water heater with a recirculation pump can boost hot water delivery, save energy, and reduce wait times. This guide highlights top models from Rinnai and APUS, detailing how each unit handles flow, installation, and smart features. Read on to compare capacities, indoor/outdoor versatility, and recirculation capabilities to find the best fit for your home.
| Product | Brand | Max GPM | BTU | |
|---|---|---|---|---|
| Rinnai RXP160iN | Rinnai | 9 | 160,000 | Indoor/outdoor |
| Rinnai RXP199iN | Rinnai | 11.1 | 199,000 | Indoor/outdoor |
| Rinnai REP160iP | Rinnai | 6.6 | 160,000 | Indoor |
| Rinnai REP199eP | Rinnai | 7.9 | 199,000 | Outdoor |
| APUS Natural Gas Tankless 140k | APUS | 6.8 | 140,000 | Indoor |
Rinnai RXP160iN With Recirculation Pump
The Rinnai RXP160iN is a compact, condensing tankless water heater designed for indoor or outdoor installation using Versa Vent. It runs on propane or natural gas and delivers up to 9 GPM, supporting multiple fixtures simultaneously. Features include a quick flush option and a high efficiency factor (UEF .97). A built-in recirculation option is included with the model family, and a Controlr module is available for WiFi control (not included). Outdoor setup requires an RX-OVC vent cap.
Rinnai RXP199iN With Recirculation Pump
The Rinnai RXP199iN offers up to 11.1 GPM and 199,000 BTU, with indoor or outdoor installation. Built for versatility, it supports propane or natural gas via Smart Sense gas control and includes Versa Vent compatibility. It features a Quick Flush mechanism for quick maintenance and a favorable energy efficiency rating (UEF .98). A Controlr module enables optional WiFi control (not included). Outdoor use requires proper venting.
Rinnai REP160iP Smart-Circ Recirculation
This REP160iP model pairs a built-in recirculation pump with Smart-Circ technology. It learns your water-use patterns and schedules pumping to minimize wait times while maximizing energy efficiency. It provides up to 6.1 GPM and is designed for indoor installation. The unit includes a 15-, 5-, and 1-year warranty structure for heat exchanger, labor, and parts, respectively. A Controlr module is available for optional WiFi control (not included).
Rinnai REP199iP Smart-Circ Indoor Recirc
The REP199iP combines a built-in recirculation pump with Smart-Circ, designed for indoor use. It delivers up to 7.9 GPM and 199,000 BTU. The non-condensing design prioritizes compact size suitable for tight spaces, with a robust warranty package (heat exchanger, labor, and parts). Optional Controlr WiFi control is available (not included).
APUS 140k Natural Gas Tankless With Qi Boost
The APUS natural gas tankless water heater delivers 140,000 BTU with up to 6.8 GPM, supported by an oxygen-free copper heat exchanger. It features instant hot water delivery and a built-in booster pump to increase flow by up to 130%. The system emphasizes energy efficiency with a 24/7 ECO smart cycle and is designed to support simultaneous use across two showers and two sinks with minimal temperature fluctuation. Optional smart app control enhances monitoring and scheduling.
Buying Guide: Key Considerations And Comparisons
- Installation flexibility: Indoor vs. outdoor compatibility depends on venting, climate, and unit model. Versa Vent compatibility expands location options for many Rinnai units.
- Recirculation capability: All selected models feature built-in recirculation pumps or Smart-Circ technology, reducing wait times for hot water and improving overall efficiency.
- Flow rate and capacity: GPM ratings indicate how many fixtures can run simultaneously. Higher GPM is preferable for larger households or busy kitchens and baths.
- Fuel type and efficiency: Models support propane or natural gas. Look for high UEF (uniform energy factor) ratings to quantify efficiency gains; higher is better for long-term energy savings.
- Maintenance features: Quick Flush and accessible service ports simplify routine maintenance. Some models offer WiFi control for monitoring and adjustments.
- Warranty and support: Review heat exchanger, labor, and parts coverage. Longer coverage reduces ownership risk.
- Indoor sound and footprint: Compact designs save space, but check installation clearances and venting requirements to ensure a clean setup.
- Outdoor considerations: Outdoor models require weatherproof venting and protection from the elements. Verify vent caps and clearance requirements for safe operation.
- Smart features: WiFi management and remote control can enhance convenience but may require optional modules or apps (not included in base units).