Best WiFi Gas Water Heaters for Instant on-Demand Hot Water
Choosing a WiFi-enabled gas tankless water heater can boost comfort and efficiency in any home. This guide highlights five top options, each offering remote control, fast hot water, and reliable performance. Read on to compare features, installation flexibility, and energy-saving capabilities to find the right fit for your needs.
| Product | Brand | Flow (GPM) | Indoor/Outdoor |
|---|---|---|---|
| APUS Natural Gas Tankless Water Heater 140,000 BTU | APUS | Up to 6.8 | Indoor |
| APUS 190,000 BTU Outdoor Tankless Water Heater | APUS | 8.1 | Outdoor |
| MIZUDO Natural Gas Tankless Water Heater | MIZUDO | Up to 5.1 | Indoor/Outdoor Convertible |
| NEW Rinnai RX199iN Condensing Smart Sense | Rinnai | Up to 11.1 | Indoor/Outdoor |
| Rheem Natural Gas Condensing Tankless | Rheem | Up to 9 | Indoor |
APUS Natural Gas Tankless Water Heater 140,000 BTU Indoor Installation Up to 6.8 GPM
APUS integrates instant hot water with intelligent heating technology. A 140,000 BTU burner powers a copper heat exchanger to deliver hot water quickly, with a claimed 1-second response. The exclusive single-circulation system minimizes cold-water delay and reduces energy consumption by up to 40% in ECO smart cycles. A built-in booster pump increases flow by up to 130%, allowing about 6.8 GPM, suitable for two showers and two sinks simultaneously without temperature swings.
APUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Natural Gas
This outdoor model delivers 190,000 BTU and about 8.1 GPM for whole-home use. It supports multiple fixtures—up to three showers plus two faucets—while maintaining performance even with weak pressure thanks to a 0.79 GPM minimum flow. You can remotely control temperature via the app or wired controller with a precise range and ±1°F accuracy. Its compact outdoor design connects to standard 3/4″ plumbing and 120V power for straightforward installation.
MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible Installation
Mizudo offers a flexible indoor/outdoor solution with a convertible installation kit. The unit supports smart WiFi and app control, enabling remote temperature adjustments, energy-use monitoring, and maintenance alerts. Advanced temperature control uses flow monitoring and gas modulation to keep showers within about 1°F of target, reducing temperature fluctuations during high-demand periods.
APUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Propane
This propane-based outdoor model mirrors the gas-on-demand efficiency of its natural-gas counterpart with 190,000 BTU and 8.1 GPM. It supports 3 showers and 2 faucets simultaneously, with a minimum flow of 0.79 GPM to handle low-water-pressure scenarios. Remote temperature control via app or wired controller, plus outdoor-ready dimensions, makes it a clean fit for outdoor installations while keeping indoor spaces uncluttered.
Rheem RTG-95DVELN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater
Rheem’s model provides up to 9.5 GPM with a 199,900 BTU input, designed for indoor installation. It’s a durable solution for households with multiple hot-water demands, delivering fast and reliable on-demand hot water. While this unit emphasizes indoor performance, it remains a robust option for homes seeking solid efficiency and steady supply during peak usage.
Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater
Rinnai RX199iN offers flexible indoor/outdoor installation with Versa Vent and Smart Sense control, compatible with propane or natural gas. It supports up to 11.1 GPM, making it suitable for larger homes or higher simultaneous hot-water demands. The unit emphasizes energy efficiency with a high UEF rating, a quick flush feature, and an intuitive interface. WiFi control is available via a separate controller module (not included).
Buying Guide: Key Considerations for WiFi Gas Tankless Water Heaters
- Flow capacity and simultaneous uses: higher GPM allows more fixtures (showers, sinks, laundry) to run without temperature fluctuation. Match to your home’s typical peak load.
- Gas type and efficiency: natural gas vs propane impacts installation and fuel costs. Condensing models generally offer higher efficiency but may involve higher upfront costs.
- Outdoor vs indoor placement: outdoor units require weather protection and venting considerations; indoor units need proper ventilation and wall mounting.
- Connectivity and control: evaluate the reliability of WiFi/app control, supported platforms, and whether remote temperature management aligns with your household needs.
- Water temperature stability: advanced modulation and minimum-flow specs help maintain comfort during multi-fixture usage or low-water-pressure scenarios.
- Installation and maintenance: check serviceability, required clearances, and whether professional installation is recommended or required by local codes.
- Safety and certifications: CSA/UL ratings, CSA certification, and compliance with local safety standards are important for long-term reliability.