10 Best Tankless Water Heaters With WiFi in 2026: Smarter Hot Water for Every Home

Choosing the right tankless water heater with WiFi can make daily hot water more efficient, convenient, and easier to manage from your phone.

From compact electric models to high-output whole-home units, this roundup focuses on smart features, performance, and real-world fit.

Best 10 Tankless Water Heaters with Wifi Picks for 2026

Compact Whole-Home WiFi Electric Pick – 18kW Electric Tankless Water Heater 240V ETL Certified WiFi

If you want tankless water heaters with wifi for a smaller whole-home setup, this 18kW electric model is built around steady hot water and simple remote control. It’s designed for 2–3 bathroom homes in mild to moderate climates, with self-modulating output to help keep shower temperature stable.

Best For: Homes that want an electric, wall-mounted tankless unit with app-based temperature control and compact sizing.

Pros:

• WiFi remote control lets you adjust temperature without standing at the unit.
• Self-modulating technology helps maintain consistent water temperature and improve efficiency.
• Up to 4.3 GPM is suitable for showers and everyday household hot water.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires significant electrical capacity, including 150A household service recommendation.
• Needs 2 x 40A double-pole breakers and 2 x 8/2 AWG wiring.
• Best fit is limited to mild to moderate climates and smaller whole-home demand.

This is a practical pick if you already have the electrical infrastructure and want a compact, WiFi-enabled electric tankless heater with straightforward whole-home use.

Smart App-Controlled Gas Option – APUS Propane Tankless Water Heater

For buyers comparing tankless water heaters with wifi, this propane model stands out for app control plus high flow output. It combines a 140,000 BTU burner, a built-in booster pump, and Tuya app support to deliver on-demand hot water for whole-house use.

Best For: Households that want a propane tankless heater with WiFi app control, boosted flow, and indoor installation.

Pros:

• WiFi remote control works with the Tuya app for temperature changes and monitoring.
• Built-in booster pump can increase water flow up to 130%, reaching 6.8 GPM.
• Single-circulation and ECO features are designed to reduce cold-water wait time and save energy.
• Multiple safety protections include freeze and overheat protection.

Cons:

• Requires propane fuel and a 120V AC connection for operation.
• Ambient temperatures near or below 41°F require draining if unused for long periods.
• Indoor installation still means planning for standard gas appliance requirements.

Overall, this is a strong feature-rich choice if you want smart control, fast delivery, and enough flow for multiple fixtures at once.

High-Capacity WiFi Electric Upgrade – 36kW Electric Tankless Water Heater 240V ETL Certified WiFi

If you need tankless water heaters with wifi for a larger household, this 36kW electric model is built for higher output and remote temperature control. It’s designed to serve homes with 3–5 bathrooms in mild to moderate climates, while using self-modulating technology to help keep hot water consistent.

Best For: Larger homes that need a WiFi-enabled electric tankless heater with higher flow capacity.

Pros:

• WiFi remote control lets you manage temperature from your smartphone.
• Up to 8.7 GPM makes it the highest-flow electric option in this group.
• Self-modulating operation helps optimize energy use and maintain stable temperature.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires very heavy electrical service, with a 300A household recommendation.
• Needs 4 x 40A double-pole breakers and 4 x 8/2 AWG cables with ground.
• Installation demands careful planning due to size and power requirements.

This is the right direction if your electrical setup can handle it and you want a more capable WiFi electric unit for whole-house demand.

Premium WiFi Gas Whole-Home Choice – Rheem RTG Series 9.5 GPM Natural Gas Tankless Water Heater

For shoppers looking at tankless water heaters with wifi in a gas setup, this Rheem indoor model is aimed at larger households that need reliable on-demand hot water. It delivers up to 9.5 GPM, includes WiFi support, and is built for whole-home use with precision temperature control.

Best For: Large families and multi-bathroom homes that want a WiFi-enabled natural gas tankless heater.

Pros:

• WiFi enabled for connected control alongside the digital LED panel.
• High 9.5 GPM flow supports 3–4 simultaneous showers.
• 0.82 UEF and on-demand heating help reduce energy use versus storage tanks.
• Includes freeze protection, flame failure protection, and LeakGuard leak detection.

Cons:

• Professional installation is required for this indoor gas unit.
• Non-condensing design may not appeal to buyers seeking the highest-efficiency gas option.
• Larger whole-home capacity comes with a more involved installation setup.

This model is a strong pick if you want a premium natural gas unit with smart features, high flow, and a long warranty package.

High-Capacity Smart Home Pick – 27kW Tankless Water Heater Electric 240V WiFi

If you need one of the more powerful tankless water heaters with wifi for a larger home, this 27kW electric model is built for multi-point use and remote control. It offers up to 6.5 GPM, app-based temperature control, and smart monitoring, but it also has demanding electrical requirements, so it is best suited to homes that already have the capacity for a serious upgrade.

Best For: Whole-home buyers who want high output, app control, and a wall-mounted unit for 2–4 points of use.

Pros:

• Up to 6.5 GPM with stable temperature control for multiple fixtures.
• WiFi app control with temperature settings from 86°F to 140°F.
• Smart self-modulating design helps reduce energy use and standby waste.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires 200 amp household service recommended for installation.
• Needs 3 × 40 amp double-pole breakers and 3 sets of 8 AWG wiring.
• Not a simple plug-and-play choice; electrician consultation is advised.

This is a strong fit if you want a high-output smart heater and can meet the installation demands. The combination of WiFi control, compact wall mounting, and whole-home capacity makes it appealing, but the electrical setup is the key deciding factor.

Compact Whole-House Smart Choice – Westinghouse 24kW Tankless Water Heater

This Westinghouse model is a practical pick among tankless water heaters with wifi if you want compact size, app control, and a 24kW output for everyday household use. It supports remote temperature adjustment, works with Alexa and Google Home, and is designed to fit in tighter spaces like closets, apartments, and under-sink installations.

Best For: Buyers who want a compact electric heater with smart-home compatibility and strong flow for smaller homes or tight installs.

Pros:

• WiFi app control with Alexa and Google Home compatibility.
• Precise 1°F temperature adjustments from 86°F to 140°F.
• Compact 18.7 x 3.94 x 14.17 inch design saves floor space.
• ETL-certified with overheat, dry-fire, and leak protection.

Cons:

• Requires 240V / 100A service and professional installation is recommended.
• Flow rate varies with inlet temperature and usage conditions.
• Needs a minimum 0.5 GPM to start.

For shoppers who want a smarter, space-saving electric tankless heater, this Westinghouse unit checks a lot of boxes. Its app-based controls and compact footprint are useful, but the electrical requirements and flow limits should be verified before buying.

Point-of-Use Smart Utility Pick – 9kW Electric Tankless Water Heater 240V

For smaller jobs, this 9kW option shows why tankless water heaters with wifi can be useful even at point-of-use scale. It is designed for sinks, office breakrooms, and low-flow applications, with app control, temperature monitoring, and a compact wall-mounted build that makes it easy to place where space is limited.

Best For: Small sinks, booster use, and low-flow spaces that need remote temperature control.

Pros:

• WiFi app control with temperature settings from 86°F to 140°F.
• Very compact wall-mounted size for tight spaces.
• Up to 2.2 GPM with ±1°F temperature control for steady use.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Only suited to low-flow or point-of-use applications.
• Requires hardwired installation with 1 × 40A double-pole breaker.
• Not intended for high-demand whole-home use.

This is the most practical pick if you want smart control without paying for more output than you need. Its small footprint and stable temperature control are the main advantages, while the limited flow rate keeps it focused on lighter-duty tasks.

Compact Smart Sink Heater – Westinghouse 8kW Smart WiFi Mini

If you’re comparing tankless water heaters with wifi for a sink or vanity, this 8kW Westinghouse model is built for exactly that kind of point-of-use setup. It delivers instant hot water for handwashing and dish rinsing, while the app and voice control make temperature changes simple from anywhere.

Best For: Small sinks, vanities, and other single-point uses where compact size and smart control matter.

Pros:

• Smart WiFi control with Alexa and Google Home compatibility
• Compact under-sink design with 1/2" NPT connections
• 80°F to 130°F temperature adjustment via app or voice
• Safety features include anti-scald, dry-fire, low-flow, and voltage protection

Cons:

• Not intended for showers
• Requires hard wiring and a dedicated 40A circuit
• Best suited to sink use rather than whole-home demand

This is a practical pick if you want a small, energy-saving tankless unit with WiFi control for a focused application. Its compact footprint and safety protections make it a strong fit for tight spaces and everyday sink tasks.

Higher-Output Smart Home Pick – Westinghouse 14kW WiFi 240V

Among tankless water heaters with wifi, this 14kW Westinghouse model stands out for faster heating and broader everyday use. It’s designed to deliver hot water in about 3 seconds, with app-based control, voice compatibility, and temperature memory for a smoother routine after outages.

Best For: Homes or apartments that want a compact wall-mounted heater with smart controls and stronger output.

Pros:

• Smart WiFi control plus Alexa and Google Home support
• 3-second hot water and up to 3.4 GPM under stated conditions
• Temperature memory restores the last preset after power outages
• ETL certified with 4-layer protection and IPX4 rating

Cons:

• Needs a dedicated 60A double-pole breaker and 6 AWG wire
• Best performance depends on inlet temperature and flow conditions
• Still a point-of-use style unit, not a floor-standing heater

This is a strong choice if you want a WiFi-enabled tankless unit with more headroom than a small sink heater. The compact wall mount, safety protections, and temperature memory make it appealing for modern household installs.

Smart Shower-Ready Option – Westinghouse 11kW WiFi 240V

If you’re shopping tankless water heaters with wifi for a single shower or other one-point setup, this 11kW Westinghouse model is a balanced middle ground. It offers app and voice control, quick 3-second heating, and a compact wall-mounted design that keeps installation off the floor.

Best For: Single-point uses like a shower or bathroom setup that benefit from smart control and compact sizing.

Pros:

• WiFi control with Alexa and Google Home compatibility
• 3-second hot water and 2.6 GPM under stated conditions
• Temperature memory brings back the last setting after outages
• ETL certified with 4-layer protection and IPX4 rating

Cons:

• Requires a dedicated 60A double-pole breaker and 8 AWG wire
• Output is aimed at a single water point, not multiple fixtures
• Best suited to residential point-of-use demand

This model makes sense when you want WiFi convenience without stepping up to the higher-output 14kW version. Its shower-friendly flow rating and safety features make it a practical middle-tier option for compact installations.

How We Picked the Best Tankless Water Heaters with Wifi

We focused on units that combine reliable hot water delivery with useful smart controls, including app-based monitoring, temperature adjustment, and status alerts where available. Capacity, electrical or fuel requirements, certification, and whole-home suitability all mattered.

We also favored models that make sense for different household sizes, from small apartments and point-of-use installs to larger homes that need more flow and recovery.

Quick Comparison

In broad terms, the lineup splits into three groups: smaller 8kW to 11kW electric units for lighter demand, midrange 14kW to 27kW electric models for more flexible residential use, and higher-output 36kW electric or gas units for larger households. If you need the strongest flow rates, gas models typically offer more headroom; if you want simpler installation in an all-electric home, electric units are often the better match.

Key Buying Factors for Tankless Water Heaters with Wifi

Capacity and Flow Rate

Look at gallons per minute and, for electric models, kilowatt rating. The right size depends on how many showers, sinks, and appliances may run at once, plus your incoming water temperature.

Power or Fuel Requirements

Electric models usually need substantial dedicated circuits, especially above 18kW. Gas models may offer stronger output, but they require venting and proper gas supply.

WiFi Features That Actually Matter

Useful smart functions include remote temperature changes, energy-use monitoring, fault alerts, and scheduling. Basic WiFi control is helpful, but better apps make daily ownership easier.

Installation Fit

Check indoor versus outdoor use, clearances, venting needs, and whether the unit is intended for whole-home or point-of-use coverage. A great feature set does not help if the installation is mismatched to your home.

Who Should Buy Which Tankless Water Heaters with Wifi?

If you want the simplest smart upgrade for a small space, a lower-kW electric model can be enough for a bathroom, guest suite, or sink-heavy area. Medium-output electric units are a better fit for most households that want a balance of convenience and whole-home coverage. Larger homes or families with simultaneous hot-water demand should lean toward high-output electric or gas models, especially if consistent flow is the top priority.

For buyers comparing Tankless Water Heaters with Wifi, the best choice is usually the one that matches your electrical setup, home size, and everyday hot-water habits first, then adds the smart features you will actually use.