10 Best Tankless Water Heaters With WiFi for 2026: Smart Whole-Home Picks for Faster Hot Water

Smart hot water starts with the right setup. If you want faster control, better efficiency tracking, and a more modern home water-heating experience, tankless water heaters with WiFi are worth a close look.

This roundup highlights 10 options across gas and electric models so you can compare performance, capacity, and smart features without the guesswork.

Best 10 Tankless Water Heaters with Wifi Picks for 2026

Smart Whole-Home Gas Pick – MIZUDO 120,000 BTU Natural Gas Tankless Water Heater

If you want tankless water heaters with wifi for a larger home, this MIZUDO natural gas model is built for steady whole-house hot water with remote app control. It combines 120,000 BTU output, up to 5.1 GPM flow, and indoor/outdoor convertible installation flexibility, so it can fit a range of layouts.

Best For: Families that want high-capacity natural gas hot water with app-based control and flexible installation.

Pros:

• WiFi and app control for remote temperature changes, usage monitoring, and maintenance alerts
• High 120,000 BTU output and 5.1 GPM flow rate for multiple fixtures
• Temperature stability within 1°F for more consistent showers
• CSA certified with freeze, dry-burn, flame-failure, and exhaust blockage protection

Cons:

• Indoor installation requires a 3″ OD vent pipe system
• Outdoor conversion needs a separately purchased accessory kit
• Natural gas setup may not suit homes without gas service

Overall, this is a strong pick if you need a smart gas unit that prioritizes output, safety, and installation flexibility. The WiFi features are useful, but the real advantage is its capacity for bigger households.

Smart Electric Convenience Pick – Westinghouse 14kW Tankless Water Heater

For shoppers comparing tankless water heaters with wifi in a compact electric format, this Westinghouse 14kW model focuses on quick heating, smart control, and easy wall-mount installation. It delivers instant hot water in about 3 seconds and supports app, voice, and temperature memory features for day-to-day convenience.

Best For: Apartments, smaller homes, and smart-home users who want electric on-demand hot water with simple remote control.

Pros:

• WiFi, app, Alexa, and Google Home compatibility
• 3-second heating with up to 3.4 GPM under stated conditions
• Compact wall-mount design saves floor space
• ETL certified with 4-layer protection and IPX4 rating

Cons:

• Requires a dedicated 60A double-pole breaker and 6 AWG wire
• Best performance is limited by incoming water temperature and demand
• Not intended for users without suitable 240V electrical service

This model stands out if you want a smart electric heater with modern controls and a small footprint. Its installation requirements are important, but the tradeoff is fast hot water in a highly compact package.

Smart Propane Performance Pick – MIZUDO 120,000 BTU Propane Tankless Water Heater

If propane is your fuel of choice, this is one of the tankless water heaters with wifi designed to bring smart control to a high-output setup. The MIZUDO propane model offers app-based temperature management, 120,000 BTU performance, and indoor/outdoor convertible installation support.

Best For: Homes using propane that want remote control, strong flow, and flexible placement options.

Pros:

• WiFi and app control for remote adjustments and maintenance notifications
• 120,000 BTU output with up to 5.1 GPM flow rate
• Temperature stability within 1°F for more consistent showers
• CSA certified with freeze, dry-burn, flame-failure, and blockage protections

Cons:

• Indoor use requires a 3″ OD vent pipe system
• Outdoor conversion requires a separate vent cap kit
• Propane fuel may not be convenient for every household

This is a practical option if you need a propane unit with smart controls and enough capacity for multiple fixtures. It balances power, safety, and flexibility well, especially for homes already set up for propane.

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

Among tankless water heaters with wifi, this 18kW electric model is aimed at buyers who want compact whole-home coverage and remote temperature control. It uses self-modulating power, offers up to 4.3 GPM, and is designed for residential showers and everyday hot water use.

Best For: Mild-to-moderate climate homes that need a space-saving electric heater with remote WiFi control.

Pros:

• Remote WiFi control for adjusting temperature without standing at the unit
• Self-modulating design helps maintain stable temperature and improve efficiency
• Compact wall-mounted form factor saves space
• ETL certified with leakage, overheat, and dry-fire protection

Cons:

• Requires a 150A household service recommendation
• Needs two 40A double-pole breakers and 8/2 AWG wiring
• Maximum output of 4.3 GPM may not fit higher-demand households

This model makes sense if you want a smaller electric unit with smart convenience and efficient operation. Just be sure your electrical setup can support the installation requirements before buying.

Smart Whole-Home Pick – Westinghouse 24kW WiFi

Among tankless water heaters with wifi, this Westinghouse 24kW model is a strong fit for households that want remote temperature control and enough output for everyday whole-home use. It offers instant hot water, a compact wall-mounted design, and app plus voice control through Alexa and Google Home, making it a practical upgrade for space-conscious homes.

Best For: Apartments, homes, cabins, and small households that want smart Wi-Fi control with whole-home hot water.

Pros:

• Smart Wi-Fi control with app access and voice compatibility for Alexa and Google Home
• Up to 5.55 GPM with a low 0.79 GPM starting flow rate
• Compact wall-mounted design saves floor space
• ETL certified and rated for 86140b0F temperature range

Cons:

• Requires hard wiring and a 240V setup with 3 x 40A double-pole breakers
• Installation requirements may be demanding for older electrical panels

This model balances smart features and everyday capacity well, but the electrical requirements are the main factor to verify before buying. If your panel can support it, it delivers a convenient Wi-Fi-enabled on-demand hot water setup.

High-Capacity WiFi Option – WINTEMP 36kW Smart Heater

If you need tankless water heaters with wifi for a larger household, this 36kW WINTEMP unit is built for higher-demand homes and steady hot water delivery. It combines built-in Wi-Fi remote control, self-modulating output, and a compact wall-mounted form factor, with a maximum flow rate up to 8.7 GPM for multi-bathroom use in mild to moderate climates.

Best For: Larger homes with 3e235 bathrooms that want high output and smartphone control.

Pros:

• Built-in Wi-Fi remote control for smartphone temperature adjustment
• High output up to 8.7 GPM for whole-house hot water
• Self-modulating technology helps maintain stable temperature and improve efficiency
• ETL certified with leak, overheat, and dry-fire protection

Cons:

• Requires a 300A household electrical service recommendation
• Needs 4 x 40A double-pole breakers and 4 x 8/2 AWG cables
• Installation is best left to a licensed electrician

This is the most capacity-focused option in the group, but it also has the most demanding electrical setup. It makes the most sense when you want Wi-Fi convenience and high flow for a larger home.

Compact Smart Choice – Westinghouse 18kW WiFi

This Westinghouse 18kW model is a compact entry in tankless water heaters with wifi, offering app-based control, Alexa and Google Home compatibility, and a slim profile that fits tight spaces. With a 0.5 GPM start and up to 4.2 GPM depending on inlet temperature, it’s a sensible choice when you want efficient on-demand hot water without committing to a larger unit.

Best For: Small homes, apartments, under-sink installs, closets, and RVs needing a compact Wi-Fi heater.

Pros:

• Wi-Fi app control with Alexa and Google Home compatibility
• Compact 18.7 x 3.94 x 14.17-inch design for tight spaces
• 1-degree temperature adjustment from 86b0140b0F
• ETL certified with overheat, dry-fire, and leak protection

Cons:

• Lower capacity than the larger 24kW and 36kW options
• Flow rate depends heavily on inlet water temperature

For smaller installations, this model stands out because it blends smart control with a very slim footprint. It is the most space-efficient pick here, though buyers should match its output to the size of the home and expected hot water demand.

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

If you want tankless water heaters with wifi for a larger home, this 27kW model is built around higher output and app-based control. It supports 2–4 points of use, includes smart self-modulating operation, and offers remote temperature adjustment plus usage tracking through compatible smart home and Tuya Smart apps.

Best For: Larger households that need a higher-capacity electric tankless unit with remote WiFi control.

Pros:

• Up to 6.5 GPM of stable hot water output.
• Smart WiFi control with temperature range from 86°F to 140°F.
• Self-modulating design helps reduce energy use and supports true zero-energy standby.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires a 200 amp household service recommendation, so installation planning is important.
• Needs 3 × 40 amp double-pole breakers and 3 sets of 8 AWG wiring.
• Best suited to homes that can support its higher electrical demand.

This is the strongest choice in the group for buyers who prioritize capacity and app control over easy installation. If your electrical setup matches the requirements, it offers a solid balance of output, efficiency, and safety features.

Compact Smart Single-Point Pick – Westinghouse 11kW Tankless Water Heater Electric 240V Wifi

Among tankless water heaters with wifi, this Westinghouse 11kW unit is a practical fit for single-point use where compact size and quick heat matter. It delivers hot water in about 3 seconds, supports app and voice control, and is designed for a dedicated 60A double-pole breaker with 8 AWG wire.

Best For: Apartments, cabins, or a single shower point where quick hot water and smart control are priorities.

Pros:

• 3-second instant heating with 98% thermal efficiency.
• WiFi control plus Alexa and Google Home compatibility.
• Temperature memory restores the last preset after a power outage.
• ETL certified with 4-layer protection and IPX4 rating.

Cons:

• Lower flow capacity makes it better for a single water point than multiple fixtures.
• Requires a dedicated 60A double-pole breaker and 8 AWG wire.
• 1/2″ NPT connections may limit fit if your plumbing setup differs.

This model stands out for buyers who want a compact electric tankless heater with app control and fast response. It looks especially appealing when you need a simple, space-saving solution for one bathroom or similar use.

Mid-Range Smart Pick – 18kW Tankless Water Heater Electric 240V WiFi

If you’re comparing tankless water heaters with wifi for a smaller household, this 18kW option lands in a useful middle ground. It supports 2–3 simultaneous points of use, offers remote temperature control through compatible smart home and Tuya Smart apps, and uses smart self-modulating technology to manage energy use automatically.

Best For: Smaller homes that want app control and enough capacity for a few fixtures at once.

Pros:

• Up to 4.3 GPM of stable hot water output.
• WiFi app control with 86°F to 140°F temperature settings.
• Compact wall-mounted design saves space.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires 150 amp household service recommendation, so electrical capacity matters.
• Needs 2 × 40 amp double-pole breakers and 2 sets of 8 AWG wiring.
• Not as high-output as the 27kW model for larger households.

This is a sensible pick if you want WiFi control without stepping all the way up to a larger-capacity unit. It offers a strong mix of efficiency, safety, and space-saving design for modest household demands.

How We Picked These Tankless Water Heaters with Wifi

We focused on the factors that matter most to buyers: heating capacity, fuel type, smart connectivity, installation fit, and whole-home usability. Models were included for a range of household sizes and electrical or gas setups, with attention to ETL certification and practical app-based control.

Quick Comparison

The lineup splits into two main categories: gas units that typically deliver higher flow rates for larger households, and electric units that are often simpler to install in the right electrical environment. If you need strong multi-fixture performance, higher-BTU gas models are usually the better fit. If you want a cleaner installation and your home has sufficient electrical capacity, electric units may be the more straightforward choice.

Key Buying Factors for Tankless Water Heaters with Wifi

Capacity and Flow Rate

Look at gallons per minute and heater output together. A higher GPM rating helps support more simultaneous uses, but only when paired with realistic inlet water temperatures and household demand.

Fuel Type and Power Requirements

Gas models can be ideal for larger homes, while electric units depend heavily on your electrical panel and breaker availability. Before buying, confirm that your home can support the required voltage and amperage.

WiFi Features and App Control

WiFi is most useful when it gives you temperature adjustments, alerts, and usage visibility from your phone. The best Tankless Water Heaters with Wifi make everyday control easier without adding unnecessary complexity.

Installation and Certifications

Check whether the unit is intended for indoor or outdoor use, and make sure it carries the right safety certification for your market. Professional installation is often the safest route, especially for higher-power electric or gas systems.

Who Should Buy Which Tankless Water Heaters with Wifi?

Choose a higher-output gas model if you want stronger whole-home performance and have the gas line and venting to support it. Choose a mid- to high-kW electric model if you want compact, efficient point-to-whole-home heating and your electrical system can handle the load. Smaller households or lower-demand setups may be well served by lower-kW units, while larger families should prioritize capacity first and smart features second.

If your main goal is convenience, energy awareness, and easy temperature control, Tankless Water Heaters with Wifi offer a practical upgrade. If your goal is maximum output, make sure the smart features do not distract from the most important spec: enough hot water for your actual usage.