10 Best Tankless Water Heaters With WiFi for 2026: Smart Hot Water Picks for Every Home

Looking for tankless water heaters with WiFi that make hot water more efficient, more convenient, and easier to manage? The best models let you adjust settings, track performance, and get more control from your phone.

Below, we’ve rounded up 10 strong options for 2026, including electric and gas picks for different home sizes, budgets, and installation needs.

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 gas model is built to cover more than one hot water task at once. It pairs a 120,000 BTU output with app-based control, making it a practical choice when you want remote temperature adjustments and stable performance for everyday use.

Best For: Larger households that want WiFi/app control, flexible installation, and strong flow for multiple fixtures.

Pros:

• WiFi and app control let you adjust temperature and monitor usage remotely.
• Up to 5.1 GPM and 120,000 BTU support multi-fixture demand.
• Indoor or outdoor convertible installation adds flexibility.
• CSA certified with freeze, dry-burn, flame failure, and exhaust blockage protections.

Cons:

• Outdoor conversion kit and indoor vent pipe are required separately.
• Best suited to natural gas homes, not electric setups.
• Large-home performance may be more than small households need.

Overall, this is a strong pick if your priority is smart control plus enough output for busier homes. The stability claim and broad installation options make it especially appealing when flexibility matters as much as convenience.

Compact Electric Smart Pick – 18kW Electric Tankless Water Heater 240V ETL Certified WiFi

Among tankless water heaters with wifi, this 18kW electric model is a good fit when you want a compact unit with remote control and steady shower performance. It is designed for homes that can support the electrical load and need an on-demand solution without giving up space.

Best For: Homes with the required electrical service that want a compact, WiFi-enabled electric tankless heater for everyday shower use.

Pros:

• WiFi remote control makes temperature adjustments more convenient.
• Self-modulating technology helps keep water temperature stable and improve efficiency.
• Compact wall-mounted design saves substantial space.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires a substantial electrical setup, including 150A household service recommendation.
• Maximum flow rate of 4.3 GPM is better for smaller whole-home demand.
• Installation should be reviewed by a qualified electrician before purchase.

This unit makes sense if you value a smaller footprint and smart control more than maximum output. Just make sure your home’s electrical system matches the installation requirements before you commit.

High-Output Outdoor Gas Pick – Rheem RTG Series 9.5 GPM WiFi Enabled

If you are comparing tankless water heaters with wifi for a busy household, this Rheem outdoor gas unit stands out for its high flow rate and whole-home performance. It is designed to deliver continuous hot water for multiple showers while keeping venting simple thanks to outdoor installation.

Best For: Large families and multi-bathroom homes that want high hot-water output with WiFi-enabled control.

Pros:

• 9.5 GPM flow rate supports 3-4 simultaneous showers.
• WiFi enabled with digital LED temperature control and ±1°F adjustment.
• Outdoor installation eliminates venting requirements.
• High efficiency design and freeze/flame failure protections add value.

Cons:

• Outdoor-only installation may not suit every layout.
• Professional installation is required.
• Best performance depends on natural gas availability and proper setup.

For shoppers who want strong output first and smart control second, this Rheem model is a compelling option. It combines high capacity with a streamlined outdoor design, which can simplify planning for larger homes.

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

For buyers looking at tankless water heaters with wifi and needing more electric output, this 36kW WINTEMP unit is aimed at larger homes with the proper power supply. It offers smartphone control, self-modulating operation, and enough capacity to serve busy daily routines when the installation requirements are met.

Best For: Larger homes with the required electrical service that want a WiFi-enabled electric tankless heater and higher flow capacity.

Pros:

• Up to 8.7 GPM supports larger household demand.
• Built-in WiFi remote control lets you adjust temperature from your phone.
• Self-modulating technology helps optimize energy use and maintain steady hot water.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires a 300A household electrical service recommendation.
• Needs four 40A double-pole breakers and four 8/2 AWG cables.
• Installation demands are significant compared with smaller electric units.

This model is best viewed as a serious capacity upgrade for homes that can support it. If your electrical system is ready, it offers a strong blend of smart control, space savings, and high output.

Whole-Home Gas Upgrade – Rheem 9.5 GPM WiFi Indoor Tankless

For shoppers comparing tankless water heaters with wifi, this Rheem natural gas model is built for whole-home use, steady hot water, and remote control convenience. Its 9.5 GPM output and 199,900 BTU performance are aimed at larger households that want multiple fixtures running without the usual tank limitations.

Best For: Large families and multi-bathroom homes needing a WiFi-enabled gas unit for 3-4 simultaneous hot water points.

Pros:

• 9.5 GPM output supports up to 3-4 simultaneous showers.
• WiFi enabled with digital LED temperature control and ±1°F adjustments.
• 0.82 UEF non-condensing design can save up to 34% vs. 50-gallon electric tank heaters.
• Indoor direct-vent installation with freeze and flame-failure protection.

Cons:

• Professional installation is required.
• Natural gas setup limits it to homes with the right fuel supply.

This is a strong pick if you want a high-capacity gas heater with smart control and whole-house coverage. The long warranty coverage also adds appeal for buyers looking for a more permanent tank replacement.

High-Power Electric Control – 27kW WiFi Tankless Heater

Among tankless water heaters with wifi, this 27kW electric model is designed for buyers who want app control, strong flow, and a compact wall-mounted footprint. It delivers up to 6.5 GPM and uses smart self-modulating tech to adjust output based on demand, making it a practical fit for several points of use.

Best For: Homes with the required electrical setup that want a WiFi-controlled electric tankless heater for 2-4 points of use.

Pros:

• Up to 6.5 GPM with stable hot water delivery.
• WiFi app control works with Smart Home and Tuya Smart.
• Smart self-modulating design helps reduce energy use and supports zero-energy standby.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Installation is demanding and requires a 200A household service recommendation.
• Needs 3 × 40A double-pole breakers and specific 8 AWG wiring.

This unit makes the most sense for buyers who already have the electrical capacity and want app-based temperature monitoring and control. It offers good versatility, but the installation requirements are an important part of the buying decision.

Compact Sink Solution – Westinghouse 8kW Smart WiFi Mini Heater

If you’re shopping tankless water heaters with wifi for a sink or vanity, this Westinghouse 8kW model is aimed at small-space, point-of-use applications. It provides instant hot water for handwashing and dish rinsing, while the smart WiFi controls make remote temperature adjustment simple.

Best For: Kitchens, sinks, and vanities where compact size and WiFi control matter more than shower-level output.

Pros:

• Compact 6.9″ x 8.1″ x 2.5″ design fits tight spaces.
• Smart WiFi control with app or voice compatibility through Alexa and Google Home.
• Optimized for sinks and single-faucet use with instant hot water.
• Safety features include IPX4 waterproofing, anti-scald tech, and dry-fire prevention.

Cons:

• Not for showers.
• 8kW output is meant for smaller-demand applications rather than whole-home use.

This is a focused choice for point-of-use heating where cabinet space is limited and convenience is the priority. It is not a general replacement for a larger household unit, but it fits the right job well.

Smart Value Pick – Electrolux 14kW Wifi Tankless Water Heater

If you’re comparing tankless water heaters with wifi for a small home or apartment, this Electrolux 14kW model stands out for fast heat-up, app control, and scale resistance. It is designed for 1–2 fixtures and can reach up to 3.4 GPM, so it fits practical everyday hot-water needs without taking up much space.

Best For: Small households that want WiFi control, compact installation, and hard-water resistance.

Pros:

• Built-in WiFi with smartphone temperature control from 80°F to 140°F
• Alexa voice compatibility for easier adjustment
• Scale inhibitor helps reduce mineral buildup and maintenance
• Compact wall-mounted design saves significant space

Cons:

• Requires a 240V/60A breaker and 6 AWG wiring
• Best suited to 1–2 fixtures rather than larger homes
• Installation depends on having adequate panel capacity

This is a strong pick if you want smart controls plus efficiency in a modest-capacity unit. The 3-second heating claim, self-modulating operation, and long-life scale protection make it a practical choice where space and water quality are both concerns.

Compact Smart Choice – Westinghouse 11kW Wifi Tankless Heater

Among tankless water heaters with wifi, this Westinghouse 11kW model is a good fit when you want quick hot water for a single point and simple smart-home control. It heats in about 3 seconds, supports Alexa and Google Home, and includes temperature memory so your last setting comes back after a power outage.

Best For: Single-point use in apartments, bathrooms, or small spaces where smart controls matter.

Pros:

• WiFi app control plus Alexa and Google Home compatibility
• Temperature memory restores the last preset after outages
• 3-second heating and 98% thermal efficiency
• Compact wall-mount design with zero floor space use

Cons:

• 11kW output is better for a single water point than multiple fixtures
• Requires a dedicated 60A double-pole breaker and 8 AWG wire
• May not suit homes needing higher simultaneous flow

This model focuses on convenience and efficiency rather than maximum capacity. If you want a smart, bathroom-friendly unit with low-profile installation and easy remote adjustment, it is a well-matched option.

Higher Output Smart Pick – Westinghouse 14kW Wifi Tankless Heater

If you need more capacity from tankless water heaters with wifi, this Westinghouse 14kW version offers the same smart controls with stronger output. It reaches up to 3.4 GPM, supports two water points simultaneously under stated conditions, and adds app-based control, voice compatibility, and temperature memory for easy daily use.

Best For: Small households that want WiFi features plus more flow for two fixtures.

Pros:

• WiFi app control with Alexa and Google Home compatibility
• Up to 3.4 GPM and support for two water points simultaneously
• Temperature memory brings back your last preset after outages
• ETL certification, 4-layer protection, and IPX4 rating

Cons:

• Needs a dedicated 60A double-pole breaker and 6 AWG wire
• Still best suited to compact residential use rather than large homes
• Output depends on inlet and outlet temperature conditions

This is the better fit if the 11kW class feels too limited and you want a bit more headroom. It keeps the smart-home convenience of the lineup while adding stronger flow for everyday multi-point use in a compact residence.

How We Picked These Tankless Water Heaters with Wifi

We focused on units that combine smart connectivity with practical hot water performance. That means checking output capacity, fuel type, efficiency, installation flexibility, and the usefulness of the WiFi/app features. We also favored models from recognizable brands or certified units with clear specs.

Because homes vary widely, our list includes compact electric heaters for point-of-use or smaller households, higher-output electric units for larger demand, and natural gas systems for bigger hot water loads.

Quick Comparison

In general, electric Tankless Water Heaters with Wifi are easier to place in smaller spaces and are often a better fit where gas is unavailable. Natural gas models usually deliver higher flow rates and work better for whole-home demand, especially when multiple showers or appliances may run at once.

For most buyers, the best choice comes down to electrical capacity or gas availability, along with how much hot water you need at peak times.

Key Buying Factors for Tankless Water Heaters with Wifi

Flow Rate and Household Demand

Check gallons per minute, not just wattage or BTUs. A 3 to 5 GPM electric unit may suit one bathroom or a small apartment, while larger homes often need higher-capacity electric systems or a powerful gas model.

Fuel Type and Installation

Gas units can support higher output, but they require venting and a gas line with sufficient supply. Electric units are often simpler to install, though larger models may need substantial electrical upgrades and dedicated circuits.

WiFi Features That Actually Matter

Look for app controls that provide real value, such as temperature adjustment, status alerts, and usage tracking. WiFi should add convenience, not just be a marketing checkbox.

Efficiency, Safety, and Certifications

ETL certification, high-efficiency design, and built-in protections are worth prioritizing. These features help support safer operation and may improve long-term reliability.

Who Should Buy Which Tankless Water Heaters with Wifi?

If you want the highest hot water output for a larger household, a natural gas option is usually the strongest fit. If you want a cleaner install or have no gas access, an electric model may be the better choice. Smaller homes, condos, and point-of-use applications can benefit from lower-kW units, while bigger households should focus on higher-kW electric or high-BTU gas models.

In short, the best Tankless Water Heaters with Wifi are the ones that match your fuel setup, your hot water demand, and the smart features you’ll actually use.