10 Best Tankless Water Heaters With Wi‑Fi in 2026 for Smarter Hot Water Control

Tankless water heaters with Wi‑Fi make it easier to monitor temperatures, adjust settings, and manage hot-water use from a phone. The right model can also save space and provide continuous hot water, but performance depends on fuel type, flow rate, electrical capacity, and installation requirements.

We compared 10 gas and electric options across output, smart controls, installation flexibility, and likely use cases to help you choose a heater that matches your home and hot-water demand.

Best 10 Tankless Water Heaters with Wifi Picks for 2026

Flexible Gas Pick – MIZUDO 120,000 BTU WiFi Tankless Water Heater

For shoppers comparing tankless water heaters with wifi, the MIZUDO combines app-based control with flexible natural-gas installation. Its 120,000 BTU output and 5.1 GPM rating are aimed at homes using multiple fixtures, while the unit can be configured for indoor or outdoor installation with the required accessories.

Best For: Families wanting a WiFi-enabled gas heater for two to four outlets and flexible placement options.

Pros:

• WiFi app supports temperature adjustment, energy monitoring, and maintenance notifications.
• 5.1 GPM flow and 120,000 BTU output can support simultaneous use of multiple bathrooms.
• Indoor or outdoor installation is possible with the appropriate accessory kit and venting components.
• Includes freeze, dry-burn, flame-failure, and exhaust-blockage protections.

Cons:

• Natural-gas installation requires specific venting or an outdoor conversion kit, purchased separately.
• Professional gas and vent installation may be needed.

The MIZUDO is a versatile choice when smart controls and installation flexibility matter. Its 2-year full-unit warranty and 5-year heat-exchanger coverage add useful ownership support.

High-Capacity Gas Pick – Rinnai RX199iN Smart Sense Tankless Water Heater

The Rinnai RX199iN is a high-output option among tankless water heaters with wifi, although WiFi control requires the separately sold Controlr module. It delivers up to 11.1 GPM, supports natural gas or propane, and can be installed indoors or outdoors with the appropriate venting setup.

Best For: Larger households needing high simultaneous flow and gas-fuel flexibility.

Pros:

• Up to 11.1 GPM can support as many as seven fixtures at once.
• Smart Sense gas control supports natural gas or propane.
• Condensing design lists a .98 UEF and includes a Quick Flush feature.
• Compact wall-mounted form saves space compared with a storage tank.

Cons:

• WiFi control is not included and requires the Controlr module.
• Professional installation is recommended.
• Outdoor installation requires the RX-OVC vent cap.

Choose this Rinnai when capacity is the priority. Its strong flow rating and fuel flexibility are compelling, but the added WiFi module and professional installation should be included in the budget.

Smart Electric Whole-Home Pick – Westinghouse 24kW WiFi Tankless Water Heater

This Westinghouse model is a practical electric entry in the tankless water heaters with wifi category. Its 24kW system provides up to 5.55 GPM, while app connectivity and Alexa or Google Home compatibility let users adjust temperature and monitor usage remotely.

Best For: Apartments and homes with suitable 240V electrical service that want voice-enabled water-heater control.

Pros:

• WiFi works with an app plus Alexa and Google Home voice controls.
• Up to 5.55 GPM provides continuous on-demand hot water.
• Compact 17-by-13-by-4.3-inch wall-mounted design takes little space.
• ETL certified and supports an adjustable 86–140°F temperature range.

Cons:

• Requires 240V hardwiring, three 40A double-pole breakers, and three 8 AWG wires.
• The stated 100A current requirement may exceed the capacity of some homes.
• Electrical installation should be evaluated before purchase.

The Westinghouse stands out for smart-home integration and a slim form factor. Confirm panel capacity and wiring requirements first, since its substantial electrical demand is a key installation consideration.

Compact Electric Value Pick – WINTEMP 18kW WiFi Tankless Water Heater

The WINTEMP WN18 offers WiFi control and self-modulating performance in a compact electric package. Rated for up to 4.3 GPM, it is positioned for showers and everyday household use, but buyers should verify the electrical service and breaker requirements before choosing it for whole-home operation.

Best For: Two- to three-bathroom homes in mild to moderate climates with compatible 240V electrical service.

Pros:

• Remote WiFi control allows temperature adjustments away from the unit.
• Self-modulating operation adjusts power based on flow, set temperature, and incoming water temperature.
• Compact 11.1-by-19.2-by-4-inch wall-mounted design saves space.
• Includes leakage, overheat, and dry-fire protections and carries ETL certification.

Cons:

• Requires two 40A double-pole breakers and 2 x 8/2 AWG wiring.
• A 150A household service is recommended, which may limit compatibility.
• Its 4.3 GPM rating is lower than higher-capacity whole-home models.

This WINTEMP is appealing when compact size, WiFi access, and power modulation matter more than maximum flow. Have a qualified electrician confirm the installation requirements before ordering.

Best Compact Smart Pick – 11kW WiFi Point-of-Use Heater

For shoppers comparing tankless water heaters with wifi, this 11kW Westinghouse model is a compact point-of-use option with app and voice control. Its 2.6 GPM maximum flow at specified inlet conditions makes it best suited to a single shower or fixture rather than broad simultaneous household demand.

Best For: Apartments, cabins, bathrooms, and single-point hot-water applications where compact wall mounting and smart controls matter.

Pros:

• Wi-Fi, Alexa, and Google Home compatibility with temperature memory after power outages.
• Compact wall-mounted design with no floor-space requirement.
• ETL certification, IPX4 rating, and multiple protections including leakage, overheat, dry-fire, and over-voltage protection.
• 98% thermal efficiency and approximately three-second heating under the stated conditions.

Cons:

• Requires a dedicated 60A double-pole breaker and 8 AWG wire at 240V.
• Maximum 2.6 GPM output is intended primarily for one point of use.
• Requires periodic inlet-filter and rotor cleaning to manage sediment and scale.

This is a sensible choice when smart-home integration and a small footprint outweigh the need for whole-house capacity. Confirm electrical requirements and expected inlet-water conditions before purchase.

Best Whole-House Capacity – 27kW Self-Modulating WiFi Heater

Among tankless water heaters with wifi, this 27kW WINTEMP unit stands out for its claimed 6.5 GPM output and self-modulating control. It is designed for continuous whole-house hot water, but its substantial electrical demand makes an installation review essential before ordering.

Best For: Homes with two to three bathrooms in mild to moderate climates that need higher-capacity continuous hot water.

Pros:

• Up to 6.5 GPM output for showers and everyday household use.
• Self-modulating operation adjusts power based on flow, incoming temperature, and the selected temperature.
• Remote Wi-Fi control, LED display, child lock, and a compact wall-mounted form.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires three 40A double-pole breakers and three 8/2 AWG wire runs.
• The listing recommends substantial household service, so electrical upgrades may be necessary.
• Professional electrician consultation is important because the unit can draw up to 113A.

The WN27 offers the strongest stated flow capacity in this group, making it the most appropriate option for larger hot-water demands. Its installation requirements are correspondingly demanding, so verify panel capacity and local conditions first.

Best Balanced Home Option – 18kW Copper-Element WiFi Heater

This Westinghouse 18kW model is one of the more versatile tankless water heaters with wifi, combining whole-house positioning with a 4.2 GPM maximum flow under warm inlet conditions. Its copper heating elements, digital display, and scale inhibitor add practical features, though buyers should confirm the required 75A electrical capacity.

Best For: Small homes, apartments, RVs, and tight installations needing smart temperature control and moderate hot-water capacity.

Pros:

• Wi-Fi app control with Alexa and Google Assistant compatibility.
• Digital LED display and temperature adjustment from 86°F to 140°F in 1°F increments.
• Compact design that can fit under sinks, in closets, or other restricted spaces.
• Includes a scale inhibitor and ETL-certified overheat, dry-fire, and leak protection.

Cons:

• Requires hard wiring at 240V and approximately 75A; panel capacity must be verified.
• Maximum flow varies significantly with inlet temperature, from a stated 2.6 GPM at 57°F to 4.2 GPM at 77°F.
• Professional installation is recommended.

This model offers a practical middle ground between point-of-use and higher-capacity whole-house heaters. Its real-world flow will depend heavily on incoming water temperature, so use the listed performance figures when evaluating your application.

Maximum Whole-Home Output – 36kW WiFi Tankless Water Heater

For shoppers comparing tankless water heaters with wifi, the WINTEMP WN36 is a high-output option designed for larger hot-water demands. Its 36kW system can deliver up to 8.7 GPM, while self-modulation adjusts power according to flow and incoming water temperature.

Best For: Homes with 3–5 bathrooms in mild to moderate climates that need substantial whole-house hot-water capacity.

Pros:

• Up to 8.7 GPM for continuous on-demand hot water.
• Built-in WiFi enables smartphone temperature control.
• Self-modulating operation can reduce power use when demand falls.
• ETL certified with leakage, overheat, and dry-fire protection.

Cons:

• Requires a recommended 300A household electrical service.
• Installation requires four 40A double-pole breakers and four 8/2 AWG cables with ground.
• Its high electrical demand makes professional installation especially important.

The WN36 offers impressive capacity in a compact wall-mounted enclosure, but its electrical requirements are substantial. Verify your service capacity and installation plan with a licensed electrician before buying.

Balanced Whole-Home Performance – 27kW WiFi Tankless Water Heater

The WINTEMP WM27V is a practical middle-capacity choice among tankless water heaters with wifi. It provides up to 6.5 GPM and uses automatic flow control to help maintain outlet temperature when demand approaches the unit’s capacity.

Best For: Homes needing hot water for two to four points of use, with enough electrical capacity for a 27kW heater.

Pros:

• Up to 6.5 GPM with automatic flow control for steadier temperatures.
• App control works with Smart Home and Tuya Smart platforms.
• Tracks water flow plus water and electricity usage in the app.
• Compact wall-mounted design measures 15.9 by 13 by 4.2 inches.

Cons:

• A 200A household service is recommended.
• Requires three 40A double-pole breakers and three sets of 8 AWG wiring.
• Flow may be slightly reduced if hot-water demand exceeds capacity.

With a useful balance of flow capacity, smart controls, and compact sizing, the WM27V fits many whole-home applications. Confirm electrical requirements and have a qualified electrician assess the installation before purchase.

Compact Mid-Range Choice – 18kW WiFi Tankless Water Heater

For smaller households seeking tankless water heaters with wifi, the WINTEMP WM18V combines app-based controls with up to 4.3 GPM of on-demand hot water. Its auto flow control is designed to help maintain a stable outlet temperature as demand changes.

Best For: Homes with two to three simultaneous points of use and suitable 240V electrical service.

Pros:

• Up to 4.3 GPM for smaller whole-home applications.
• WiFi app supports temperature settings from 86°F to 140°F.
• App monitors water flow and tracks water and electricity usage.
• Compact 15.9-by-13-by-4.2-inch wall-mounted design.

Cons:

• A 150A household service is recommended.
• Requires two 40A double-pole breakers and two sets of 8 AWG wiring.
• Lower flow capacity may be limiting for larger households or heavier simultaneous demand.

The WM18V is the most accessible capacity option in this group, with useful smart-home features and space-saving dimensions. Its electrical setup and expected simultaneous demand should be checked carefully before installation.

How We Picked the Best Tankless Water Heaters with Wifi

We compared the selected models by heating capacity, advertised flow rate, fuel type, temperature range, connectivity, installation flexibility, and intended use. Gas units were evaluated for high-demand whole-home applications, while electric models were considered for homes with adequate 240-volt service, smaller spaces, or simpler point-of-use installations.

Advertised GPM is a useful starting point, but actual flow depends on incoming water temperature, desired output temperature, and how many fixtures run simultaneously. We also looked for practical features such as app control, digital displays, flow management, scale mitigation, ETL certification, and compatibility with natural gas or propane where specified.

Quick Comparison

Best For	Recommended Type	What to Prioritize
Large households and simultaneous showers	High-output gas	BTU capacity, condensing efficiency, and venting
Moderate whole-home demand	24kW–27kW electric	Available amperage, breaker capacity, and flow rate
Smaller homes or limited demand	18kW electric	Expected GPM and incoming water temperature
One bathroom or a single fixture	11kW electric	Point-of-use suitability and circuit requirements
Maximum electric capacity	36kW electric	Multiple circuits, panel capacity, and professional installation

Key Buying Factors for Tankless Water Heaters with Wi‑Fi

Fuel Type and Installation

Gas models generally provide higher output for demanding whole-home use, but they require appropriate gas lines, venting, combustion-air provisions, and professional installation. Electric units avoid combustion and venting, yet high-wattage models may need multiple dedicated 240-volt circuits and a substantial electrical panel upgrade.

Flow Rate and Temperature Rise

Do not select a heater by maximum GPM alone. Estimate the fixtures likely to operate together, then account for cold groundwater and the temperature rise needed at your faucets. A model rated around 4 GPM may suit moderate demand, while larger households may need a higher-capacity gas unit or a 27kW–36kW electric system.

Wi‑Fi Features and Controls

Smart connectivity is most useful when the app provides temperature adjustment, operating status, alerts, scheduling, or diagnostic information. Confirm whether Wi‑Fi setup requires a dedicated app, a stable 2.4GHz network, or a separate control module. Smart features should supplement—not replace—proper sizing and installation.

Maintenance and Certification

Tankless heaters may need periodic descaling, especially in hard-water areas. Look for accessible service controls, scale-inhibiting features, and recognized safety certification such as ETL where listed. Follow the manufacturer’s maintenance schedule and local plumbing and electrical codes.

Who Should Buy Which Tankless Water Heaters with Wifi?

Choose a high-output condensing gas model for a larger home with multiple simultaneous hot-water demands and existing gas infrastructure. Select a 24kW or 27kW electric unit for moderate whole-home demand when the electrical service can support it. An 18kW model is better suited to smaller households or warmer climates, while an 11kW unit makes more sense for one fixture or a limited point-of-use application. A 36kW electric heater is intended for the highest electric demand, but its circuit and panel requirements should be verified by a qualified electrician before purchase.