Tankless water heaters with Wi-Fi can deliver on-demand hot water while making temperature settings, usage monitoring, and diagnostics easier to manage from a phone. The right model depends on your fuel source, household demand, electrical capacity, and installation setup.
We compared 10 gas and electric options across heating output, flow rate, connectivity, efficiency, and intended use to help you narrow the choices quickly.
Best 10 Tankless Water Heaters with Wifi Picks for 2026
Flexible Gas Smart Pick
120,000 BTU WiFi Natural Gas Heater
- 5.1 GPM output for multiple fixtures
- WiFi/app temperature and maintenance controls
- Indoor/outdoor-convertible installation
Best For: Large households wanting smart natural-gas water heating
High-Capacity Smart Gas Upgrade
Rinnai RX199iN 11.1 GPM Heater
- 11.1 GPM capacity for up to seven fixtures
- Natural gas or propane compatibility
- 0.98 UEF condensing design
Best For: Large homes with demanding simultaneous hot-water use
Compact Electric Smart Choice
- 5.55 GPM electric whole-home output
- Alexa and Google Home compatibility
- Slim 240V wall-mounted design
Best For: Space-conscious homes with robust electrical service
Outdoor Gas Value Pick
- 9.5 GPM output for three to four showers
- Outdoor installation avoids venting
- WiFi capability and 15-year heat-exchanger warranty
Best For: Large homes with a suitable outdoor installation location
Best Whole-Home Value
WINTEMP WN18 18kW WiFi Tankless Water Heater
- 4.3 GPM maximum flow for household hot water use
- Remote WiFi temperature control
- Requires two 40A breakers and 150A service recommended
Best For: Two- to three-bathroom homes in mild to moderate climates
Best for Smaller Homes
Electrolux 14kW WiFi Tankless Water Heater
- 3.4 GPM maximum flow for one to two fixtures
- WiFi and Alexa temperature control
- Compact design with built-in scale inhibitor
Best For: Apartments and small households with modest simultaneous demand
Best for Higher Demand
WINTEMP WN27 27kW WiFi Tankless Water Heater
- 6.5 GPM maximum flow for greater household demand
- Remote WiFi temperature adjustment
- Requires three 40A breakers and substantial household service
Best For: Two- to three-bathroom homes needing higher simultaneous flow
Best Compact Point-of-Use Pick
Westinghouse 11kW WiFi Tankless Heater
- Up to 2.56 GPM output
- Alexa and Google Home compatible
- Compact ETL-certified design
Best For: Single showers, apartments, and point-of-use installations
Best Whole-Home Capacity
27kW WiFi Electric Tankless Heater
- Up to 6.5 GPM flow
- Designed for two to four points of use
- Tuya Smart app monitoring
Best For: Higher-demand homes with 200A electrical service
Best Smart-Control Upgrade
- Three-second instant heating
- Temperature memory after outages
- ETL and IPX4 protection
Best For: Single-point use with advanced smart-home controls
Flexible Gas Smart Pick – 120,000 BTU WiFi Natural Gas Heater
If you want tankless water heaters with wifi for a natural-gas home, this Mizudo model combines app control with flexible installation. Its 5.1 GPM output is suited to multiple fixtures, while the indoor/outdoor-convertible design can accommodate different layouts when the required accessories are purchased.
Best For: Large households needing smart control and hot water for two to four usage points.
Pros:
- WiFi and app control allow temperature adjustments, energy monitoring, and maintenance notifications.
- 120,000 BTU output and 5.1 GPM flow support simultaneous use across multiple bathrooms.
- Indoor or outdoor convertible installation, with freeze, dry-burn, flame-failure, and exhaust-blockage protection.
- Includes a 2-year full-unit warranty and 5-year heat-exchanger coverage.
Cons:
- Indoor installation requires a 3-inch OD vent system.
- Outdoor conversion requires a separately purchased accessory kit.
- Natural-gas installation may require professional setup.
With app-based management, stable temperature control, and adaptable placement, this is a practical smart gas option for families that do not need the higher flow rates of premium commercial-size units.
High-Capacity Smart Gas Upgrade – Rinnai RX199iN 11.1 GPM Heater
Among tankless water heaters with wifi, the Rinnai RX199iN stands out for its high 11.1 GPM capacity and compact condensing design. WiFi control requires the separately sold Controlr module, but the unit supports natural gas or propane and can be installed indoors or outdoors with the appropriate setup.
Best For: Large homes that may run up to seven fixtures at once and want a high-efficiency gas system.
Pros:
- Up to 11.1 GPM and 199,000 BTU support heavy simultaneous demand.
- Smart Sense gas control supports natural gas or propane operation.
- Indoor/outdoor installation flexibility with Versa Vent compatibility.
- Condensing design reaches a stated 0.98 UEF and includes a Quick Flush feature.
Cons:
- WiFi control requires a Controlr module that is not included.
- Professional installation is recommended.
- The outdoor installation requires an RX-OVC vent cap.
This is the strongest capacity choice in the group, but its additional WiFi module and professional installation requirements increase the planning and setup cost.
Compact Electric Smart Choice – Westinghouse 24kW WiFi Heater
For buyers comparing tankless water heaters with wifi without using gas, this Westinghouse electric model offers app and voice control through Alexa or Google Home. Its 24kW system delivers up to 5.55 GPM, but the 240V unit requires substantial electrical capacity, including a 100A current rating and three 40-amp double-pole breakers.
Best For: Apartments, homes, cabins, and other spaces with sufficient 240V electrical service and moderate whole-home demand.
Pros:
- Smart WiFi supports remote temperature adjustment and usage monitoring.
- Alexa and Google Home compatibility adds voice-control convenience.
- Compact 17-inch by 13-inch by 4.3-inch wall-mounted design saves floor space.
- Up to 5.55 GPM flow can support a shower and sink simultaneously.
Cons:
- Requires hard wiring, 100A current, three 40-amp double-pole breakers, and three 8 AWG wires.
- Its maximum flow is lower than the high-capacity gas models in this roundup.
- Electrical service upgrades may be necessary for some homes.
This model is appealing when avoiding gas and venting is a priority, but buyers should confirm electrical capacity before choosing it for whole-home use.
Outdoor Gas Value Pick – Rheem RTG 9.5 GPM WiFi Heater
This Rheem is one of the more straightforward tankless water heaters with wifi for large households: it delivers 9.5 GPM from a natural-gas, outdoor-installation design. Because outdoor placement eliminates venting, it can simplify installation planning, though professional installation is required.
Best For: Multi-bathroom homes seeking high-flow natural-gas heating with outdoor installation.
Pros:
- 9.5 GPM flow and 199,900 BTU output support three to four simultaneous showers.
- Outdoor installation eliminates the need for indoor venting.
- WiFi capability and digital controls offer convenient temperature management.
- Includes freeze and flame-failure protection plus a 15-year heat-exchanger warranty.
Cons:
- Designed for outdoor installation rather than indoor placement.
- Professional installation is required.
- Its non-condensing design has a stated 0.82 UEF, lower than the Rinnai’s listed 0.98 UEF.
The Rheem balances strong flow, outdoor-installation simplicity, and long warranty coverage, making it a sensible choice when an exterior mounting location is available.
Best Whole-Home Value – WINTEMP WN18 18kW WiFi Tankless Water Heater
For shoppers comparing tankless water heaters with wifi, the WINTEMP WN18 combines remote temperature control with 18kW self-modulating electric heating. Its 4.3 GPM maximum flow is positioned for showers and everyday household use, but installation demands careful electrical planning.
Best For: Homes with two to three bathrooms in mild to moderate climates that have adequate electrical service.
Pros:
- WiFi control lets you adjust the temperature remotely.
- Self-modulating operation adjusts power to water flow and incoming temperature.
- Compact 11.1-by-19.2-by-4-inch wall-mounted design saves space.
- ETL certification plus leakage, overheat, and dry-fire protection add reassurance.
Cons:
- Requires two 40A double-pole breakers and 8/2 AWG wiring.
- A 150A household service is recommended, so professional electrical review is important.
- The 4.3 GPM maximum may be limiting for several simultaneous high-flow fixtures.
The WN18 is a practical middle-ground option for buyers who want WiFi convenience and continuous hot water without a storage tank. Confirm panel capacity, wiring, and expected flow before ordering.
Best for Smaller Homes – Electrolux 14kW WiFi Tankless Water Heater
The Electrolux 14kW is a compact choice among tankless water heaters with wifi, offering app-based temperature adjustment and Alexa compatibility. With a 3.4 GPM maximum flow, it is designed for one to two fixtures rather than broad, simultaneous whole-home demand.
Best For: Apartments, small homes, and households that typically use one or two hot-water fixtures at a time.
Pros:
- Built-in WiFi supports smartphone temperature adjustment from 80°F to 140°F.
- Alexa compatibility enables voice control.
- Compact 8.9-by-12.8-by-3.3-inch design fits tight spaces.
- Includes a scale inhibitor and multiple safety protections, including overheat, dry-fire, and leakage protection.
Cons:
- Its 3.4 GPM maximum is intended for one to two fixtures.
- Installation requires a 240V, 60A two-pole breaker and 6 AWG copper wiring.
- The listed whole-unit warranty is one year.
This Electrolux model stands out when compact size and smart-home integration matter more than maximum flow. Check your electrical panel and fixture usage carefully, especially if you expect multiple simultaneous showers or appliances.
Best for Higher Demand – WINTEMP WN27 27kW WiFi Tankless Water Heater
For households needing more capacity from tankless water heaters with wifi, the WINTEMP WN27 delivers a 27kW output and up to 6.5 GPM. It uses self-modulation for stable temperature and provides remote WiFi adjustment, though its substantial electrical requirements should be evaluated before purchase.
Best For: Larger households with two to three bathrooms that need higher flow for showers and everyday hot-water use.
Pros:
- 6.5 GPM maximum flow offers more capacity than the smaller models in this roundup.
- WiFi control allows temperature adjustment without being beside the heater.
- Self-modulating heating responds to flow rate and incoming water temperature.
- ETL certification and leakage, overheat, and dry-fire protection support safer operation.
Cons:
- Requires three 40A double-pole breakers and three 8/2 AWG wiring runs.
- A 200A household service is recommended, with the notes also specifying a recommended 250A power supply.
- Its higher electrical demand may make installation more involved and costly.
The WN27 is the strongest fit here for buyers prioritizing flow capacity and continuous hot water. Its compact wall-mounted form is convenient, but an electrician should verify service capacity and installation requirements first.
Best Compact Point-of-Use Pick – Westinghouse 11kW WiFi Tankless Heater
If you need tankless water heaters with wifi for a single shower or point-of-use application, this compact Westinghouse model offers app and voice control in a wall-mounted design. Its 11kW output reaches up to 2.56 GPM, with temperature adjustment from 86°F to 140°F.
Best For: Apartments, offices, and homes needing hot water at one primary point of use.
Pros:
- WiFi control works with the app, Alexa, and Google Home.
- Compact 14.2-by-9.5-by-3.5-inch wall-mounted design saves space.
- ETL certification and four-layer protection cover leakage, overheating, dry firing, and high voltage.
- Provides up to 2.56 GPM with a 0.4 GPM activation flow.
Cons:
- Requires hard wiring, one 50A double-pole breaker, and 8 AWG wire.
- Its 11kW output is primarily suited to one shower or limited simultaneous use.
This is a practical choice when space and smart controls matter more than whole-home capacity. Confirm the electrical requirements and expected flow before purchasing.
Best Whole-Home Capacity – 27kW WiFi Electric Tankless Heater
Among tankless water heaters with wifi, this 27kW model is designed for higher-demand households. It can deliver up to 6.5 GPM for two to four points of use, while smart self-modulation adjusts power to flow and temperature.
Best For: Homes that need simultaneous hot water at multiple fixtures and have sufficient electrical service.
Pros:
- Up to 6.5 GPM of stable hot water output.
- Tuya Smart and smart-home app control includes temperature, flow, and usage monitoring.
- Self-modulating operation reduces power when demand falls and enters zero-energy standby when unused.
- ETL certified with leakage, overheat, and dry-fire protection.
Cons:
- Requires three 40A double-pole breakers and three sets of 8 AWG wiring.
- The notes recommend 200A household service and qualified electrician consultation.
- Its larger electrical demand may not suit homes with limited service capacity.
This model offers the strongest flow capacity in the group, but installation planning is essential. Verify household service, breaker space, wiring, and local requirements before ordering.
Best Smart-Control Upgrade – Westinghouse 11kW WiFi Heater
This Westinghouse is a compelling option among tankless water heaters with wifi when you want fast point-of-use heating and convenient smart controls. The 11kW unit reaches hot water in as little as three seconds and offers temperature memory after a power outage.
Best For: Single showers, apartments, cabins, and other residential or light commercial point-of-use applications.
Pros:
- WiFi and voice control work with Alexa and Google Home.
- Temperature memory restores the previous setting after a power outage.
- Provides up to 2.6 GPM under the stated test conditions with 98% thermal efficiency.
- ETL certified with four-layer protection, IPX4 rating, and a removable inlet filter for maintenance.
Cons:
- Requires a dedicated 60A double-pole breaker and 8 AWG wire.
- The 0.53 GPM startup flow and 11kW capacity make it better suited to one water point than broad whole-home demand.
Choose this version if temperature memory, voice control, and straightforward filter maintenance are priorities. Its electrical requirements should be confirmed with a qualified installer before purchase.
How We Picked the Best Tankless Water Heaters with Wifi
We selected models representing the main categories shoppers compare: natural-gas units for higher whole-home demand, high-powered electric systems for homes with adequate 240-volt service, and compact point-of-use heaters for a single fixture or limited application. We considered stated BTU or kilowatt output, maximum flow rate, indoor or outdoor installation, Wi-Fi or app functionality, certification claims, and the practical demands of installation and maintenance.
Because performance depends on incoming-water temperature, flow rate, plumbing layout, and local electrical or gas conditions, published capacity should be treated as a comparison point rather than a guarantee.
Quick Comparison
| Type | Best suited for | Main consideration |
|---|---|---|
| Natural gas | Higher-demand whole-home use | Requires gas, venting, and professional installation |
| High-output electric | Homes with strong 240V service | May require multiple large breakers and electrical upgrades |
| Mid-output electric | Smaller homes or moderate demand | Flow can drop in colder incoming water |
| Point-of-use electric | One fixture or remote application | Not intended to supply an entire household |
Key Buying Factors for Tankless Water Heaters with Wi-Fi
Fuel Source and Installation
Gas models need compatible fuel lines, combustion air, venting, condensate management on condensing designs, and often a dedicated electrical connection. Electric models avoid combustion venting but can draw substantial current. Confirm your panel capacity, breaker requirements, wire sizing, and available 240V circuits before buying.
Flow Rate and Temperature Rise
GPM ratings are typically measured under specific conditions. A shower, dishwasher, and washing machine operating together require more capacity than one fixture. Cold climates generally require a greater temperature rise, reducing the real-world flow available at a comfortable temperature. Use your peak simultaneous demand—not just the household size—to compare models.
Wi-Fi Features
Connectivity is most useful when it supports remote temperature adjustment, scheduling, usage information, fault alerts, or maintenance reminders. Check whether the unit requires a separate module, which app it uses, and whether the Wi-Fi connection works reliably where the heater will be installed. Smart controls do not compensate for insufficient heating capacity.
Efficiency, Durability, and Service
Look for the unit’s efficiency rating, warranty terms, freeze protection, scale-control requirements, and availability of replacement parts. Hard water may require more frequent flushing, especially in areas with mineral-heavy supply. Confirm local service support and installation rules before choosing a lesser-known model.
Who Should Buy Which Tankless Water Heaters with Wifi?
Choose a natural-gas model when you need strong whole-home performance and already have suitable gas and venting infrastructure. Choose a high-kilowatt electric unit when your home has sufficient 240V electrical capacity and you prefer to avoid combustion equipment. A mid-range electric heater can suit a smaller household with moderate simultaneous demand, while an 11kW point-of-use model is better for a single sink, bathroom, or other limited application.
For any of these tankless water heaters with Wi-Fi, verify dimensions, connection requirements, local code compliance, and professional installation needs before ordering. The best match is the model that meets your peak hot-water demand without forcing costly electrical, gas, or plumbing changes.