A smart tankless water heater lets you check and change the hot water temperature from your phone, set comfort presets for each family member and see alerts when something needs attention. Some also work with voice assistants. These four Wi-Fi models, two gas and two electric, are the best smart picks we found.
We compared app features, flow, temperature control and installation needs using manufacturer specifications and owner feedback. For scored reviews see tankless water heater smart reviews, or see the best tankless water heater guide; our Editorial Policy explains our process. Most units need 2.4GHz Wi-Fi; gas models need licensed installation.
Top 3 Best Smart Tankless Water Heaters
Westinghouse HW180A0G-NG 7.9 GPM Wi-Fi Natural Gas Tankless (Indoor)
- 7.9 GPM
- App
- 3 showers
WINTEMP WM27V 27kW 240V Wi-Fi Electric Tankless Water Heater
- 27kW
- 6.5 GPM
- Temp lock
Electrolux 11kW 240V Smart Wi-Fi Electric Tankless Water Heater
- 11kW
- Voice control
- One circuit
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Smart Tankless Water Heaters Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  Westinghouse HW180A0G-NG 7.9 GPM Wi-Fi Natural Gas Tankless (Indoor) |
| Check Latest Price |
| 2 |  WINTEMP WM27V 27kW 240V Wi-Fi Electric Tankless Water Heater |
| Check Latest Price |
| 3 |  APUS AP-AWH-Q20NG 6.8 GPM Wi-Fi Natural Gas Tankless with Booster |
| Check Latest Price |
| 4 |  Electrolux 11kW 240V Smart Wi-Fi Electric Tankless Water Heater |
| Check Latest Price |
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1. Westinghouse HW180A0G-NG 7.9 GPM Wi-Fi Natural Gas Tankless (Indoor)
Best Overall
- Up to 7.9 GPM, 180,000 BTU, about 3 showers at once
- Wi-Fi app control
- ±1°F temperature control
- LED display, overheat protection
- Natural gas version
- Venting and gas line work needed
- Fuel: natural gas
- Flow: up to 7.9 GPM
- Model: HW180A0G-NG
Westinghouse’s gas unit pairs whole-house flow with an app for remote temperature changes.
It suits 2–3 bathroom homes on natural gas.
Who the Westinghouse 7.9 GPM NG fits best
Natural gas homes that want app control.
Who should skip the Westinghouse 7.9 GPM NG
Propane homes.
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2. WINTEMP WM27V 27kW 240V Wi-Fi Electric Tankless Water Heater
Best Smart Electric
- 27kW, up to 6.5 GPM
- Wi-Fi via Tuya Smart
- Auto Flow Control for stable temperature
- Temperature lock and memory
- 200A service recommended
- Very high amp draw
- Power: 27kW, 240V
- Flow: up to 6.5 GPM
- Model: WM27V
WINTEMP’s WM27V is a whole-house electric unit you can run from your phone.
Temperature lock prevents accidental changes by kids.
Who the WINTEMP WM27V fits best
Electric homes with large service.
Who should skip the WINTEMP WM27V
Small panels.
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3. APUS AP-AWH-Q20NG 6.8 GPM Wi-Fi Natural Gas Tankless with Booster
Best Booster Flow
- 140,000 BTU, up to 6.8 GPM
- Wi-Fi remote control with Tuya app
- Booster flow up to 130% and zero-cold-water tech (per maker)
- Indoor install, vent included
- Newer brand
- Natural gas only
- Fuel: natural gas
- Flow: up to 6.8 GPM
- Model: AP-AWH-Q20NG
APUS adds a booster pump that helps in homes with low water pressure.
Its app makes temperature tweaks easy.
Who the APUS 6.8 GPM NG fits best
Low-pressure homes.
Who should skip the APUS 6.8 GPM NG
Propane homes.
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4. Electrolux 11kW 240V Smart Wi-Fi Electric Tankless Water Heater
Best Compact Smart
- 11kW, about 2.6 GPM
- Smart Wi-Fi and voice control
- Stable temperature control
- Overheat and dry-run protection, ETL
- Needs 60A breaker and 150A+ panel
- One to two fixtures
- Power: 11kW, 240V
- Flow: about 2.6 GPM
- Brand: Electrolux
Electrolux’s 11kW unit brings app and voice control to apartments and small homes.
It runs on a single circuit.
Who the Electrolux 11kW smart fits best
Apartments.
Who should skip the Electrolux 11kW smart
Whole-house use.
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What to Look for in a Smart Tankless Heater
- App features: remote temperature, presets, usage and alerts.
- Voice: Alexa or Google support.
- Wi-Fi: most need 2.4GHz near the unit.
- Offline control: the panel should still work without Wi-Fi.
Frequently Asked Questions
What is the best smart tankless water heater?
The Westinghouse 7.9 GPM gas unit for its flow and app control.
Do smart tankless heaters need Wi-Fi?
Only for app features; the panel works without it.
Can I use Alexa with a water heater?
Some models, like the Electrolux 11kW, support voice control.
Is app control safe?
Use temperature locks and anti-scald valves for safety.
Final Verdict: Best Tankless Water Heater Smart
The Westinghouse 7.9 GPM gas unit is the best smart tankless water heater. The WINTEMP WM27V is the best smart electric model, and the Electrolux 11kW is the best compact smart choice.
Overall: Westinghouse HW180A0G-NG 7.9 GPM Wi-Fi Natural Gas Tankless (Indoor) Check Latest Price
Smart electric: WINTEMP WM27V 27kW 240V Wi-Fi Electric Tankless Water Heater Check Latest Price
Compact smart: Electrolux 11kW 240V Smart Wi-Fi Electric Tankless Water Heater Check Latest Price
Control your hot water from anywhere.
Looking for something else? Browse all of our Water Heaters guides and the wider Heating & Cooling section.
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