Best Tankless Water Heater WiFi: Smart on-Demand Heat for Modern Homes
Find the right tankless water heater with WiFi control to match your home, hot-water needs, and energy goals. This guide focuses on units that provide on-demand hot water and pair with smart apps for remote monitoring and adjustment. Ideal buyers include new-home builders seeking space-saving solutions, families wanting reliable shower be-spoke performance, and homeowners aiming to cut energy use without sacrificing comfort.
Summary table of chosen products
| Product | Power Type | Max GPM | WiFi | Best For |
|---|---|---|---|---|
| WINTEMP WM27V Plus | Electric | 6.5 | Yes | 2–4 bathroom homes |
| WINTEMP WM18V Plus | Electric | 4.3 | Yes | 2–3 fixtures |
| WINTEMP 18kW (B0DLKQY4B3) | Electric | 4.3 | Yes | Whole-house shower needs |
| Westinghouse Smart Tankless (Gas) | Gas | 7.9 | Yes | 3–5 fixtures, gas users |
| Electrolux 14kW | Electric | 3.4 | Yes | 1–2 fixtures, smart home users |
WINTEMP 27kW WM27V Plus Tankless Electric
Best for large households needing continuous hot water with strong simultaneous demand. This model supplies up to 6.5 GPM and includes self-modulating technology that saves energy by adjusting power based on flow and temperature. WiFi control enables remote temperature adjustments and status checks. Installation requires a robust electrical supply—200 Amp service is recommended.
- Hot water output: up to 6.5 GPM
- WiFi-enabled with LED display
- Self-modulating for energy savings
- 3 × 40 Amp DP breakers; 3 × 8 AWG wiring
Best for: Homes with 2–4 bathrooms in mild climates where a dependable, high-flow electric tankless unit is desired. Caution: Requires skilled electrical work and appropriate service capacity.
WINTEMP WM18V Plus 18kW Tankless Electric
Best for smaller homes or apartments needing efficient on-demand hot water with smart control. Delivers up to 4.3 GPM and supports 2 fixtures at a comfortable rate. Self-modulating energy management helps conserve power, with a zero-energy standby when not in use.
- Output: up to 4.3 GPM
- WiFi control and LED display
- Self-modulating; true zero-energy standby
Best for: 2–3 bathroom homes or condos where space is at a premium and a moderate flow is sufficient. Caution: Requires 150 Amp service and precise installation to meet electrical needs.
WINTEMP 18kW Tankless Electric (WN18)
Best for full-house hot water without preheating delays, with precise temperature control. It maintains stable water temperature automatically and provides up to 4.3 GPM. Includes WiFi control for remote adjustments and status monitoring.
- GPM: 4.3; 18 kW, 75 A
- LED temperature display with WiFi
- 3/4″ NPT water connections
Best for: Homes needing seamless showers and daily activities with reliable hot water. Caution: Needs two 40 Amp DP breakers and proper wiring.
Westinghouse Smart Tankless Gas Heater
Best for households that prefer gas heat with room-by-room control via a WiFi app. It provides up to 7.9 GPM at 180,000 BTU. The smart app allows temperature adjustments and status checks, supporting 3–5 fixtures simultaneously.
- GPM and BTU: 7.9 GPM, 180,000 BTU
- WiFi app control; precise ±1°F temperature stability
- Indoors, non-condensing design
Best for: Larger homes with high hot-water demand and a gas line ready for indoor installation. Caution: Gas models require venting and proper clearance per local codes.
Electrolux 14kW WiFi Tankless Electric
Best for compact spaces and smart-home integration with Alexa. Delivers up to 3.4 GPM for 1–2 fixtures. Features smart WiFi and voice control, along with self-modulating technology to maximize efficiency and extend unit life with a built-in scale inhibitor.
- GPM: 3.4; 14 kW
- Smart WiFi with Alexa compatibility
- Scale inhibitor helps reduce maintenance
Best for: Small homes or apartments where space is limited and smart controls are a priority. Caution: Lower flow capacity may not meet high-demand scenarios.
Buying Guide: Key Considerations for WiFi Tankless Water Heaters
What installation requirements should I plan for?
Electric models demand a robust electrical service. Check required ampacity, breaker count, and wire gauge. Gas models need proper venting and gas line sizing. Electrical and gas codes vary by locality; consult a licensed professional for compliance and safety.
How do I choose by household size and hot-water demand?
Estimate peak GPM based on fixtures used simultaneously (showers, sinks, laundry). Electric units with higher GPM are better for larger homes; smaller units suit 1–2 bathroom setups. Consider a unit with self-modulating technology to adapt to real-time needs and reduce waste.
Why is WiFi control valuable?
WiFi-enabled units let you monitor temperature, confirm operation, and adjust settings remotely. This can reduce energy waste and simplify maintenance. Ensure the app is compatible with your devices and that updates are supported by the manufacturer.
What are common limitations to expect?
High-demand showers may outpace some models. Electric units require significant service capacity; gas units depend on venting and gas supply. Always verify installation clearances, water connections, and required minimum flow rates to prevent cold-water surges.
How do I compare long-term costs?
Look beyond upfront price. Compare energy savings from self-modulating technology, maintenance needs, and potential water-heating efficiency. Units with true zero-energy standby lower standby losses when not in use, contributing to fewer operating costs over time.
Frequently Asked Questions
- Which WiFi tankless heater is best for multi-bath homes? Units with higher GPM like 6.5–7.9 GPM are better for simultaneous showers across multiple bathrooms.
- Do these heaters require professional installation? Yes. Most models require licensed electricians or plumbers due to electrical service and gas venting requirements.
- Can I install a WiFi tankless water heater in a small apartment? Yes, select smaller GPM units with 1–2 fixtures in mind, ensuring electrical service and plumbing fit the unit’s specs.
- Is WiFi control secure? Reputable brands provide app-based controls with standard security practices. Always keep firmware updated and use strong, unique passwords for home networks.
- What maintenance is needed? Self-modulating systems typically require minimal maintenance, but periodic checks for mineral buildup and professional servicing are advisable.
- Will these work in cold climates? Some models mention suitability for mild to moderate climates; confirm usable temperature ranges and check for anti-scaling features if you have hard water.