Best Smart Electric Water Heaters for Instant Hot Water and Remote Control
Smart electric water heaters bring on-demand hot water, improved energy efficiency, and seamless integration with voice assistants. This guide highlights five top options currently popular on Amazon, combining tankless units and smart-tue setups to help you choose the right fit for household size, installation space, and preferred control method. Each product is evaluated on flow capacity, connectivity, safety features, and ease of use. The selection includes compact under-sink models and whole-home solutions to cover a range of needs.
| Product | Type | Key Benefit | Smart Features |
|---|---|---|---|
| Westinghouse APOLO-2.0 | Tankless Electric | Instant hot water for 1 shower + 1 sink | Alexa/Google Home, App control |
| ECOTINYMACH 110V | Tankless Electric | Compact under-sink instant hot water | Remote control, Celsius/Fahrenheit |
| EcoSmart ECO 11 | Tankless Electric | Space-saving with self-modulating tech | Energy efficiency, compact |
| Westinghouse APOLO-27kW | Tankless Electric | Whole-home hot water with high flow | Smart WiFi, voice control |
| DOYXC 110V | Tankless Electric | Under-sink instant hot water | IPX4, digital display |
Note: All products listed have some form of smart control or remote operation. Consider home wiring, breaker capacity, and space requirements when evaluating which unit best fits your needs.
Westinghouse APOLO-2.0 14kW Tankless Water Heater
The APOLO-2.0 delivers continuous hot water on demand with a maximum flow around 3.38 GPM, suitable for a shower and sink simultaneously. It supports 1 X 60 AMP DP breakers and 6 AWG wiring, with bottom 1/2″ NPT water connections. Users can control temperature from 86°F to 140°F in 1° increments, and monitor status via an LED display. Smart features include voice control compatibility with Alexa and Google Home, enabling remote operation and temperature adjustments from a connected app or voice command.
Safety and efficiency notes: It provides instant hot water, reducing waiting time and temperature fluctuations during daily tasks. The device is ETL certified and IPX4 rated for splash resistance in typical bathroom or kitchen environments. When planning installation, ensure adequate electrical service and adherence to local electrical codes.
Under-Sink Tankless Water Heater 110V 3000W
This compact 110V unit uses 3000W to raise water by about 82°F at 0.3 GPM or to 131°F at 0.5 GPM, delivering on-demand hot water for sinks and small outlets. It sports an LED display to monitor temperature, with a user-friendly Fahrenheit/Celsius toggle. Ideal for installation in tight spaces under sinks or in compact kitchens and baths, the heater promotes energy efficiency and quick response times. Note that shower use typically requires higher GPM, so this model is best for point-of-use applications rather than full-house hot water.
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 is a compact, 13 kW at 240V unit featuring patented self-modulating technology. It is designed to supply endless on-demand hot water and is significantly smaller than traditional tank heaters—about 90% smaller in size. It adjusts energy use based on water flow, improving efficiency. This model is suitable for point-of-use or small-space installations, offering reliable performance with continuous temperature control within one degree of the desired setting. It is an excellent choice for homes with limited space or for supplementary hot water supply in a larger system.
ECOTINYMACH 110V Tankless Water Heater 5500W
This 110V, 5500W inline heater emphasizes compact design and remote operation. It supports conversion between Fahrenheit and Celsius and is positioned for under-sink or small-space use. The unit is intended for on-demand hot water without the need for storage tanks, and it emphasizes straightforward control to adjust temperature settings precisely. As with other high-power small units, ensure electrical capacity and mounting space meet local codes before installation.
Westinghouse APOLO-27kW 240V Tankless Water Heater
The APOLO-27kW unit is designed for whole-house hot water with high flow capacity, reporting up to 6.26 GPM. It supports 3 X 40 AMP DP breakers and 3 X 8 AWG wiring, with bottom 3/4″ NPT water connections. It enables simultaneous use across two bathrooms plus appliances like dishwashers and washing machines. Smart controls include app-based temperature adjustments from 86°F to 140°F in 1° increments, plus voice control compatibility through Alexa and Google Home. Local control is facilitated by an easy-to-use rotary knob and a clear LED display.
Buying Guide: Key Purchase Considerations
- Flow rate and simultaneous usage: Determine the number of outlets (showers, sinks, appliances) that may run at once and choose a unit with adequate GPM. Whole-home models offer higher flow, while point-of-use units excel in compact spaces.
- Electrical service and wiring: Tankless electric heaters demand substantial electrical capacity. Check breaker ratings, wire gauge, and panel space. Some units require multiple breakers or larger service upgrades for optimal performance.
- Smart features and compatibility: Look for WiFi or app control and voice assistant support if you want seamless integration with smart home ecosystems. Confirm compatibility with your preferred platform (Alexa, Google Home, etc.).
- Installation location and space: Under-sink and compact models suit tight spaces, while larger units are appropriate for main HVAC or utility rooms. Consider mounting options and venting requirements (where applicable).
- Safety features: IP ratings (e.g., IPX4), dry-boil protection, leakage protection, and automatic shutoffs enhance reliability. Confirm UL/ETL certifications and adherence to local electrical codes.
- Temperature control and stability: Self-modulating technology and precise temperature increments help prevent scalding and ensure consistent hot water. Check the method for temperature adjustment (app, knob, or digital display).
- Maintenance and serviceability: Review warranty terms, ease of service, and availability of replacement parts. Tankless units typically require periodic descaling in hard water areas.
- Installation cost vs. long-term savings: Although upfront costs can be higher for high-capacity smart units, energy savings and improved comfort can offset expenses over time.
In summary, for households seeking smart control and reliable on-demand hot water, the Westinghouse APOLO series offers strong performance with Alexa/Google compatibility, while EcoSmart ECO 11 and ECOTINYMACH provide compact, cost-efficient options for smaller spaces. The DOYXC and APOLO-27kW deliver additional versatility—smaller, under-sink solutions for limited spaces and a higher-capacity option for whole-home use. Evaluate your water usage patterns, space, and electrical readiness to select the best fit.