Best Tankless Water Heaters for Two Bathrooms

Choosing a tankless water heater that reliably serves two bathrooms requires evaluating flow rates, electrical needs, and space savings. The following selections are tailored for households needing on-demand hot water at multiple fixtures without the bulk of a traditional tank. Each model below offers varying power, installation options, and smart features to fit different homes and budgets.

Summary of Selected Products

Product	Brand	Approximate Power	Installation Type	Key Benefit
EcoSmart ECO 11 Electric Tankless Water Heater	EcoSmart	13 kW at 240 V	Wall-mount / point of use	Compact and energy efficient with self-modulating tech
Westinghouse APOLO-14kW Tankless Water Heater	Westinghouse	14 kW at 240 V	Wall-mount	Smart WiFi control with Alexa/Google integration
ORBEK 18kW Tankless Water Heater	Orbek	18 kW at 240 V	Wall-mount	High flow for 2–3 fixtures with quick hot water
Stiebel Eltron Tempra 29 Plus	Stiebel Eltron	28,800 W at 240 V	Hard-wired	Two temperature memory presets and compact design
Rheem 18kW Tankless Electric	Rheem	18 kW at 240 V	Wall-mount	Advanced self-modulation with durable copper elements

EcoSmart ECO 11 Electric Tankless Water Heater

Features include endless on-demand hot water and a self-modulating technology that adjusts power usage to the flow rate. Temperature is monitored continuously, maintaining a chosen setting within one degree. Amperage draw is about 54 A, with a compact footprint that saves space and offers flexible mounting options. Ideal for point-of-use installation or small home setups.

Westinghouse APOLO-14kW Smart Tankless Water Heater

Designed for simultaneous use, APOLO-14kW delivers continuous hot water at 0.5–3.38 GPM, depending on inlet temperature and flow. It supports smart control via a compatible app and voice assistants, with temperature adjustments from 86°F to 140°F in 1-degree steps. It’s compatible with standard 60-amp breakers and requires proper wiring for reliable operation.

ORBEK 18kW Tankless Water Heater

Orbek’s 18kW model supports up to 4.17 GPM, offering hot water for 2–3 fixtures with fast response. It emphasizes energy efficiency through water-electricity separation to minimize scale and corrosion. The setup requires a robust electrical system, including two-pole 240V operation and appropriate circuit capacity to avoid interruptions.

Stiebel Eltron Tempra 29 Plus

This model provides a continuous supply of hot water on demand with a compact, vent-free design. It includes multiple temperature memory presets for quick adjustments and requires a hard-wired 240 or 208-volt service. The unit can deliver up to 28,800 watts at 240 volts, supporting a comfortable flow for multiple uses.

CAMPLUX Tankless Water Heater 6kW

Camplux offers under-sink instant hot water with temperature display and self-modulating technology. The 6kW unit is designed for point-of-use and is CSA approved, delivering consistent hot water with a compact footprint. It emphasizes energy savings by heating only when water is drawn, ideal for single-profile usage such as a bathroom sink or small basin.

ORBEK 14kW Tankless Electric with LED Display

This 14kW model from Orbek includes an LED digital display for easy temperature monitoring. It highlights the requirement of a 240V/60A two-pole breaker and 1/2″ NPT connections. The unit supports 2–3 points of use with up to 3.38 GPM, balancing performance and energy efficiency for mid-size households.

SIVUATEK 14kW Tankless Electric

SIVUATEK’s 14kW unit offers 2-point usage with self-modulating energy efficiency. It emphasizes eliminating standby loss and delivering up to 99% thermal efficiency. The installation notes include a 60-amp circuit requirement and a standard 1/2″ NPT water connection, suitable for compact spaces under sinks or on walls.

Rheem 18kW Tankless Electric

Rheem’s 18kW model features external digital thermostatic control with an LED display and advanced self-modulation to match hot water demand. It uses durable copper immersion elements and is designed for field serviceability, delivering up to 4.4 GPM. This unit suits medium to larger households with higher simultaneous hot water needs.

Buying Guide: Key Purchase Considerations

• Household hot water demand: Calculate total GPM needed for showers, baths, sinks, and appliances. A two-bath setup often benefits from units in the 3–4 GPM range at peak usage, or multiple smaller units for better zoning.
• Electrical system and wiring: Many tankless heaters require dedicated electrical capacity (often 40–60A per unit). Confirm panel capacity and wire gauge before purchase or installation.
• Installation location: Wall-mount tankless heaters save space and can be placed near point-of-use for reduced lag, but ensure venting (if applicable) and accessibility for service.
• Temperature control: Look for units with precise temperature adjustment, memory presets, and clear digital displays to prevent scalding and maintain comfort.
• Smart features: WiFi connectivity, mobile apps, and voice assistant compatibility can simplify monitoring and control, but verify compatibility with your existing smart ecosystem.
• Durability and maintenance: Consider units with copper components and corrosion-resistant interfaces. Access to service parts and ease of warranty claims are important for long-term reliability.
• Energy efficiency: Self-modulating or on-demand heating minimizes standby losses. Compare energy factor and real-world efficiency, especially when upgrading from a traditional tank.
• Water chemistry: In hard-water areas, corrosion resistance and descaling features matter. Some models offer anti-scale designs or easy-to-clean heat exchangers.
• Code compliance and installation: Ensure the unit meets local electrical codes and that installation is performed by a licensed professional where required.

Note: This article presents a range of 14kW–18kW electric tankless heaters suitable for households with two bathrooms, emphasizing efficiency, space savings, and smart capabilities. Always confirm compatibility with your home’s electrical system and water supply conditions before purchasing.