Best Energy Efficient Electric Water Heaters for the Home
Choosing an energy efficient electric water heater can reduce monthly utility bills while delivering reliable hot water for daily needs. This guide highlights five top-rated electric models, focusing on efficiency features, space savings, and installation considerations. Each product is evaluated on performance, energy use, and suitability for point-of-use or whole-home applications. Use the buying guide below to compare capacity, self-modulating technology, and installation requirements to find the best fit for your home.
| Product | Brand | Key Benefit |
|---|---|---|
| EcoSmart ECO 11 | EcoSmart | Slim, energy-saving tankless with 99% thermal efficiency |
| BOSCH Tronic 3000 T ES2.5 | Bosch | Compact point-of-use mini-tank with high efficiency |
| Orbek 14kW | Orbek | High-demand, space-saving tankless with quick heat |
| APUS 27kW | APUS | High flow, memory function with energy-saving self-modulation |
| Rheem RTEX-24 | Rheem | Powerful tankless with adjustable temperature and multiple breakers |
EcoSmart ECO 11 Electric Tankless Water Heater
Endless on-demand hot water with a compact footprint, the EcoSmart ECO 11 operates on 13 kW at 240 volts and uses patented self-modulating technology. It continuously monitors water temperature and adjusts flow to deliver hot water within 1 degree of the target. A key advantage is space efficiency and high energy savings due to heating only when demanded, contributing to lower energy bills for small to medium households. It measures 11.5 x 8 x 3.75 inches and is designed for wall or point-of-use installation.
Electrical requirements include a dedicated circuit with appropriate amperage. The unit is ideal where space is at a premium and where you want a scalable solution for additional point-of-use heat. While it may not supply large-lot concurrent hot water for entire homes, it excels at sinks, dishwashers, and showers in smaller configurations or in tandem with a primary heating system.
BOSCH Tronic 3000 T 2.5-Gallon Mini-Tank
This 2.5-gallon point-of-use mini-tank provides hot water right where you need it. With 98% thermal efficiency and a compact footprint, it’s designed for under-sink installation or inline with a larger hot water source. It uses a 120-volt outlet for independent operation, offers a compact 13.75 x 13.75 x 10.75-inch profile, and includes a glass-lined tank for durability. It is best suited for small loads like handwashing or single-sink scenarios where quick hot water matters without a full-house heater.
Reference features include its independent installation capability and easy maintenance. It is not designed to be a whole-home solution but provides an efficient, space-saving alternative for dedicated hot water points of use, contributing to overall energy savings when paired with larger system upgrades.
Orbek 14kW Electric Tankless Water Heater
Orbek’s 14kW model is designed for 240V operation with a recommended 60-amp two-pole breaker. It supplies up to 3.38 GPM, making it suitable for 2-3 points of use simultaneously. The unit emphasizes energy efficiency by separating water and electricity to reduce scale and corrosion, with hot water delivery in seconds. It is positioned as a compact, high-demand option for households seeking quick on-demand heat while managing electrical load carefully.
Consider installation requirements, including breaker capacity, wire gauge, and NPT fittings. The model supports a space-saving approach to hot water, particularly in kitchens, bathrooms, or small apartments where a full-sized tank is impractical. Self-modulation helps adapt to fluctuating water flow, optimizing energy use without compromising comfort.
APUS 27kW Tankless Electric Water Heater
This 27kW tankless unit is designed for 240V operation with a memory function and LED display. It delivers up to 6.5 GPM, making it suitable for whole-home use and simultaneous demands like multiple showers and appliances. Self-modulating technology optimizes energy consumption by adjusting heat output to demand, while the memory function preserves preferred temperatures across power cycles. The compact design is aimed at space savings with a 17.72″ x 11.42″ footprint and 3/4″ NPT connections.
Installation requires three 40-amp breakers and careful electrical planning to ensure the service panel can support the heat demand. This model is positioned for homeowners seeking high flow rates and consistent hot water across multiple uses, without the energy waste associated with traditional tank heaters that maintain temperature constantly.
Rheem RTEX-24 24kW Tankless Electric
Rheem’s RTEX-24 is a 24kW electric tankless model designed for whole-home performance with continuous hot water. It requires three 40-amp double-pole breakers and a 200-amp service recommendation to accommodate electrical load. The unit offers an ON/OFF dial and an adjustable digital temperature display with 1-degree increments from 80-140 degrees Fahrenheit. Groundwater temperature and regional water chemistry can affect feasible temperature rise and gallons per minute, so performance should be verified for geographic location.
Key considerations include electrical panel capacity, proper clearances, and compatibility with the home’s service. The self-modulating capability aligns with demand, but installation should be performed by a professional to ensure safe and efficient operation. A reliable choice for homes seeking robust, on-demand hot water with precise temperature control.
Buying Guide
- Energy efficiency and heat-up speed: Look for self-modulating technology that heats water only when required, reducing standby losses and lowering energy usage over time.
- Flow rate needs: Match the unit’s GPM capacity to your household hot water demand. Higher GPM units support multiple simultaneous uses but require greater electrical service.
- Electrical requirements: Many units demand multiple breakers and substantial service capacity. Verify panel space, conductor sizing, and local electrical codes before purchase.
- Space and installation location: Tankless options save space and can be mounted on walls. Point-of-use models are ideal for sinks or appliances, while whole-home units require proper positioning to optimize performance.
- Geographic considerations: Groundwater temperature influences achievable temperature rise. In colder climates, you may need higher-capacity units or multiple installations.
- Durability and maintenance: Glass-lined or durable elements extend life. Field-serviceable models reduce downtime and maintenance costs.
- Noise, heat dissipation, and venting needs: Electric units are generally quiet but may require ventilation if installed near enclosed spaces; consider electrical noise and heat output in compact areas.
- Compatibility with existing plumbing: Check inlet/outlet fittings (NPT sizes) and whether adapters are needed for seamless integration with current piping.
- Warranty and service availability: A strong warranty and access to service technicians can influence long-term satisfaction and total cost of ownership.