Best Electric Tankless Water Heaters for Commercial Use
Electric tankless water heaters offer compact, scalable hot water solutions for small businesses, offices, and light commercial settings. This guide compares top models, highlighting capacity, efficiency, installation needs, and control features to help facility managers choose reliable, energy-saving options. The following selections are drawn from well-known brands and are suitable for point-of-use to whole-building applications where 240V circuits and adequate electrical service are available.
Summary of Selected Products
| Product | Brand | Approximate Output | Key Feature |
|---|---|---|---|
| WINTEMP 36kW Tankless Electric Water Heater | WINTEMP | Up to 8.7 GPM | WiFi control; auto temperature stabilization |
| Rheem RTEX-24 24kW | Rheem | Up to 4.4 GPM | External digital thermostat; self-modulation |
| EcoSmart ECO 11 | EcoSmart | Up to 2.68 GPM (11 kW / 240V) | Compact, energy-efficient, 99% thermal efficiency |
| ECOTOUCH 14kW ECO140S | ECOTOUCH | Up to 3.38 GPM | Self-modulating; 240V; ETL certificated |
| VEVOR 36kW Tankless Electric | VEVOR | Multiple outlets; 30-60°C output | LCD touch screen; security lock |
WINTEMP 36kW Tankless Electric Water Heater
The WINTEMP 36kW model is designed for whole-house supply with a maximum hot water output of 8.7 GPM. It uses self-regulating, responsive power to maintain a stable temperature across varying flow rates. Installation requires a robust electrical service: four 40 Amp double-pole breakers and appropriate gauge wiring, with a recommended 300A household power supply. Dimensions are 13.7” wide, 21.1” high, and 5.3” deep, with 3/4″ NPT water connections. Features include an LED temperature display and WiFi control for remote monitoring and adjustments. It aims to minimize energy use when flow falls and to deliver consistent shower temperatures, even in multi-point usage scenarios.
Rheem 18kW 240V Tankless Electric Water Heater
Rheem’s 18kW option emphasizes a compact footprint with an external digital thermostatic control that provides ±1 degree accuracy. It uses self-modulation to adjust power as demand changes and includes durable copper immersion heating elements that are field serviceable. Its typical flow performance reaches up to 4.4 GPM, making it suitable for small-to-medium point-of-use installations or compact commercial spaces where multiple fixtures may require steady hot water. The combination of precise digital control and serviceability supports ongoing reliability in busy settings.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater
Rheem RTEX-24 is a 24 kW unit designed for larger homes or light commercial loads. It requires three 40 Amp double-pole breakers and a 200 Amp service recommendation to ensure adequate headroom. Its performance is rated for continuous hot water and is sensitive to groundwater temperature, which can affect temperature rise and GPM. An ON/OFF dial with an adjustable digital temperature display allows precise settings from 80 to 140 degrees Fahrenheit. This unit emphasizes robust electrical planning and reliable performance across varying climates and usage patterns.
Rheem 11kW 240V Tankless Electric Water Heater
This 11kW Rheem unit targets smaller loads, delivering up to 2.68 GPM with a compact footprint. An ON/OFF dial combined with a digital temperature display provides straightforward control. Self-modulating power helps conserve energy by matching heat output to demand. It’s well-suited for under-sink applications, offices with limited hot water needs, or multi-point-of-use configurations in small commercial settings where space and electrical capacity are constrained.
EcoSmart ECO 11 Electric Tankless Water Heater
EcoSmart ECO 11 is a compact, 13 kW, 240V model designed for point-of-use or small installations. It claims up to 2.68 GPM and emphasizes energy efficiency with 99% thermal efficiency and 90% space savings versus traditional tank heaters. The unit’s self-modulating technology adjusts energy use to demand, and its small dimensions (11.5 x 8 x 3.75 inches) fit tight spaces. It is suitable for light commercial applications such as offices, small clinics, or multi-suite settings needing a dependable, space-saving hot water solution.
ECOTINYMACH Tankless Water Heater Electric 110V
ECOTINYMACH’s 110V unit targets scenarios where a full 240V circuit is unavailable or where a dedicated heater is needed under sinks or small spaces. It provides instant warm water without storage and emphasizes space-saving design. The model’s 110V operation makes it easier to install in retrofits or micro-commercial applications, though it may deliver lower flow rates than higher-voltage models. Remote operation support adds convenience for frequent adjustments in busy settings.
ECOTOUCH 14kW 240V ECO140S Tankless Water Heater
ECOTOUCH ECO140S provides 14kW at 240V with up to 3.38 GPM, designed for 2–3 point-of-use fixtures or a compact whole-space setup. It requires careful sizing: 60A double-pole breaker and 6 AWG/2 wiring to ensure safe operation. Notable features include a smart heating chip that maintains stable temperatures by monitoring usage up to 20,000 times per second, leakage protection, and ETL certification. This unit balances compactness with reliable performance for light commercial applications.
VEVOR Tankless Electric Water Heater, 36kW
The VEVOR 36kW model targets larger loads with a high-capacity heating system that can deliver 30–60°C (86–140°F) quickly. It includes an LCD touchscreen for real-time temperature monitoring and a security lock for controlled access in shared facilities. System architecture emphasizes the separation of water and electrical components to reduce scale buildup and leakage risk. Installation requires careful electrical planning to support a high-power unit, but it offers strong performance for medium-to-large commercial spaces or facilities with multiple hot water fixtures running simultaneously.
Buying Guide: Key Purchase Considerations
- Voltage and electrical service: Most units run on 240V; some offer 110V options for smaller or retrofit projects. Verify available breaker capacity, wire gauge, and overall service headroom before selecting a model.
- Flow rate vs. climate: GPM ratings depend on incoming water temperature. Colder climates reduce effective flow; higher-wattage units can compensate, but electrical upgrades may be needed.
- Self-modulation and control: Self-modulating units adjust heat input automatically to save energy. Digital thermostats and remote monitoring add convenience for facilities management.
- Space and installation: Tankless heaters save space but require proper clearance, venting (where applicable), and secure mounting. Some models emphasize compact design for under-sink or point-of-use installations.
- Maintenance and serviceability: Look for units with field-serviceable elements and clear accessibility for routine checks. Copper immersion elements tend to be durable in commercial settings.
- Electrical safety and certifications: ETL or UL certifications, leakage protection, and over-temperature safeguards are important for commercial compliance and user safety.
- Point-of-use vs whole-building suitability: For offices or light commercial spaces, determine whether you need multiple smaller units or a single higher-capacity model to cover the expected peak load.
These options provide a range of capacities, from compact point-of-use units to higher-capacity models suitable for multi-point hot water needs. When selecting, align the unit’s electrical requirements with existing service and plan for future expansion if business needs grow. Always consult a licensed electrician or plumbing professional to confirm installation compatibility and safety compliance.