Best 28kw Tankless Water Heater Options for Homes
Selecting a high-capacity electric tankless water heater helps ensure steady hot water for multiple fixtures. This guide reviews top 28kW-class models, highlighting how they perform, install needs, and energy efficiency. The featured units span 27kW and 36kW ranges to illustrate options for larger homes or multi-point use. Below is a quick summary table of the chosen products to compare features at a glance.
| Product | Brand | Max Output (GPM) | Notes |
|---|---|---|---|
| WINTEMP 27kW | WINTEMP | Up to 6.3 GPM | Whole-house, LED display, WiFi |
| WINTEMP 36kW | WINTEMP | Up to 8.7 GPM | Higher flow, WiFi, LED |
| ThermoMate 27kW | ThermoMate | Up to 5.27 GPM | Self-modulating, compact |
| APUS 27kW | APUS | Up to 6.5 GPM | Memory function, LED display |
| EcoSmart ECO 27 | EcoSmart | Up to 3 GPM | Digital control, climate-ready |
Note: Each unit requires appropriate electrical service and breaker configuration. Always verify local wiring, panel capacity, and code compliance with a licensed electrician before purchase.
WINTEMP 27kW Tankless Electric Water Heater
The WINTEMP 27kW model delivers up to 6.3 GPM and includes an LED temperature display with WiFi control. It uses 3 x 40 Amp double-pole breakers and 3 x 8 AWG wiring, with a recommended 250A service. Dimensions are compact for under-sink or closet installations. Self-regulating technology adjusts power with flow and temperature for energy efficiency, offering substantial savings compared with traditional tanks and supporting 2–4 usage points in many homes.
WINTEMP 36kW Tankless Electric Water Heater
The WINTEMP 36kW unit provides up to 8.7 GPM and requires a robust electrical setup: 4 x 40 Amp DP breakers and 4 x 8 AWG cabling, with a recommended 300A service. It maintains stable water temperature through self-regulation and supports multiple fixtures with reduced energy waste. Its larger capacity is well-suited for bigger households or simultaneous showers and utilities.
ThermoMate 27kW Tankless Electric Water Heater
ThermoMate’s 27kW model draws up to 114A and requires three dedicated 40A double-pole breakers, plus 3 x 8 AWG wiring. It advertises instant hot water and a flow rate around 5.27 GPM at 35°F rise. The unit emphasizes self-modulating power for efficiency and a compact wall-mounted design suitable for tight spaces in residential settings.
APUS 27kW Tankless Electric Water Heater
APUS offers on-demand hot water up to 6.5 GPM with a memory function and LED display. It requires 3 x 40A breakers and 6 x 8 AWG cabling, aligning with 240V operation. The unit emphasizes smart temperature control and a compact footprint designed for whole-home or point-of-use installations, making it a flexible option for larger households seeking rapid hot water.
ECOTOUCH 27kW Tankless Electric Water Heater
ECOTOUCH’s 27kW model provides up to 5.5 GPM with a high-amperage draw, requiring a 200A service and three 40A breakers for proper installation. It highlights smart self-modulation for energy efficiency and stable temperatures, aiming to minimize temperature swings during showers while reducing electric usage.
EcoSmart ECO 27 Tankless Electric Water Heater
EcoSmart ECO 27 is designed for climates where incoming water can be cold, with a rating suitable for around 3 GPM in typical conditions. It features digital temperature control in 1-degree increments and emphasizes compact, space-saving installation for whole-home or multi-point use, with energy-conscious operation and straightforward control.
Buying Guide
- Electrical requirements: Most 27kW units need 3x40A breakers and 8 AWG wiring; 36kW models may require 4x40A breakers and heavier service. Verify panel capacity and wiring with a licensed electrician.
- Flow rate needs: Estimate GPM needs for showers, sinks, and appliances simultaneously. Choose a model that meets or exceeds your peak demand to avoid cold-water experiences.
- Water temperature rise: Consider climate and incoming water temperature. Warmer incoming water reduces power needs; colder water increases required power to reach target temperatures.
- Installation space: Tankless heaters are compact but require proper clearance, venting (if applicable), and access for service. Plan for clean mounting and drainage as needed.
- Energy savings: Self-modulating or temperature-aware controls help cut electricity use. Compare energy-saving claims and look for models with smart features if you want remote monitoring.
- Durability and certifications: Look for ETL or UL listings and warranties. Ensure components like heating elements and sensors are designed for long-term use in your climate.
- Maintenance: Some units accumulate mineral scale. Check compatibility with local water hardness and consider a pre-filter or periodic descaling plan if advised by the manufacturer.
- Multi-point usage: If your home has multiple bathrooms or high-demand areas, select a higher-flow model or a unit pair (where code allows) to maintain stable temperatures across fixtures.
- Warranty and support: Review warranty terms and the availability of local service if issues arise. A unit with accessible customer support reduces downtime.