The powerful Stiebel Eltron 239214 Tempra 15 Trend whole house  tankless electric water heater instantly provides hot water to up to two  medium flow sinks! This energy-efficient unit works as a 2-in-1 model  that can use 14.4 kW of power with 240V service and 10.8 kW of power  with 208V service to heat the water as it flows through the machine for  complete elimination of standby heat loss. Activated by a minimum 0.50  GPM flow rate, the Tempra 15 features an ergonomic control knob that  allows you to adjust the water temperature from 86 to 140 degrees  Fahrenheit. It has several temperature and flow sensors that feed their  readings into the unit's proprietary microprocessor control so the  temperature will never deviate from the set point.
The powerful Stiebel Eltron 239213 Tempra 12 Plus whole house tankless electric water heater instantly provides hot water to up to five low flow sinks! This energy-efficient unit works as a 2-in-1 model that can use 12 kW of power with 240V service and 9 kW of power with 208V service to heat the water as it flows through the machine for complete elimination of standby heat loss. Activated by a minimum 0.37 GPM flow rate, the Tempra 12 features an ergonomic control knob that allows you to adjust the water temperature from 86 to 140 degrees Fahrenheit. It has several temperature and flow sensors that feed their readings into the unit's proprietary microprocessor control so the temperature will never deviate from the set point.