From: On Demand

The electric Tempra whole-house series comprises six tankless water heater models, from 12 kW to 36 kW, that can be installed in homes with one to four bathrooms. The smallest capacity unit has one heating module, the mid-range models have two heating modules, and the largest capacity units have three heating modules, which are all wired back separately to the electric panel. The temperature and flow sensors feed their readings into the water heater’s microprocessor control, and the microprocessor prevents the water temperature from deviating from the set point. The tankless water heaters, which the company says are nearly 100% efficient, save 15% to 20% on water heating costs compared to a tank water heater. Energy factor: 0.99. 800.582.8423.