For whole-house or commercial building hot water on demand, Bosch Thermotechnology offers its wall-mountable Tronic 500C and 6000C electric water heaters in kW input models WH17 (Tronic 6000C), WH27 (Tronic 6000C) and WH36 (Tronic 5000C). These compact and lightweight units deliver 97% thermal efficiency with minimal standby loss and have modulating elements that help ensure a constant gallon-per-minute output temperature for hot water comfort. The water heaters also come with a filter screen on the units’ inlet to provide enhanced scale-resistance buildup over time.