Stiebel Eltron DHC Classic tankless water heaters are designed for installation at the point-of-use. The DHC Classic heats water instantaneously as it flows through the unit. Stand-by heat losses are completely eliminated. The heating element is controlled by a flow switch which means a DHC Classic can never dry-fire and fail prematurely. And since all DHC Classics are hydraulically controlled, operation is quiet. DHC Classic water heaters are equipped with a safety high-limit with manual reset. The rugged all copper design ensures many years of reliable service.