The Stiebel Eltron Mini™ Series tankless water heaters are economical, ultra-compact, attractive point-of-use tankless water heaters designed for consistent, low-flow, point-of-use applications. The Mini Series is most suited to applications which possess a relatively constant flow rate.  Due to its compact size, the Stiebel Eltron Mini 2.5-1 easily fits directly under a sink or an adjacent cupboard or closet, so it delivers hot water straight to the sink with almost no delay.