Leslie Controls has introduced its LES Series steam-fired water heater. The LES Series provides an economical, high-capacity output using steam or hot water as the heating source. Options include double wall tubing and stainless steel construction. Units are compact in design, allowing them to pass through most doorways, and are offered in vertical and horizontal constructions. The LES Series is a completely pre-piped system, with all components sized and mounted prior to shipment.