Sioux Corporation, the #1 supplier of water heaters to the concrete industry for over 30 years, offers a variety of water heaters to fit your application. Sioux water heaters provide instantaneous, continuous hot water supply, with no preheating and no recovery time needed. Operation is simple. A 100°F temperature rise can be reached in only 3-5 minutes (depending on unit rating). Outlet temperatures and flow rate can be held at precise levels. Water heaters are pre-plumbed and pre-wired for easy installation. Oil, LP or natural gas burners are available; or a combination burner which will burn any of the above fuels. Units are built to Section IV of ASME Code and are registered with the National Board of Boiler and Pressure Vessel Inspectors. All water heaters with the exception of the M-415 are third party approved to UL508A and CAN/CSA-C22.2 No. 14-10, ensuring that the entire control panel assembly meets the UL and CSA standards.