Designed to fit directly onto your Air Handler;Heavy duty cabinet made of rust-proof aluminum;Baked enamel finish for a polished look;Fully insulated with high "R" rigid foam;Uses any hot water source with sufficient BTUH;Heat output easily adjusted to meet requirements;Optional 230-volt or 115-volt circulation pump for easy connection to air handler wiring/controls;Optional water lubricated, low wattage circulation pump requires no maintenance;Optional "No Lead" valve kit with full-port ball valves, bleed ports and swing check valves Optional Air Handler return-side configuration;Design Certified and Listed to meet UL and CSA Standards;Tested to comply with ANSI/NSF 61-2012;3-Year Limited Warranty;14-1/4" X 22" x 8"