Snug Baseboard; Type Steam; Heating Capacity 737 to 3600 BTU/HR; Element Connection 3/4" Threaded; Enclosure Material Cast Iron; Length 4-1/2'; Depth 2-1/4"; Height 9-3/4"; Flow Rate 1 to 6 GPM; Temperature Rating 110 to 215 Deg F; Differential Pressure Rating 40 PSI at 1 GPM to 1120 PSI at 6 GPM; Options Valve Enclosure, 5-1/2" or 10" Plain Enclosure, Left/Right Hand End Cover, 4" or 10" Inside Cover, 4" Easy Angle Connector, Outside Corner Cover, Metal Extension, Assembly Clamp, Push Nipples; Working Pressure 50 PSI; Water Capacity 0.3 Gallon