Beacon/morris horizontal hydronic unit heater, header type coil style, 17400 btu – hbb024 header type coil style, 24,000 btu horizontal hydronic unit heater, osha fan guard standard, approved for residential/commercial water/steam applications, 20 gauge steel casing, seamless copper tubing coil with aluminum fin design, coil brazed into extruded header junctions, etl certified at 200 ewt and 2 psi steam.