Used 500HP Waste Heat Recovery Scotch Boiler. Manufactured by Hurst Boiler. MAWP 150PSI Steam. 17250 PPH output. 3623 Sq Ft Heat Surface. Serial #HRB3623-150-1. National Board #21467 Built 2016. Deaerator Skid rated MAWP 50 @300F. Serial #1600170DA. National Board #21463. Built 2016. Controls with NEMA 4 enclosure.