Commercial condensate neutralizer tank for NPE, NPE-2, NCB-E, NCB-H, NFC, NFC-H, NHB, NFB, NFB-H, NFB-C, and NHB-H series units designed to neutralize the condensate of up to 3,000 MBTU total (15 - NPE, 10 - NFB301, 9 - NFB399). 1 year warranty from date of purchase. 1 year warranty from date of purchase.