NAVIEN NFB399 BOILER ONLY LP/NAT

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Modulates from 26,000-399,000 input BTU's, 338,000 max net BTU's, 97.5% AFUE efficiency rating, 11/2" NPT heating connections, 3/4" NPT gas inlet connection, 3/4" NPT condensate connection, 3" pvc exhaust and intake, Max venting: 60' 3"cpvc - 150' 4"cpvc, Includes outdoor reset, Dimensions: 32.8"Hx25.1"Wx22.3"D - 371lbs, residential warranty: 1 year labor, 5 year parts, 15 year heat exchanger, Commercial warranty: 1 year labor, 3 year parts, 10 year heat exchanger