399MBH TFTN Firetube Boiler 10:1 Turndown, Nat Gas, 95.4% AFUE, WiFi Monitoring, EZ Setup Wizard , Remote Diagnostics Full-Color Display, Top/Bottom Plumbing, Low Water Cutoff , 120V Outlet , 3+DHW Zones (Expandable), 250 lbs, 6.4 Gal Water, 1-1/2" mNPT Water, 3/4" Gas, 4" Vent, 21-1/4"D x 25-1/4"W x 36-1/2"H (LIMITED LIFETIME WARRANTY) | B2B Storefront