Amtrol® BoilerMate® Indirect-Fired Water Heater, Mechanical Control, Series: Champion®, 100000 Btu/hr Heating, 41 gal Tank, 4 gpm at 6 ft, 3/4 in NPTF Top Gas Connection, 3/4 in NPTF Water Connection, 150 psig, 150 deg F, Ultra Low Nox: No, Deep Drawn Steel Shell, High Gloss, Blue, 22 in Dia x 48 in H, Domestic