40 gallon capacity, natural gas, 909 Series, 40,000 BTU, 2" foam insulation/R-value 16.00, .62 Energy factor, sediment reducing dip tube, factory installed T&P valve AHRAE 90A-1980 approved, rated up to 10,100'. Meets flammable vapor and NAECA codes, BOCA approved, standard thermocouple, door mounted TCO, manual reset. Glass lined tank. Unit dimensions: 61-1/2" H. x 20" D. Height measured to the top of the draft hood. Warranty: 9 year tank/parts. 1 year labor.