Energy Star Qualified, Not Approved for Mobile-Manufactured Home Installation, Standing Pilot, Electronic Ignition, Electronic gas control valve, Warranty Void if Installed in Mobile-Manfuactured Home, Self-Cleaning PEX Dip Tube, Standing Pilot, Electronic Ignition, Electronic gas control valve, Ace RSC available replacement parts: drain valve Ace 44104, T&P valve Ace 4008611, Pex nipples Ace 40877 70 gallon first hour rating gallons (UED)All descriptions, images, references, features, content, specifications, and product described or depicted are subject to change at any time without notice.40000 BTU input for faster recoveryAutomatic flue damper increases efficiency opens and closes to reduce heat loss in standby modeElectronic gas control incorporates an LED status indicator that monitors and reports on system operational statusPEX dip tube, Glass-lined tank with anode rod protects against corrosionFactory-installed PEX polymer lined heat trap nipples, Factory-installed temperature and pressure (T and P) relief valve