essure 11" WC (2.73 kpa) Manifold Pressure 10" WC (2.49 kpa) Orifice Size 453 DMS Maximum Input 25.500 Btuth (7.47 kW) Minimum Input 21.000 Btuth (6.15 KW) HIGH ELEVATION This unit is approved for altitude 01o4500 ft. (CAN.' 2.17-M91). GAS LINE INSTALLATION Since some municipalities have