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BUT…

Installations at higher altitudes require special consideration In both BTU inputs and recovery rates.

Industry standards recommend that each gas appliance input rate should be reduced at a rate of 4% for every 1,000 feet above 2,000 feet (this should be taken into consideration when ordering equipment).

Example:
A water heater with a firing rate of 199,000 BTU's, installed at 4,000 feet above sea level, should be derated by 8% or 183,000 BTU's.

Recovery reduction should also be taken into consideration when sizing applicationswhere elevations are above 2,000 feet above sea level (see chart below).

Example:
A water heater with a 211 GPH recovery rate, installed a 4,000 feet above sea level.

Multiplying the recovery rate (211 GPH) by the appropriate percentage factor (.84) will give the corrected recovery rate: 211 GPH x .84 = 177.24 Corrected Rate

The new recovery rate should be evaluated to determine if it will fill the hot water demand for the application.