The Marey Power Gas naturally drafting gas tankless water heaters model GA5L/GA10L/GA16L are good for up to 6,000 ft elevation. There are many people running the units at even higher elevations and the units will still operate well. The air and gas mix at higher elevations will cause sooting in the heater exchanger and flue exhaust so this wants to be checked periodically. You have to be aware that you will also loose 4% of your heat rise for every 1,000 ft above sea level... this is applicable to all gas appliances.
For further questions or to order a Marey tankless water heater please call GlobalTowne at 888-726-9752
