The 7.4-gallons per minute direct vent tankless gas water heater draws makeup combustion air directly from outside the residence or the business structure, rather than from the interior. This feature eliminates the need for additional provisions for combustion air on the inside, while alleviating IAQ problems. The UMC-117 remote control can be set from 100-140°F. Additional remote control thermostats are also available and sold separately. The EZ-Link™ cable connects two tankless units to operate as one unit for high-demand applications. The film wrap overheat limiter instantly detects an unsafe temperature in the heat exchanger of the water heater and immediately shuts down the unit. Two high-altitude models are available: up to 6,560- and 9,840-foot elevations.

Rheem Water Heaters, 101 Bell Rd., Montgomery, AL 36117-4305; 800-621-5622;

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