www.pmmag.com/articles/86904-residential-gas-high-input-direct-vent-water-heater

Residential Gas - High-Input, Direct-Vent Water Heater

May 31, 2001
Bradford White Corp. announced the introduction of its new residential gas - high-input, direct-vent water heater. Available in 50-, 65- and 75-gallon capacities, this new water heater uses a telescopic, coaxial (pipe inside a pipe) venting system with a heavy-duty aluminum inner wall and a galvanized outer wall. The air for combustion is introduced through the outer pipe and the products of combustion are exhausted through the inner pipe.

Circle 17