The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater | Building America Solution Center
![BRADFORD WHITE RG250S6N 50MBTU 50 GALLON SHORT ENERGY SAVER ATMOSPHERIC VENT NATURAL GAS RESIDENTIAL WATER HEATER 60-1/2 HEIGHT 22 DIAMETER WITH T&P VALVE 6 YEAR WARRANTY at Shop with Lee Dopkin BRADFORD WHITE RG250S6N 50MBTU 50 GALLON SHORT ENERGY SAVER ATMOSPHERIC VENT NATURAL GAS RESIDENTIAL WATER HEATER 60-1/2 HEIGHT 22 DIAMETER WITH T&P VALVE 6 YEAR WARRANTY at Shop with Lee Dopkin](https://webassets.hajoca.com/images/671632/67163279464.jpg)
BRADFORD WHITE RG250S6N 50MBTU 50 GALLON SHORT ENERGY SAVER ATMOSPHERIC VENT NATURAL GAS RESIDENTIAL WATER HEATER 60-1/2 HEIGHT 22 DIAMETER WITH T&P VALVE 6 YEAR WARRANTY at Shop with Lee Dopkin
![G102-40T35R - 40 Gallon Atmospheric Vent Natural Gas Water Heater - 10 Year Warranty | American Water Heaters G102-40T35R - 40 Gallon Atmospheric Vent Natural Gas Water Heater - 10 Year Warranty | American Water Heaters](https://resources.whmaas.com/images/american/Proline/American-ProLine-Atmospheric-Vent-Tall-Gas-Water-Heater.png)