Gas water heaters come in several different models and which you choose depends on several criteria: the size of the building, building configuration, and construction are used to determine which model of gas water heater is needed for your individual situation. @home Energy will send over a qualified technician, free of charge, to help determine which style of gas water heater is best for your residential or commercial application.

The location of the gas water heater and its proximity to exterior walls or chimney are important factors when determining which style of gas water heater is going to be installed.


There are three main types of storage style gas hot water heaters:

Conventional/Natural Vent (CV/NV)

  • Used when there is an existing chimney and where the chimney can be used to vent the water heater to the outside.
  • Operation is quiet, and does not require a blower motor or electricity to operate.
  • A floor drain is recommended near the base of the tank.

Power Vented (PV)

  • Vents to the side of the house if there is no chimney.
  • Does not need to be close to an outside wall.
  • A blower motor is located on top of the water heater to vent gases to the outside.
  • Blower motor requires electricity to operate and has a mild noise.
  • A floor drain is recommended near the base of the tank.

Direct Vent (DV)

  • Used where there is insufficient combustible air or where air is unsuitable for combustion (i.e. bedroom or bathroom installations).
  • If located within a short distance of an exterior wall, it can be vented through the outside wall.
  • This unit does not require a blower motor to vent exhaust, and uses outside air for combustion.
  • This tank is quiet, and does not require electricity to operate.
  • A floor drain is recommended near the base of the tank.

For more information on how you can install tankless on-demand systems for no upfront cost, contact an
@home Energy representative to set up a home visit today!

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