Gas Water Heaters

Compared to electric water heaters, gas hot water tanks can provide more efficient water use and have a higher recovery rate.

When comparing gas hot water heaters, look for the following features:

Comparison Definition In Gas Powered Tanks…
Efficiency Rating The percentage of heat transfer from the energy source to your water 55-65% (Water is heated below the tank through a gas burner).
Recovery Rate The amount of hot water the tank can produce in 1 hour (with 90°F increase in water temperature) 30-40 gallons/hr
First Hour Rating The amount of hot water the tank can produce in 1 hour of continuous usage 50 gallon tank around 60 gallons
Estimated Operating Costs Cost to run the water heater per year (@ 0.50/therm)
About $120-130 per year

Safety codes for gas water heaters

  • » Adequate Venting: Gas powered water tanks vent harmful carbon monoxide (CO) that must be vented safely from your home. When replacing your tank with one smaller or larger, we may need to adjust the size of the vents to ensure proper and safe venting.


  • » Stand: Some municipalities may require your water tank be elevated on a stand, not sitting directly on the ground. Most water heaters are “FVIR” (flammable vapour ignition resistant) and don’t technically need to be elevated. However, many municipalities may still have bylaws requiring water tanks be elevated


  • » Drip Leg: Many manufacturers require that we install a sediment trap or drip leg on the gas line. This is installed as close to the inlet as possible and will help prevent moisture and debris from entering your tank firing chamber


  • » Seismic Restraints: Some municipalities require that we install seismic restraints or “earthquake straps” on your hot water tank. These straps secure your hot water tank to the wall so that in the event of an earthquake your water heater will not move around and cause any damage to its surroundings.