Characteristics of Natural Gas Hot Water Heaters, Their Plusses and Minuses
The natural gas hot water heater is the standard tank type, which supplies hot water by heating the water in a tank installed in a housing unit. The water is heated according to a temperature setting which is specified and controlled by the owner or manufacturer.
Advantages
This type of water heater can provide hot water at a rate of 40 to 50 gallons to a residential unit. Smaller or larger hot water heater models are available based on intended use. The efficiency rating of this water heater is 80%. For more economic applications, high efficiency models are also available in the market.
Disadvantages
As this type of water heater needs to be vented, it has more requirements
and can thus take up more space compared to its counterparts. It needs a stainless steel, standard B-vent or PVC for ventilation purposes based on manufacturer-specified venting materials. This may also be equipped with a power vent for forced venting necessities. To avoid warranty and error code problems, the installer has to check and make sure it is properly vented.
Best Brands of Natural Gas Water Heaters
Most installers highly recommend Bradford White as it is made with a new gas valve that is very easy to use. A spark igniter, an oxygen depletion safety gauge, a high limit switch, and a diagnostic light complete the setup.
The Rinnai and Rheem brands are also recommended. Other brands include Ruud, Richmond, GE, and A.O.Smith.
The Tankless Type of Natural Gas Water Heater
If you want endless hot water when you need it, a tankless water heater would be a good option. The tankless type, which also needs ventilation, is more expensive than the traditional tank. A 30% tax credit may ease the burden. However, when it breaks down, its repair will also be expensive and its parts are exclusive.
Other Water Heaters
Another option is the electrical type of water heater. When there is limited 
space and overall maintenance requirements and cost are considered, most households go for the electrical type of water heaters. Energy cost, however, may be higher than the natural gas tank and tankless types.
Ultimately, when choosing a water heater, the most efficient source of energy in the area must be considered first. All water heaters must also be of the correct size for the demand that they must meet during peak periods of requirement.