The cost of heating water consumes almost 20 percent of your household budget, second only to what you spend on heating and cooling your home. Despite this expense, water heaters are typically ignored until they break, leaving you with no hot water and, possibly, a flooded basement.

If your water heater is nearing the end of its useful life and you’re thinking of replacing it before disaster strikes, you’ll be happy to know that you have better choices, thanks to recent federal regulations that require water heaters to be more energy-efficient. New storage tank water heaters are required to operate more efficiently, and tankless (on-demand) water heaters are even more efficient than that.

Top 10 40 Gallon Gas Water Heater

Bestseller No. 1
A.O. Smith GCR-40 ProMax Plus High Efficiency Gas Water Heater, 40 gal
6 Reviews
A.O. Smith GCR-40 ProMax Plus High Efficiency Gas Water Heater, 40 gal
  • Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
  • Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas...
Bestseller No. 2
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas
304 Reviews
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas
  • 140,000 BTU. Voltage: AC 120V
  • 6.6 GPM max flow rate. Water connection location- bottom
Bestseller No. 4
Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare...
15 Reviews
Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare...
  • Modulates heat output in response to the flow rate of water running through the unit.
  • Power vented directly vertically (rooftop) or sideways (wall) via Stainless Steel CAT III Flue 3.5" Diameter...
Bestseller No. 5
Bradford White 40 Gallon Natural Gas Water Heater #RG240T6N
11 Reviews
Bradford White 40 Gallon Natural Gas Water Heater #RG240T6N
  • Bradford White ICON System
  • Advanced ScreenLok® Technology Flame Arrestor Design
Bestseller No. 6
40 Gal Gas Water Heater w/ Flex Line Connectors & Ball Valve - See Shipping Promotion Below
1 Reviews
40 Gal Gas Water Heater w/ Flex Line Connectors & Ball Valve - See Shipping Promotion Below
  • WATER HEATER PACKAGE - You get even more with our water heater offerings. This package includes a 40 gallon...
  • SHIPPING SPECIAL - We are offering a special on shipping for residents of: Arizona, California, Colorado,...
Bestseller No. 7
Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) -...
16 Reviews
Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) -...
  • Endless hot water
  • Direct replacement for existing 40 gal tank water heater
Bestseller No. 8
Eccotemp fvi12-NG FVI-12 Natural Gas, 3.5 GPM, High Capacity Tankless Water Heater, White
147 Reviews
Eccotemp fvi12-NG FVI-12 Natural Gas, 3.5 GPM, High Capacity Tankless Water Heater, White
  • Whole home indoor, gas powered tankless water heater, rated at 3.6 GPM that activates only when in use, making...
  • For indoor installation with safe, efficient power ventilation and perfect for any small home, cabin or...
Bestseller No. 9
Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas
69 Reviews
Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas
  • Outside installation only; Includes internal freeze protection
  • 19,500 - 140,000 BTU/hr
Bestseller No. 10
Rinnai RL94IN Tankless Water Heater 9.4 GPM RL94iN-Natural Gas 9.4 GPM
99 Reviews
Rinnai RL94IN Tankless Water Heater 9.4 GPM RL94iN-Natural Gas 9.4 GPM
  • 9,900 - 199,000 BTU
  • Comes standard with MC-91-1US Digital Controller with Error Code Indicator

Consider Capacity

Tank water heaters typically hold 40, 50, or 55 gallons or more. The size you buy depends on the number of people living in your home and your peak water usage. A family of four, for instance, might take several showers, run the dishwasher, and wash a load or two of laundry in an average day, totaling 100 gallons of hot water or more. But that doesn’t mean that the household needs a 100-gallon storage tank.

Features to Consider

Warranty: Coverage for water heaters typically runs three to 12 years. While you’ll usually pay a bit more for longer-warranty models, we’ve found that they tend to have larger elements or burners that can speed up water heating and have thicker insulation for less heat loss. Choose a water heater with the longest warranty available.

Anti-scale devices: Some brands advertise features that are supposed to reduce the buildup of mineral scale at the bottom of the tank by swirling the water. While the scale can shorten the life of the heating element, you don’t need to invest in fancy features to get a water heater that lasts. Just look for one with a 12-year warranty, which typically includes a longer or thicker element.

Brass vs. plastic drain valves: These are situated near the base of the water heater for a garden hose that drains the heater. Look for brass drain valves, which are more durable than plastic.

Glass-lined tanks: Designed to reduce corrosion.

Digital displays: Help you monitor levels and customize operation. Some electric/heat pump hybrid water heaters let you set a vacation mode that uses just the heat pump for added efficiency when you’re away. Displays on solar water heaters often show tank and collector temperatures, along with pressure readings and other info.

Saves Time with Tankless Water Heater

Conventional hot water heaters need time to recharge when the hot water is depleted in the tank. If you are using tankless technology, then waiting for hot water will never be an issue. The hot water from the unit installed in a residential home allows multiple water sources to be used at once. You can easily use your washing machine, dishwasher, or another hot water source while taking a bath or a shower. The best aspect to keep in mind is running out of hot water will never be an issue.

The efficiency of the Tankless Water Heater

Energy-efficiency is becoming more and more important for consumers. The technology available with any tankless hot water heater will be a great option. Many units will have one or two heat exchanges, which are able to provide the maximum amount of efficiency. Another thing to keep in mind is meeting standards for Energy-Star qualification. Tankless units will use 40 percent less energy than conventional units.

Saving Energy

Tankless units save energy by not needing to keep water heated in a tank. Conventional units will need to run occasionally to keep water heated to at least 120 degrees. This will reduce the energy being used and will help reduce monthly utility bills for a homeowner. There is no standing pilot light needed as a unit will have an electronic ignition.

Smart Investment

Investing in a tankless water heater is a great way to increase the value of your home. Many buyers are looking for added features and are willing to pay more for various conveniences. Homeowners often have an assortment of tax credit and rebates that are available for energy-efficient products. Tankless water heaters are a good investment for some.

Less Waste

Conventional water heaters that are replaced often means the material is taken to a landfill. A tankless unit has parts that are recyclable and will result in less waste being taken to landfills. Another aspect with a tankless unit is they will have a longer lifespan than a conventional unit. Tankless water heaters have a lifespan of up to 20 years or more.

Tankless Water Heater Low Emissions

Tankless units produce lower CO2 emissions. This will help contribute to a healthier home and cleaner air that will have a positive effect on the environment.

The installation of a tankless hot water heater in a residential home is a great option for lowering utility bills by decreasing energy use. One aspect to keep in mind is the installation is often higher but will be recouped in just a few years.

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