Electric vs Gas Water Heater: Which Is Cheaper to Run?

TL;DR: A standard 50-gallon gas water heater typically costs $250 to $300 a year to run, while an equivalent electric tank runs $450 to $600 a year, mostly because natural gas is cheaper per unit of energy than electricity in most US markets. Gas units cost more upfront to install (often $150-$400 more due to venting), but usually pay that back within 2 to 3 years through lower operating costs.

_Last reviewed: July 2026 · 7 min read_

Your water heater is quietly one of the biggest line items on your utility bill, usually 14% to 18% of total home energy use, and picking the wrong fuel type can cost you hundreds of dollars a year without you noticing. If you're replacing a failing unit or building out a rental property, the electric-vs-gas decision matters more than the sticker price on the tank.

Okoniq Property Hub helps landlords log water heater install dates, warranty terms, and fuel type across every unit so replacement timing and true running costs are never a guessing game.

Which costs less to operate, electric or gas?

Gas wins on operating cost in nearly every US market. Natural gas averages around $1.20 per therm nationally, while electricity averages about 16 cents per kilowatt-hour, and because gas is measured in energy-dense therms, heating the same 50 gallons of water costs roughly 40% to 50% less with gas.

The Department of Energy estimates a standard gas storage tank heater costs $250 to $300 a year to run for a family of four, while an electric resistance tank runs $450 to $600 a year for the same household. The gap narrows in regions with cheap electricity (parts of the Pacific Northwest, for example) and widens where gas isn't piped to the property at all, which forces electric by default regardless of cost.

Does the type of water heater change how much it costs upfront?

Yes, gas units cost more to install because they need venting, gas line connections, and often a permit for the flue. A standard 40-50 gallon gas tank heater runs $1,200 to $2,500 installed, compared to $900 to $1,800 for an equivalent electric tank, a $150 to $400 premium for gas in most markets.

That upfront gap usually pays for itself in 2 to 3 years through lower monthly bills, which matters if you're planning to own the property for more than a few years. For landlords who don't already have a gas line at the property, running one can add $500 to $1,500 depending on distance from the meter, which sometimes tips the math back toward electric. If the existing unit is leaking or has failed outright, check why water pools under your water heater before assuming it needs full replacement.

How does lifespan and maintenance compare?

Both types last about the same on average, 8 to 12 years for a standard tank, but gas units tend to fail a year or two sooner due to more moving parts (burner assembly, thermocouple, venting) that can corrode or clog. Electric units have fewer components that fail, mainly the heating elements and thermostat, which makes them slightly cheaper and easier to repair when something does go wrong.

Maintenance costs run similar for both, roughly $100 to $200 a year if you're doing annual flushing and anode rod checks yourself, more if you're paying a plumber for a full service call. Gas units need an annual check of the venting and burner for safety, since a cracked heat exchanger or blocked flue can let carbon monoxide back into the home. Electric units skip that risk entirely since there's no combustion happening.

| Factor | Gas Water Heater | Electric Water Heater | |---|---|---| | Annual running cost | $250-$300 | $450-$600 | | Install cost (50-gal tank) | $1,200-$2,500 | $900-$1,800 | | Typical lifespan | 8-11 years | 9-12 years | | Recovery speed | Faster (2x electric) | Slower |

Which one should you install in a rental property?

Choose gas if the property already has a gas line and you're keeping the property for more than 3 years, since the lower operating cost outweighs the higher install price within that window. Choose electric if there's no existing gas line, if tenants pay their own utilities and you're covering the up-front cost yourself, or if you want the simpler, lower-maintenance option with fewer combustion-related safety checks.

Electric also makes sense in smaller units or ADUs where a gas line simply isn't practical, and in markets with cheap electricity where the cost gap between fuels shrinks to $50-$100 a year. Whatever you choose, log the install date and model number so you're not guessing at replacement timing years later, and while you're doing broader home maintenance planning, pair it with a look at 1-inch vs 4-inch furnace filters since both systems tend to get replaced around the same maintenance cycle.

Are tankless water heaters worth comparing here?

Tankless units, whether gas or electric, cut standby energy loss and can lower running costs by 24% to 34% compared to a tank of the same fuel type, according to Energy.gov estimates. Gas tankless units cost more upfront, $2,000 to $4,500 installed, but last longer, 15 to 20 years versus 8-12 for a tank, which changes the payback math significantly for owner-operators planning to hold a property long-term.

FAQ

Is it cheaper to switch from electric to gas water heater?

Switching saves $200-$300 a year in most markets, but if there's no existing gas line, the $500-$1,500 cost to run one can erase 2-5 years of savings before you break even.

How much does a gas water heater save per year compared to electric?

Typically $200-$300 a year for a standard 50-gallon tank, based on national average utility rates for gas and electricity.

Do electric water heaters raise your electric bill a lot?

Yes, a standard electric tank adds roughly $40-$50 a month to a typical household's electric bill, compared to $20-$25 a month in gas costs for an equivalent gas unit.

Which lasts longer, gas or electric water heaters?

Electric units last slightly longer on average, 9-12 years versus 8-11 for gas, because they have fewer components exposed to combustion byproducts and corrosion.

Is a tankless water heater cheaper than a tank in the long run?

Usually yes over a 15-20 year span, since tankless units cut standby losses by roughly 30% and last nearly twice as long as a standard tank, despite costing $1,000-$2,000 more upfront.

This is educational information, not financial advice. Talk to a licensed plumber or HVAC contractor about the right water heater setup for your specific property and utility rates.