Electric vs. Gas Water Heaters: Cost, Efficiency, and Performance Compared
Gas heats faster and costs less to operate. Electric is safer and cheaper to install. Here is the full comparison.
Safety Disclaimer
Water heater maintenance involves working with pressurized systems, scalding hot water, and potentially hazardous electrical or gas connections. Always shut off power (electric heaters) or gas supply (gas heaters) and allow water to cool to a safe temperature before beginning any maintenance. Wear appropriate safety equipment including gloves and eye protection. If you're uncomfortable with any step, contact a licensed plumber.
How Each Type Works
Gas Water Heaters
A gas burner at the bottom of the tank heats the water. Combustion gases exit through a flue pipe. Gas models require a gas line and proper venting. They heat water approximately twice as fast as electric models.
Electric Water Heaters
One or two electric heating elements inside the tank heat the water directly. No venting is required. Installation is simpler but the elements heat water more slowly.
For more on this topic, see our guide on Gas vs. Electric Water Heater Maintenance: Key Differences.
Cost Comparison
| Factor | Gas | Electric |
|---|---|---|
| Unit cost | $600-$1,800 | $400-$1,200 |
| Installation | $800-$1,500 | $300-$800 |
| Annual operating cost | $250-$350 | $400-$550 |
| Recovery rate (50-gal) | 40-50 GPH | 20-25 GPH |
| Lifespan | 8-12 years | 10-15 years |
| Energy efficiency | 60-70% (standard) | 90-95% |
The Paradox
Electric heaters are more energy-efficient (90-95% of electricity becomes heat vs. 60-70% for gas). But electricity costs more per BTU than natural gas in most regions, so gas is cheaper to operate despite lower efficiency.
For more on this topic, see our guide on Tank vs. Tankless Water Heaters: Which One Is Right for Your Home?.
When to Choose Gas
- Natural gas is available at your home
- You need fast recovery (large household, high demand)
- You want lower monthly operating costs
- You want hot water during power outages (gas models with standing pilot lights work without electricity)
When to Choose Electric
- No gas line available
- You want simpler, cheaper installation
- Space is limited (no venting requirements)
- Safety is a primary concern (no combustion, no CO risk)
- You are considering a heat pump water heater (the most efficient option at 2-3x the efficiency of standard electric)
Heat Pump Water Heaters: The Third Option
Heat pump water heaters use electricity to move heat from the surrounding air into the water, rather than generating heat directly. They are 2-3 times more efficient than standard electric heaters and can save $300+/year in operating costs. The downside is higher upfront cost ($1,200-$3,500) and they require a warm ambient environment (garage or utility room above 40°F).