The fuel decision is the single most consequential water heater choice — it determines operating cost, install complexity, and the path of brands to shop. Most US homes still favor gas where service is available, but electric is gaining ground through heat pump water heaters with IRA tax credits.
Operating cost comparison
| Fuel | 3-person home annual cost | 4-person home annual cost |
|---|---|---|
| Natural gas (atmospheric tank) | $200-300 | $280-400 |
| Natural gas (condensing tankless) | $170-250 | $230-340 |
| Propane (atmospheric tank) | $400-600 | $550-780 |
| Electric resistance (50-gal tank) | $420-650 | $580-850 |
| Electric heat pump (50-gal HPWH) | $130-200 | $170-260 |
Natural gas wins on operating cost over resistance electric by roughly 2-3×. Heat pump electric reverses the math — it operates cheaper than gas in most markets.
Install cost comparison
- Gas tank, like-for-like swap: $1,100-1,800 installed
- Electric tank, like-for-like swap: $1,000-1,500 installed
- Heat pump electric: $2,000-3,500 (often net lower after IRA $2,000 credit)
- Gas tankless: $3,000-5,000 (gas line + venting upgrades common)
- Electric tankless (whole-house): $1,500-3,500 plus possible service panel upgrade
When gas wins
- Existing gas service to the home with gas furnace and range
- Cold-climate winter with high simultaneous demand
- Larger households (4+ people) where recovery rate matters
- Budget priority on standard tank
- No willingness to electric-service-upgrade for tankless
When electric wins
- No gas service available (extending gas line is expensive)
- All-electric home preference (heat pump heating, EV, induction range)
- Solar PV installed or planned — electric water heater paired with solar makes sense
- Heat pump water heater with IRA $2,000 tax credit + state rebates
- Smaller home with manageable peak demand
The heat pump consideration
If you\'re shopping electric in 2026, heat pump water heater (Rheem ProTerra, AO Smith Voltex, Stiebel Accelera) usually beats gas on operating cost. Install requirements: 700+ cubic feet air space, ambient 45-95°F, condensate drain. See our heat pump water heater guide.
Decision matrix
| Scenario | Choice |
|---|---|
| Gas already plumbed, budget standard | Gas tank (Rheem Performance, AO Smith Signature) |
| Gas plumbed, want tankless | Gas tankless (Rinnai, Navien) |
| No gas, want IRA $2k credit | Heat pump (Rheem ProTerra, Stiebel Accelera) |
| No gas, smaller home, no air space for HPWH | Electric tank (Marathon lifetime composite) or electric tankless (Stiebel Tempra Plus) |
| All-electric path + solar | Heat pump water heater |
Bottom line
Gas wins on operating cost vs resistance electric. Heat pump electric reverses the equation and is the modern best-economics choice when install supports it. Tankless gas is the volume luxury upgrade. Choose by what\'s already plumbed and what your install location supports.