Water heater comparison
Tankless vs Tank Water Heater: Cost Comparison
A tankless water heater heats water on demand; a tank stores it hot. Tankless costs more upfront but lasts longer and lowers bills. Here is the 2026 cost comparison.
Tankless
$2,500 to $6,000 installed
Tank
$1,200 to $3,500 installed
| Feature | Tankless | Tank |
|---|---|---|
| Installed cost | $2,500 to $6,000 | $1,200 to $3,500 |
| Lifespan | ~20 years | 8 to 12 years |
| Energy use | Lower, on demand | Higher, standby loss |
| Space used | Wall-mounted, compact | Large tank |
| Hot water | Endless, flow limited | Limited by tank size |
| Install complexity | Higher | Lower |
Tankless
- Lasts about twice as long as a tank
- Lowers energy bills
- Endless hot water
- Compact, frees up space
- Higher upfront cost
- May need gas or electrical upgrades
- Flow rate limits
Tank
- Lowest upfront cost
- Simple, cheap to install
- Proven and familiar
- Shorter lifespan
- Standby energy loss
- Runs out during heavy use
- Takes more space
The verdict
Choose a tank water heater for the lowest upfront cost and a simple swap. Choose tankless if you want lower energy bills, endless hot water, a longer lifespan, and you plan to stay in the home long enough to recoup the higher install cost.
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View on AmazonFrequently asked questions
Is a tankless water heater worth the extra cost?
Tankless costs about double upfront but lasts roughly 20 years versus 8 to 12 for a tank, and lowers energy bills. For long-term homeowners it usually pays off; for a short stay, a tank is the cheaper choice.
How much more does tankless cost than a tank water heater?
A tankless unit runs about $2,500 to $6,000 installed versus $1,200 to $3,500 for a standard tank. The gap is larger when a tankless install needs new gas line, venting, or electrical work.