Tankless vs Tank Water Heater
**Tank heaters** store 40–80 gallons—simple and lower install cost. **Tankless** heats on demand—efficient for low/medium use but needs gas line or electrical upgrades for high flow.
Step by step
1. Peak gallons per minute
Simultaneous showers need higher GPM.
2. Compare install quotes
Venting and gas upsizing add cost to tankless.
3. Fuel type
Gas vs heat-pump tank units change economics.
Tankless vs tank
Large families may need multiple tankless units or a big tank.
- Tank: Lower upfront; standby heat loss.
- Tankless: Long life; endless hot if sized right.
Use our calculators
Common mistakes
- Undersizing GPM for two showers
- Ignoring annual flush maintenance on tanks
FAQ
Do tankless save money?
Often modest savings—install premium can extend payback.