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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.

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.