Quick answer
- Tankless: endless hot water, ~20-yr life, higher upfront
- Tank: lowest upfront cost, ~8–12 yr life
- Tankless saves space and standby energy
- Hard water makes maintenance important for either
When this applies
Use this when your heater is failing
Replacement is the moment to decide whether to switch to tankless or stay with a tank — the install requirements differ.
Your options
Tankless
On-demand hot water, compact, long-lived, lower standby losses. Higher upfront cost and may need gas/venting or electrical upgrades.
Storage tank
Lowest upfront cost and a straightforward swap. Finite hot water, larger footprint, and a shorter lifespan.
What to watch out for
Skipping maintenance on hard water
Local hard water scales both types. Tankless units especially need periodic descaling — pairing with a softener protects the investment.
Schedule service
Frequently asked questions
Is tankless worth the extra cost?
If you value endless hot water and plan to stay in the home long enough to benefit from the longer lifespan and energy savings, usually yes. We'll show both installed costs.
Keep exploring
Reviewed by John Stevenson Plumbing, Heating & Air. Based on installed-cost and lifespan comparisons plus local hard-water maintenance needs. Last updated 2026-06-18.