Water-heater lifespan (years) by type
Typical published planning values — NOT a certified spec or professional advice. Efficiency, sizing and life vary by unit and installation; confirm on the EnergyGuide label and the manufacturer’s instructions. Water-heater installation, gas, venting, combustion, the temperature-&-pressure relief valve, and the scald / Legionella tradeoff of a temperature setting are a licensed plumber / gas fitter, manufacturer-instruction and local-code matter — not engineered here.
Lifespan depends on water hardness, maintenance (anode + flush) and install quality. These are LABELED planning typicals, not a warranty; confirm the manufacturer’s data. Use them with the lifespan reference and the type selector.
| Type | Typical UEF | Typical lifespan (years) |
|---|---|---|
| Gas storage tank | ~0.58–0.70 | 8–12 |
| Electric storage tank | ~0.90–0.95 | 10–15 |
| Gas tankless | ~0.80–0.95 | 18–20 |
| Electric tankless | ~0.95–0.99 | 18–20 |
| Heat-pump / hybrid | ~3.0–4.0 | 10–15 |
| Condensing gas | ~0.90+ | 10–15 |
LABELED planning typicals — not a warranty. Life depends on water hardness, maintenance (anode + flush) and install quality; confirm the manufacturer’s data and the EnergyGuide label. Snapshot: 2026-07-13.