Water Heater (Tankless): lifespan, maintenance and replacement

Typical lifespan: 15–25 years (about 20 years).

Maintenance schedule

• Descale/flush with vinegar — Annually
• Clean inlet filter — Every 6 months
• Check venting system — Annually
• Inspect for error codes — Monthly

Signs it needs replacing

• Frequent error codes despite servicing
• Inconsistent water temperature
• Reduced flow rate
• Corrosion on heat exchanger
• Unit is over 15 years old

Tips

Hard water areas need more frequent descaling — consider a water softener to extend unit life.