What is Tank lining & anode rod?
Glass/vitreous enamel coating plus a sacrificial magnesium rod.
Short answer
Ask if the anode rod is replaceable and how often (typically every 2–3 years).
Tank lining & anode rod when buying a water heater (geyser)
Glass/vitreous enamel coating plus a sacrificial magnesium rod.
Why it matters: Hard Indian water corrodes tanks; the anode rod dies first and protects the tank.
Look for: Ask if the anode rod is replaceable and how often (typically every 2–3 years).
Full Water Heater (Geyser) buying guide