Geyser repair or replace? How to decide by fault, age and water

Repair a geyser when the fault is the element, thermostat, thermal cut-out, relief valve, anode rod, a gasket or a fitting — that is most faults, and the parts are modest. Replace it when the tank itself is leaking or rusting through, or when it is past about eight years on hard water and has already had one element and the tank is showing rust, because the next fault is the tank. The decision is mostly about the tank, not the age on the sticker.

Faults that are clearly repairable

• Heating element failed. The most common repair. A new element, fitted with a new gasket, and the geyser is as good as it was. Descale the tank at the same time or the new one goes the same way.
• Thermostat or thermal cut-out. Small parts, quick fit, ₹399 for diagnosis and labour plus the part at MRP.
• Relief valve dripping. Replace the valve. Cheap and important.
• Anode rod worn. Replace before the tank suffers. This is the repair that prevents the replacement.
• Leak at a fitting or the element flange. New fitting or gasket, ₹350 plus the part.
• Control PCB on a digital geyser. Repairable, but the board is the expensive part on these, so ask for the quote before saying yes.

On an instant geyser, the element and the flow switch are the usual failures and both are worth doing if the unit is under five or six years old.

The one fault that means replace

Water coming from the tank body or from the bottom cover as rusty water, with no loose fitting to explain it, means the tank has corroded through. A glass-lined steel tank cannot be relined; a stainless tank with a pinhole cannot be reliably welded with an element and live terminals a hand's width away. Patching compounds last weeks. This is a new geyser, and the sooner the better — a tank leak usually starts as a drip and ends as a bathroom full of water on a day you are out.

The warning signs before the leak: rusty or brown hot water first thing in the morning, rust streaks at the bottom cover, and a rumbling tank that has never been flushed.

Age, water and the hidden cost

A storage geyser on well-maintained municipal water is good for eight to ten years. On Nellore's borewell water without a flush or an anode change it is nearer five to seven, and the pattern is predictable: the element burns out once, gets replaced, and two years later the tank leaks because the anode was gone by year three.

So when a five-year-old geyser on hard water needs an element, the honest question is: has the anode ever been checked? If not, ask the technician to look at it and at the inside of the tank through the element hole while the element is out. Clean tank, anode replaced, new element: good for years. Heavily pitted tank: fit the element if you like, but start pricing a replacement.

The efficiency argument, honestly

A new geyser is more efficient mostly because its tank is clean and its insulation is new, not because of dramatic technology changes. A ten-year-old unit, flushed, with a fresh element and the thermostat at 50–55°C, is not far behind a new one in running cost. Replace for a leaking tank, for repeated faults, or because the capacity was wrong for the family — not for a promise of a lower bill.

A simple way to decide

Situation	Usually
Any age, fault in element, thermostat, valve, gasket, fitting, tank sound	Repair
Under 5 years, tank sound, one fault	Repair
5–8 years, hard water, element failed, anode never checked	Repair, and decide from what the technician sees inside
Any age, tank leaking or rusty water from the body	Replace
Over 8 years, already had an element, rust at the bottom cover	Replace before it leaks
Installation was wrong — no earth, thin wiring, on a weak wall	Fix the installation whichever way you go

Using the visit to decide

Book the fault you see — no hot water, leaking, thermostat — and the technician diagnoses it for ₹399 or ₹350 and quotes parts at MRP before touching anything. If the answer is "the tank", you pay the visit and get a clear reason to buy new instead of a patch that fails in the monsoon. If you go that way, the old unit's removal and plumbing cap-off is ₹399, and a new installation — bracket, plumbing and electrical — is ₹699.

If you replace: three things to do differently

• Choose the size for the family, not the biggest the shop has; standby loss on a 25 L unit used by one person is wasted power every day.
• Have the installation include an RCCB check and the right wire size. Most "new geyser already faulty" calls are old wiring under a new unit.
• Put the flush and anode check in your calendar from year one. That is the whole difference between seven years and twelve.