A geyser sits ignored for eight months, then gets switched on in November and left on all day. That is exactly when the faults that were building quietly turn into leaks, shocks and tripped boards.
Every year the pattern repeats. The first cold morning arrives, somebody switches the geyser on for the first time since February, and within a week we are taking calls about water heaters that trip the MCB, leak down the wall, or heat half-heartedly and then not at all.
None of that is bad luck. A geyser is a metal tank full of water with a heating element and mains electricity inside it, and it has been standing idle in a damp bathroom all monsoon. It deserves five minutes of attention before it goes back into daily service.
Do these checks before you switch it on
1. Look at the tank and the wall behind it
Stand back and look at the unit and the wall and ceiling around it. Rust streaks running down the casing, a damp patch on the wall, flaking paint beneath the geyser, or white mineral crust around the pipe joints all point the same way: water is getting out somewhere it should not. Mark the date on the wall stain so you can tell later whether it is growing.
2. Check the earth connection and the socket
A geyser must be on a properly earthed connection. This is not optional advice. It is the appliance most likely to give a serious shock, because you are standing on a wet floor with wet hands when you use the water it heats.
Look at the plug and socket too. A scorched, melted or discoloured socket, or a plug that feels warm, means the connection is loose and arcing. That needs fixing before the geyser is used again, not afterwards.
3. Confirm it has its own MCB
A geyser draws a lot of current. It should be on a dedicated MCB of the correct rating, not sharing a circuit with lights and sockets. If your geyser trips the main whenever it runs, that is a warning being given to you — usually it means either the element has failed and is leaking current to earth, or the circuit is undersized.
4. Test the isolation switch
Most bathrooms have a pull-cord or wall switch that isolates the geyser. Check it works, and that the indicator lamp goes off with it. If you cannot cut the power to the geyser from outside the bathroom, get that sorted.
5. Run it once and watch it
Switch it on and stay for a few minutes. You should hear nothing dramatic. Rumbling, knocking or a kettle-like boiling noise from a storage geyser is the sound of scale on the element — water is boiling under the deposit rather than heating the tank evenly.
Do not ignore this one: if you ever get even a mild tingle from the tap, the shower or the geyser body, switch the unit off at the MCB and stop using it. A tingle means current is reaching the water or the casing. That fault does not fix itself, and in a wet bathroom it is genuinely dangerous.
Scale is why geysers fail here
Groundwater across much of Rohtas and Kaimur is hard, and in many areas it carries iron as well. In a storage geyser, the heating element sits directly in that water and is the hottest thing in the tank, so it is where minerals come out of solution first.
A scaled element behaves in a recognisable way. The water takes longer to heat than it used to. The element runs hotter and hotter under its insulating jacket of deposit, until the sheath cracks and the element fails — often taking the thermostat's trust with it, and sometimes tripping the MCB as current finds earth.
Scale also settles as sediment in the bottom of the tank, which is where corrosion starts. That is why a geyser in a hard-water area benefits from being drained and descaled periodically rather than being left sealed for years. The anode rod inside a storage tank, which is there to corrode instead of the tank, is also a part worth checking during service — once it is gone, the tank itself starts to go.
The common faults, and what they mean
Water does not get hot at all
Usually a failed heating element or a failed thermostat. Both are replaceable parts on most storage geysers and this is routine work. If the indicator lamp does not even come on, check the isolation switch and the MCB first — sometimes it really is that.
Water gets warm but never hot
Often a thermostat that has drifted or a partly failed element. It can also be heavy scale slowing heat transfer. On a two-element unit, one element having failed gives exactly this symptom.
Water gets scalding hot and the geyser will not cut off
The thermostat is not cutting off, and this is a fault to take seriously. Switch the unit off and get it looked at. A storage geyser also has a pressure relief valve as a second line of defence, and that valve must never be plugged, capped or tied shut, whatever a plumber may suggest to stop it dripping.
Water leaking from the tank
Distinguish between a dripping joint or valve, which can be repaired, and water weeping from the body of the tank itself, which cannot. A tank that has rusted through is the end of that geyser. There is no patch worth doing on a pressure vessel full of hot water sitting above a bathroom door.
The MCB trips whenever the geyser runs
Treat this as an electrical fault, not an inconvenience. It most often means a failed element leaking current to earth. Do not switch the MCB back on and carry on using it.
Instant or storage — which suits you
People often ask whether to replace a failed storage geyser with an instant one. They solve different problems.
| Instant (tankless) | Storage | |
|---|---|---|
| Best for | Kitchen sink, single washbasin, short use | Bathing, bucket use, a family in sequence |
| Hot water available | Continuous, but a low flow at a time | A tank's worth, then it must reheat |
| Waiting time | Almost none | Needs heating up first |
| Space | Small, fits a tight bathroom | Needs a strong wall and clearance |
| Effect of hard water | Scale narrows the internal waterway | Scale on element and sediment in tank |
| Electrical load | High while running | Moderate, but for longer |
In most homes here, a storage geyser suits the bathroom and an instant unit suits the kitchen. An instant geyser will not fill a bucket quickly, and people who buy one expecting it to are usually disappointed.
When repair stops being sensible
An element, a thermostat, a valve, a thermal cut-out, a leaking connection — all of these are normal repairs and worth doing on a sound unit. Replace rather than repair when the tank body itself is leaking or rusted through, when the inner tank has been repaired before, when the unit trips repeatedly even after the element has been changed, or when the outer body is so corroded that it is unsafe on its bracket. We will tell you plainly which side of that line your geyser is on.
Getting it looked at
The sensible time for a geyser service is October, before the cold sets in and before the Chhath and Diwali rush, when every house in Sasaram is having work done at once. A service covers draining and descaling where needed, the element and thermostat, the relief valve, the connections, the earthing, and the mounting bracket.
Charges for geyser service, element and thermostat replacement and installation are on the rate list, with GST extra and spare parts billed at actual cost after we tell you what is needed. The rest of what we handle is on the services page, and you can reach us on +91 96315 11974, 8:00 AM to 6:30 PM, any day.
We cover Sasaram, Dehri-on-Sone, Bikramganj, Bhabhua and Aurangabad among others — the full list is on the service areas page.
Frequently asked questions
Most often the heating element has failed and is leaking current to earth, which is exactly what the MCB is there to catch. It can also mean the geyser is sharing an undersized circuit instead of having its own correctly rated MCB. Either way, do not keep resetting it and using the geyser — get it checked.
It is not a good idea. A geyser left on cycles the thermostat all day, keeps the element under constant thermal stress, and wastes power heating water nobody is using. Switch it on twenty to thirty minutes before bathing and off afterwards. It also means the unit is not live and unattended for hours.
It depends where from. A drip at a pipe joint, an inlet or outlet connection or the relief valve can normally be repaired. Water weeping from the body of the tank itself means the tank has rusted through, and that cannot be patched safely. A hot, pressurised tank mounted on a bathroom wall is not something to improvise on.
For bathing, a storage geyser almost always suits better, because it holds a tank of hot water ready and fills a bucket quickly. An instant geyser gives continuous hot water but only at a low flow, which makes it a good fit for a kitchen sink or a single washbasin rather than a bathroom.
Want a hand with this?
Book a technician at home across Sasaram, Rohtas, Kaimur and Aurangabad. Prices fixed up front, a bill for every job.