Key Takeaways
- Most botched installs I see fail before a single screw goes in, the prep was skipped, not the fitting.
- Confirm three things first: the tank suits the space and family, the wall or floor can carry a full tank, and a correct dedicated electrical point with earthing exists.
- Have every valve, fitting, and tool ready on the day so you are not stopping halfway to run to the shop with the water off.
- Never skip the pressure relief valve, the isolation valve, or the earthing, these three are the difference between a safe install and a risky one.
Ask any fitter and they will tell you the same thing: the job is won or lost before you start. I have arrived at homes where the new geyser sat in its box for a week because nobody checked the point had earthing, or the wall turned out to be hollow block, or the isolation valve was missing from the kit. None of that is hard to avoid, it just needs a proper once-over first. By the end of this checklist you will know exactly what to confirm, buy, and lay out before you touch the tank, so the install itself goes smoothly and safely.
This checklist pairs with our complete guide to water heater installation, which walks through the actual fitting steps once your prep is done.
Before you buy: is the geyser right for the space?
The first checks happen at the shop, not the bathroom. Getting these wrong means returns or regret.
- Capacity matches the household. A couple manages on 10-15L; a family that wants back-to-back bucket baths or a shower needs 25L or more.
- Type suits your water. Hard water areas need a glass-lined or anti-corrosion tank and a sacrificial anode rod to fight scale and rust.
- It carries the ISI mark and a sensible BEE star rating, the marks that tell you it meets Indian safety and efficiency norms.
- The shape fits the spot. Vertical for a normal wall, horizontal only if you must tuck it above a false ceiling.
Measure the intended spot before you leave home. I have seen a perfect geyser go back simply because it fouled a shelf or a door swing by a few centimetres.
The wall and location check
Where the tank hangs decides both safety and convenience. Walk the bathroom with these in mind.
- Wall strength: knock on it. A dull thud means solid brick or concrete and an easy fixing; a hollow ring means you need special anchors or a floor stand.
- Full-tank weight: remember a filled 25L tank loads the wall with 30 kg-plus. Size anchors for the full weight, not the empty unit.
- Clear of the shower: position the tank and its controls away from direct spray and the wettest zone.
- Serviceable: leave room to reach the connections, the relief valve, and the element cover later.
- Drain path: make sure the pressure relief valve can discharge safely without dripping onto electricals or a walkway.
Tip: Before drilling, check there is no concealed wiring or plumbing behind your marks. A cheap wall scanner, or simply keeping clear of switches and taps, avoids the nasty surprise of a live cable or a burst pipe mid-install.
The electrical check (the one people skip)
This is the part that gets rushed and the part that matters most. Confirm every point below before install day.
- Dedicated point: the geyser needs its own line, typically a 16A point, not a socket shared with other appliances.
- MCB or ELCB in place: ideally an ELCB or RCCB that trips on earth leakage, protecting against shock.
- Proper earthing: confirm the point is genuinely earthed. This is invisible when missing and the single most important safety item.
- Right cable size: the wiring must be rated for the geyser’s load, or it will overheat.
If any of these are missing or you are unsure, get a licensed electrician to sort the point before you fit the tank. This is not a corner to cut. For the full connection walkthrough, see our step-by-step on how to install an electric geyser.
Warning: Turn off the power at the MCB before doing any electrical work, and never energise a geyser that is not properly earthed. A fault can make the metal body live, and without an earth path and a working ELCB, the first person to touch a wet tap becomes the path instead.
Parts and tools to have ready
Nothing stalls an install like discovering a missing fitting with the water already off. Lay all of this out before you begin.
| Item | Why you need it |
|---|---|
| Mounting bracket & wall anchors | To hang the tank; anchors matched to your wall |
| Isolation / stop valve | To shut off water for future servicing |
| Pressure relief valve (PRV) | Non-negotiable safety valve, releases excess pressure |
| Flexible connection hoses | Neat inlet and outlet connections |
| Thread seal tape | To seal threaded joints leak-free |
| Hammer drill & masonry bit | For fixing the bracket into brick or concrete |
| Spirit level & spanners | To hang it dead level and tighten fittings |
The three items people most often forget are the isolation valve, the pressure relief valve, and enough thread tape. For the full kit, our guide to the tools you need to install a water heater covers everything.
Your pre-install checklist, in order
Run through these on the morning of the job. If any line is a “no”, stop and fix it before you start.
- Right geyser: correct capacity, tank type for your water, ISI mark, sensible star rating.
- Spot confirmed: measured, clear of the shower, serviceable, with a safe drain path.
- Wall sound: strength checked and anchors bought to suit it and the full-tank weight.
- Electrical ready: dedicated point, ELCB, earthing, and correct cable all confirmed.
- Water isolatable: you know where to shut off the supply and have the isolation valve to hand.
- All parts present: bracket, valves, hoses, tape, laid out and counted.
- Tools ready: drill, bits, level, spanners within reach.
- Power off: MCB switched off before any wiring is touched.
Tick every box and the install itself becomes almost boring, which, honestly, is exactly what you want from a geyser fitting.
A quick lesson from a rushed job
I was once helping a friend fit a 15L geyser on a Sunday, and we were nearly done before I noticed the bathroom point had no earth wire connected at the box, just live and neutral, the earth terminal empty. Everything would have worked. The water would have heated. And a small fault, months later, could have turned that tank into a shock hazard on a wet floor. We stopped, ran a proper earth, and only then energised it. That five-minute check was the most important thing we did all day. It is why the electrical section of this list is the one I never let anyone skip.
Frequently Asked Questions
What should I check before installing a geyser?
Confirm the tank suits your capacity needs and water type, the wall or floor can carry a full tank, and there is a correct dedicated electrical point with a working ELCB and proper earthing. Then lay out all valves, fittings, and tools before you start, and switch off the power at the MCB.
What size geyser do I need for my home?
A couple usually manages on a 10-15L storage geyser, while a family wanting back-to-back baths or a shower is better with 25L or more. Instant geysers of 3-6L suit a single tap for quick washing-up. Match capacity to how many people bathe close together, not just the number of people.
Do I need a separate electrical point for a geyser?
Yes. A geyser should have its own dedicated point, typically 16A, with a suitably rated cable, an MCB or ELCB, and proper earthing. Sharing a socket with other appliances risks overheating and nuisance tripping. If a correct point does not exist, have a licensed electrician install one first.
Which parts must never be left out of a geyser install?
Three items are non-negotiable: the pressure relief valve, which releases dangerous excess pressure; the isolation valve, which lets you shut off water for servicing; and proper earthing. Skipping any of these turns a routine install into a genuine safety risk, so confirm all three are in place before you begin.
How do I know if my bathroom wall can hold a geyser?
Knock on the wall, a dull, solid thud means brick or concrete that holds a tank well with the right anchors, while a hollow ring means block that needs special anchors or a floor stand. Always size the fixing for a full tank: a filled 25L geyser loads the wall with over 30 kg.
The bottom line
A smooth geyser install is really just good preparation wearing overalls. Confirm the tank, the wall, and above all the electrical point with its earthing; gather every valve, fitting, and tool; then switch off the power and begin. Do the checklist honestly and you sidestep almost every common problem. To make sure you dodge the rest, read our rundown of the water heater installation mistakes to avoid, and explore the wider set of installation guides to plan your fit end to end. For the safety and efficiency marks worth checking, the Bureau of Indian Standards is the authoritative reference.
