Key Takeaways
- A safe geyser install needs three things done right: a level wall mount that can carry a full tank, correct inlet-outlet plumbing, and proper earthing with a dedicated ELCB-protected circuit.
- Match the heater to your water and family first, size the capacity, then pick the spot before you touch a spanner.
- Electrical work (earthing, the dedicated point, the ELCB) is where I always tell homeowners to call a licensed electrician, even confident DIYers.
- Hard water and skipped flushing kill more tanks than any manufacturing fault I see.
- Gas geysers must never go in a closed bathroom without cross-ventilation, or you risk carbon monoxide.
Most geyser problems I get called out for aren’t faulty units at all. They’re install mistakes: a wobbly bracket, a missing earth wire, a tank fitted the wrong way up, or an inlet-outlet mix-up that leaves the family with lukewarm water all winter. After more than ten years of fitting and servicing storage and instant geysers across flats and independent houses, I can tell you the machine rarely fails first. The installation does. By the end of this guide you’ll understand every stage of a proper water heater installation, what you can safely do yourself, and exactly where to hand over to a professional.
This is the pillar page for our whole installation section, so think of it as the map. Each stage below links to a deeper how-to if you want the fine detail. Read it top to bottom once before you buy anything, and you’ll avoid the expensive re-do that so many first-timers end up paying for.
Before Anything Else: Know Your Water and Your Family
The best install in the world can’t save a wrongly chosen geyser. Two things decide almost everything: your water quality and how many people bathe in the morning rush.
If you’re in a hard-water belt (much of North and West India runs hard), scale is your enemy. A glass-lined or vitreous-enamel tank with a healthy sacrificial anode rod will last years longer than a cheap unlined tank. Soft or treated water is more forgiving, but I still won’t fit a tank without an anode.
For capacity, a rough real-world guide from the homes I’ve done:
| Household / use | Typical storage size | Notes |
|---|---|---|
| 1-2 people, bucket bath | 10-15 L | 15 L is the comfortable everyday size |
| Small family, bucket bath | 15-25 L | 25 L handles back-to-back baths |
| Family with a shower | 25-35 L | Showers drain hot water fast |
| Kitchen / basin only | 1-3 L instant | Instant geyser, no storage |
Get the type and size right and the rest of this guide is just careful, honest labour.
A quick worked example
Let me make this concrete with a family I fitted for recently. Four people, one bathroom, everyone bathing between 6.30 and 8 in the morning, two of them using a shower and two using buckets. The house is on borewell water, which tested hard.
A 15 L unit would have left the last person cold. We went with a 25 L glass-lined tank with a good anode, which comfortably covered back-to-back baths without a long re-heat wait. For the hard water, I stressed the glass lining and told them to plan a descale every year or two. That single sizing decision is the difference between a happy morning and a family fight, and it costs nothing extra to get right at the buying stage.
If your morning rush is staggered, you can often drop a size. If everyone piles in together, size up. When in doubt, I lean one size larger for hard-water homes, because scale slowly eats into a tank’s effective hot-water output over the years.
Choosing the Right Spot on the Wall
Where a geyser goes matters more than people think. I look for a solid load-bearing wall, not a hollow partition or a lightweight false wall. A filled 25 L storage geyser can weigh well over 40 kg, and that dead weight hangs there for years.
Height is the next call. Mount it high enough that the outlet gives good flow to the shower or tap, but low enough that you can actually reach the safety valve and the electrical connection for service. I like leaving at least 300 mm of clearance above the unit so the next person who services it isn’t fighting the ceiling.
- Keep it away from the direct spray of a shower.
- Leave room around it for a spanner and your hands.
- Make sure the power point and earth reach without a joint or extension.
- For a gas geyser, the spot must have real cross-ventilation, never a sealed bathroom.
Warning: Never mount a gas geyser inside a small closed bathroom. Burning LPG or PNG in an unventilated space produces carbon monoxide, which is odourless and can be fatal. It belongs on a ventilated wall with an open window or exhaust, ideally outside the wet area.
Mounting the Geyser Securely
This is the stage a careful DIYer can genuinely handle, and it’s where cutting corners shows up fastest. A geyser that shifts even a little will stress the plumbing joints until they weep.
The bracket that ships in the box is usually fine, but the wall plugs and screws often aren’t rated for the load in a real concrete or brick wall. I upgrade to proper heavy-duty fasteners sized to the wall. If you’re unsure which fixings suit your wall, our guide to the best mounting brackets and wall fixings walks through the options.
- Hold the bracket at your chosen height and check it dead level with a spirit level.
- Mark the holes, then drill into solid masonry, not into a mortar line.
- Fit the correct plugs and drive in heavy-duty screws or anchor bolts.
- Tug the bracket hard. It should not move at all.
- Hang the geyser and confirm it sits level before connecting anything.
A vertical (wall-mounted) unit must go the right way up, with inlet and outlet as the maker intends. Fit it upside down and the internal draw of hot and cold gets confused, and you’ll never get a proper hot supply.
Getting the Plumbing Right
Every storage geyser has a colour-coded pair: blue for cold water in, red for hot water out. Reverse them and you’ll either get no hot water or a trickle. I’ve fixed this exact mix-up more times than I can count.
- Connect the mains cold supply to the blue (inlet) side, with a stop valve so you can isolate the unit for service.
- Connect the hot outlet (red) to the tap or shower line.
- Wrap threaded joints in PTFE (Teflon) tape, snug but not so tight the fitting cracks.
- Fit the pressure relief / safety valve that comes with the unit. It is not optional.
That safety valve is the single most ignored part of an install. It’s there to release pressure if the thermostat ever fails and the tank overheats. On many installs I add a small drain pipe from the valve so any release runs safely away instead of dripping on the floor or the electrics below.
Tip: Once plumbed, fill the tank fully before switching on the power. Open a hot tap and wait until a steady, air-free stream runs. Heating a dry or half-full tank can burn out the element in minutes and voids most warranties.
The Electrical Work: Where I Draw the Line
I’m all for sensible DIY, but I’ll be straight with you: the electrical side of a geyser is where I tell every homeowner to bring in a licensed electrician. Water and mains electricity in a wet room leave no room for a lucky guess.
A dedicated circuit, not a shared one
A storage geyser draws a heavy load (commonly around 2 kW, sometimes more). It needs its own dedicated point on a suitably rated MCB, not a socket shared with a mixer or a hair dryer. Running it off an under-rated wire or a shared line is a classic cause of tripping and, worse, overheated cabling.
Earthing and the ELCB / RCCB
Proper earthing is what stops the metal body of a geyser from becoming live if the element ever leaks current. Paired with an ELCB (or RCCB), it will cut the supply the instant it detects leakage. In a bathroom, that device is the difference between a nuisance trip and a serious shock. Have your electrician confirm the earth is genuinely connected to your building’s earthing, test it, and never rely on a two-pin plug.
Once fitted, the ELCB should be tested with its test button, and I re-check it every service. If you want to understand exactly what a good, careful electrician should be checking before switch-on, our pre-installation checklist lays it out step by step.
Electric vs Gas vs Solar: How the Install Differs
Not every geyser installs the same way. Here’s the honest short version of what each type demands.
| Type | Key install need | Main watch-out |
|---|---|---|
| Electric storage | Dedicated point, earthing, ELCB, safety valve | Wiring load and earthing |
| Instant electric | Same electricals, no bulky tank | Higher wattage on a short burst |
| Gas (LPG/PNG) | Ventilation, correct gas line, flue clearance | Carbon monoxide in closed rooms |
| Solar | Roof frame, tank support, plumbing runs | Structural load and pipe insulation |
If you’re following the electric route in full, our dedicated walkthrough on how to install an electric geyser step by step covers the wiring connection in detail. And if you’re taking out an old unit first, see the guide to replacing an old water heater at home.
Preparing the Site Before Install Day
Half the delays I see on install day come from a site that wasn’t ready. Sort these out beforehand and the actual fitting goes quickly and cleanly.
- Confirm the dedicated power point and earth are already run to the spot, or booked with the electrician for the same day.
- Make sure a mains cold line with a stop valve reaches the inlet position.
- Clear the wall of tiles you can’t drill through, or plan the fixings around them.
- Keep the old unit’s removal, if any, sequenced before the new fit.
- Have the safety valve, connectors and PTFE tape on hand so nobody runs to the shop mid-job.
For solar and gas units there’s extra prep. Solar needs a sound roof frame and insulated pipe runs so you don’t lose heat on the way down. Gas needs a correct gas line and, above all, genuine ventilation. Sorting these before the fitter arrives keeps the job to a single visit and avoids the half-done install that sits unusable for a week.
Testing and First Use
Never treat switch-on as the finish line. This final check is where you catch a slow leak or a wiring fault before it becomes a flood or a shock.
- Confirm the tank is completely full and air-free.
- Check every plumbing joint under mains pressure for even the smallest weep.
- Have the electrician verify earthing and press-test the ELCB.
- Switch on and let it heat one full cycle. The thermostat should cut off on its own.
- Draw hot water from the tap and check the temperature is steady, not scalding.
A geyser that reaches temperature, cuts off cleanly, and holds it without tripping is a good install. If it trips, drips, or the water never gets hot, stop and diagnose before daily use.
Common Installation Mistakes I See
The same handful of errors account for most call-backs. Knowing them upfront saves you money.
- Inlet and outlet reversed, so no hot water reaches the tap.
- A weak bracket or wall plug that lets the unit sag over time.
- No earthing, or a fake earth that isn’t actually connected.
- Skipping the safety valve, or blocking it.
- Powering on before the tank is full.
- A gas geyser in a closed, unventilated bathroom.
For the full breakdown with fixes, read our guide to the most common water heater installation mistakes. Almost every one is avoidable with a slow, checklist-driven approach.
Frequently Asked Questions
Can I install a geyser myself?
You can safely handle the mounting and much of the plumbing if you’re careful. But the electrical work, earthing, the dedicated point, and the ELCB, should be done by a licensed electrician. Water and mains power in a bathroom are not worth the risk of a guess.
What size geyser do I need for my family?
For bucket baths, 15 L suits one or two people and 25 L suits a small family. If you use a shower, step up to 25-35 L because showers drain hot water quickly. For a kitchen sink alone, a 1-3 L instant geyser is enough. Water quality also affects your choice.
Why is my new geyser not giving hot water?
The most common reason on a fresh install is reversed inlet and outlet connections, cold going into the hot side. Check the blue inlet and red outlet are correct. Other causes are an unfilled tank at switch-on or the thermostat set too low. Fix the plumbing first.
Does a geyser need special wiring?
Yes. A storage geyser needs a dedicated circuit on a correctly rated MCB, proper earthing, and ELCB protection, not a shared socket. The cable must be rated for the load. This is standard practice and should be set up by a qualified electrician for safety.
How high should a geyser be mounted?
Mount it high enough for good outlet flow but low enough that the safety valve and electrical connection stay within reach for servicing. Leave at least 300 mm of clearance above it, and always fix it to a solid load-bearing wall that can carry the full weight of a filled tank.
Putting It All Together
A good geyser install isn’t complicated, but it is unforgiving of shortcuts. Choose the right type for your water and family, mount it rock-solid on a load-bearing wall, get the inlet-outlet plumbing and safety valve right, and hand the electrical work to a licensed professional. Do those in order and your heater will quietly do its job for years, with only routine servicing to think about.
If you’d like to go deeper on any single stage, browse the full installation guides, or start with the basics of how a geyser actually works so the choices above make even more sense. And if in doubt, there’s no shame in calling a good plumber and electrician. It’s cheaper than a re-do. You can read more about water heating fundamentals on Wikipedia’s water heating page and check appliance energy ratings at the Bureau of Energy Efficiency.
