Water Heater Maintenance Dubai
A water heater has one maintenance job and almost nobody does it. The tank needs emptying and flushing once a year, because the mineral that comes out of Dubai water every time it heats has nowhere else to go.
A service is draining the tank, clearing the scale off the floor of it and off the element, checking the rod that protects the lining, and testing the three parts that keep the heater safe.
It is a short visit and it is the difference between a heater reaching the life on the box and reaching half of it. If yours has already stopped working, start with repair instead.
What the service covers
The same list every visit, so you can tell whether it was done. Ask for it from anybody who services a heater, because a service that is a look and a nod is not a service.
- Power isolated at the board and the supply proved dead
- Tank drained down and the sediment flushed out of the base
- Element removed, descaled and inspected for cracking
- Anode rod checked and reported on, replaced if it is gone
- Thermostat tested against its setting rather than assumed
- Thermal cutout checked, and the reason for any past trip looked for
- Pressure relief valve operated and its discharge pipe checked
- Isolation valve operated, so it still turns when it is needed
- Flexible connectors checked for bulging and surface cracking
- Electrical terminals tightened and inspected for heat damage
- Brackets and fixings checked against the weight of a full tank
- Tank refilled, air bled and the temperature proved at a tap
Why a yearly flush is not optional here
Dubai water carries a high mineral load. Heating it drives some of that mineral out of solution, and it settles in two places. On the floor of the tank, and on the element.
The layer on the element is the one that does the damage. It insulates the element from the water, so the heat stays in the element instead of leaving it. The element runs hotter than it was built to run, draws more electricity to heat the same tank, and eventually splits.
The layer on the tank floor does something quieter. It takes up space the water should be in, so a tank that held enough hot water for two showers gradually holds enough for one and a half. People put that down to the heater getting old. It is sediment.
Flushing removes both. Done yearly it is a short job, and the heater behaves like a new one. Left for five years it becomes a dead element, a tank at two thirds capacity, and often a corroded flange that will not take a new element cleanly.
How a service visit runs
- 1
Isolate and prove dead
Off at the breaker, not the wall switch, and tested before anything is opened. A heater element sits in water and this is not a step to take on trust.
- 2
Drain and flush
Cold feed closed, tank emptied to the drain point and flushed until it runs clear. The sediment that comes out is the measure of how overdue it was.
- 3
Element out, scale off
The element is removed, descaled and inspected. A crack in the sheath is the fault that trips breakers, and it is visible once the scale is off.
- 4
Test, refill and report
Thermostat, cutout and pressure valve all tested, the tank refilled and proved hot at a tap. You get told what we found, including what to watch.
If the anode rod has gone or the element is cracked, we say so on the visit and quote it rather than fitting parts nobody agreed to. That crosses over into water heater repair.
What we find most often
Four things turn up on nearly every first service. None of them is a surprise and all of them are cheaper to find now.
An anode rod that is gone
The rod corrodes so the tank does not, and once it has dissolved the tank is unprotected. Nobody checks it, which is why it is the single biggest factor in how long a heater lasts.
Replace it and the tank keeps its protection
A pressure valve that is scaled
Either it drips constantly or it has stopped moving altogether. A valve that cannot open is a safety device that is not a safety device, and it is a cheap part.
Tested and replaced if it does not operate
A thermostat set far too hot
Often from the factory. Water hotter than it needs to be scales faster, costs more to keep hot and is a scald risk with children in the flat.
Set to something sensible and proved
Terminals loose from heat cycling
A heater heats and cools every day, and metal moves each time. Connections work loose, warm up, and discolour. Tightening them is thirty seconds and prevents a real fault.
Checked and tightened every visit
Putting it on a schedule rather than remembering it
The problem with annual maintenance is not the cost. It is that a job you have to remember once a year is a job that gets done twice and then forgotten.
An annual maintenance contract covers the heater alongside the air conditioning, the plumbing and the electrics on one schedule, so the flush happens whether anybody thought about it or not. For a landlord with several units it is the only version of this that actually gets done.
If a contract is more than you need, we are happy to simply note the date and get in touch when it comes round. Either way the useful thing is that it leaves your head. There is more on what preventive work actually saves in this article.
The rest of what goes on the same schedule
A heater flush on its own is a small visit, and most people have it done alongside something else. The obvious pairing is air conditioning, which needs looking at far more often than a heater does, and the plumbing and electrical checks that cover the same cupboard. We also do handyman work, painting, carpentry, tiling, renovation, gypsum partitions and false ceilings, and the full list of services is in one place. If the heater turns out to be past servicing, replacement is the other conversation.
Where we service
Across Dubai, and gladly in several flats in the same building on one visit. If your community is not listed, ask us.
New Dubai
- Dubai Marina
- Jumeirah Lakes Towers
- Palm Jumeirah
- Jumeirah Beach Residence
- Emirates Hills
- The Greens and The Views
- Discovery Gardens
- Dubai Media City
Central Dubai
- Downtown Dubai
- Business Bay
- DIFC
- Al Barsha
- Jumeirah
- Umm Suqeim
- Al Quoz
- Trade Centre
Old Dubai
- Deira
- Bur Dubai
- Al Karama
- Al Nahda
- Mirdif
- Al Qusais
- Oud Metha
- Garhoud
Outer communities
- Arabian Ranches
- Jumeirah Village Circle
- Dubai Silicon Oasis
- Dubai Sports City
- Damac Hills
- Motor City
- Dubai Hills Estate
- International City
Maintenance questions we get asked
How often should a water heater be serviced in Dubai?
Once a year. That is shorter than the interval most manufacturers print, and the reason is the water rather than the heater. A high mineral load means scale builds continuously, so the job that keeps a heater healthy is an annual flush rather than a look every few years.
What is the point of flushing the tank?
Two things come off. The sediment on the floor of the tank, which has been quietly taking up the space your hot water should occupy, and the scale on the element, which stops the element passing its heat into the water. The second is the one that kills heaters, because an insulated element cooks itself.
Is water heater maintenance worth it if nothing is wrong?
That is exactly when it is worth it. Everything on the service list is cheap while the heater still works and expensive once it does not. An anode rod is a small part, a corroded tank is a new heater, and the rod is what decides which of those you end up with.
How long does a service take?
The visit is short. Draining the tank is the slow part and in a flat with low pressure it takes a while on its own, so expect the tank to be out of use for a stretch rather than minutes. A heater above a bathroom ceiling adds time at both ends for access.
Will you tell me if something needs replacing?
Yes, on the visit, with the reason. If the anode rod has dissolved or the element is cracked we quote it rather than fitting it and putting it on the invoice. Nothing gets changed that you did not agree to, including when the honest answer is that the heater is past the point of servicing.
Can you service solar water heaters as well?
Yes, and they need it more. A solar system has collectors on a roof that lose output as dust settles on them, plus a tank and a backup element that scale up the same way any other tank does. That is covered properly on our solar water heater cleaning page.
Book a water heater service
Tell us roughly how old the heater is and whether it has ever been flushed. If the answer is never, that is the visit worth booking first.