Repaired or replaced within whatever the building actually permits. The first question is whether the problem is yours at all.
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The single most useful question in a city apartment is whether the neighbours have hot water too.
Some buildings supply it centrally. Where that is the case, a whole-building outage is not something an individual plumber attends; it is a matter for management, and calling one out achieves nothing except an invoice.
If it is only your apartment, it is your unit, and from there the diagnosis is the same as anywhere. Sydney's water is soft, so a storage tank is protected by a sacrificial anode that corrodes so the steel does not, and once it is spent the tank corrodes instead.
What is different is the replacement. Where the unit sits, what fuel reaches it and whether a flue can go on an external wall are all constrained, and the outside of the building is common property. Those are questions for before you order, not after.
Then it may be a central system, and that is management's rather than a plumber's. Worth checking before anybody is called.
Some buildings supply hot water centrally, and a whole-building outage is managed by the building rather than by you. Ringing a plumber for it achieves nothing.
One message asking whether anybody else has hot water settles it before you have spent anything.
If it is only your apartment, the unit is almost certainly yours and the rest of this page applies.
Central plant serving the building, an individual unit inside your apartment, or an individual unit in a shared plant area. All three exist in city buildings and they are handled completely differently.
It is worth finding out now rather than at the point something fails. Building management or the strata records will know.
It also decides whether you can change systems at all, which is the subject of the block below.
Position, fuel and flue placement are all limited in an apartment, and the exterior of the building is generally not yours to alter.
A continuous flow unit needs a flue terminating outside with required clearances from windows and vents, which on a facade is both a technical and a strata question.
So the honest answer is frequently that the practical choice is narrower than the catalogue, and it is better to establish that before ordering anything.
Which in a tower is an argument in its own right, separate from running cost. There is no cylinder of hot water sitting inside your apartment above somebody else's ceiling.
A storage tank in an apartment is a volume of water with a finite life, positioned above other people's homes. That is a real consideration rather than a theoretical one.
Where a flue position can be resolved, it is frequently the better answer in a building for that reason alone.
Where the unit is your own, the sacrificial anode is what protects a storage tank, and it corrodes deliberately so the steel does not.
Sydney supply is soft, so scale is not what ends a cylinder here and descaling advice written elsewhere does not apply.
Renewing an anode is inexpensive against a replacement, and in an apartment the consequence of a tank failing makes that argument stronger than usual.
A unit that empties mid-shower is generally undersized for how the apartment is used rather than broken, particularly where the household has changed.
Capacity is drawn down by what is taken in the same short window, so two people showering back to back is a different demand from the same two spread over an evening.
Worth establishing before assuming a fault, because in an apartment the replacement options are limited enough that you want to be sure.
A shower draws hot and cold together, so the head sets the rate the unit is drawn down at. Anything installed before the WELS labelling scheme can flow well above nine litres a minute.
In an apartment this is an unusually good bet, because changing a head needs nobody's permission and costs very little.
If it solves it you have avoided a strata conversation entirely, which is worth more here than the money saved.
It runs downward through more than one apartment, and the damage outruns the unit's own value within hours rather than days.
Turn the water off at the unit, kill its power, and tell building management immediately, before you have arranged anything else.
The people below you cannot see it happening and will not know until it reaches their ceiling.
Whoever assesses the damage was not in the room, and afterwards the evidence is a dry patch and a description.
Take the unit, the water, the affected surfaces, and something showing the time. It takes half a minute.
In a building that record matters more than in a house, because more than one insurer and more than one party may need to understand what happened.
Removing a cylinder from an apartment involves a lift, a corridor and a building's rules about both, and that is a genuine part of the job rather than an afterthought.
It belongs in the quote and it belongs in the booking, because it may need a lift booked and protection laid.
Mention the floor and the access when you ring. It changes what we send and when we can come.
Type and capacity settle most changeovers. In an apartment two things come first: whether the hot water is even yours to replace, and what the building permits in terms of position and flue. Both are worth settling before anything is ordered.
| Type | Method of heating | Expected span | Reasonable in an apartment where |
|---|---|---|---|
| Electric tank | A submerged element warms stored water | About 8 to 12 years | A tank was designed into the apartment and the recess suits it |
| Gas tank | A burner underneath maintains the stored volume | About 8 to 12 years | Gas reaches the apartment and flue clearances can be met |
| Continuous flow | Heated in transit, with nothing held back | About 15 to 20 years | Gas reaches you and the building permits an external flue |
| Heat pump | Ambient warmth transferred into the tank | About 10 to 15 years | There is genuine outdoor space, which is uncommon here |
| Central building system | Supplied to the whole building | Managed by the building | It is not yours to replace, and an outage is management's |
An opening position rather than a prescription. What counts is how many people want hot water inside one hour.
| Occupants | Electric tank | Gas tank | Continuous flow |
|---|---|---|---|
| One or two | 125 to 160 L | 90 to 135 L | 16 L/min |
| Three to four | 250 to 315 L | 135 to 170 L | 20 L/min |
| Two bathrooms at once | Size up a step | Size up a step | 26 L/min |
| Central supply | Not applicable | Not applicable | Managed by the building |
Fixed price agreed before anything starts, with building access accounted for. These are indicative 2026 ranges.
Credited against the repair if you go ahead.
The most common fault on a storage unit, and a repair rather than a replacement.
The cheapest worthwhile thing you can do for a tank you intend to keep.
Supplied and installed, with removal, disposal and building access included.
Where gas reaches the apartment and the building permits the flue position.
Continuous flow through a great deal of the newer stock, with electric storage where a tank was designed into the apartment. These are the makes behind both.
We service and replace these systems as an independent licensed plumber. We are not an agent for, or endorsed by, any of these manufacturers.
If the whole building is out it may be a central system and management's rather than ours. That saves you a call-out.
Where the unit is yours, we find the compliance plate and tell you the age before anybody mentions replacing it.
If an anode, an element or a thermostat genuinely fixes it, that is the quote you get.
Old unit removed and taken away, the new one installed to standard and warranted in writing.
Check whether the neighbours have it, then ring. That one answer decides whether this is even a job for a plumber.
Call 1300 381 569First establish whether your neighbours have it. Some buildings supply hot water centrally, in which case a whole-building outage is not something an individual plumber attends, it is a matter for management. If it is only your apartment, it is your unit. That one question saves an unnecessary call-out.
Not necessarily. Where the unit sits, what fuel reaches it, and whether a flue can be placed on an external wall are all constrained in an apartment, and the outside of the building is common property. It is worth establishing what is permitted before anything is ordered.
On a storage unit, very often. Sydney's water is soft, so the scale that finishes tanks elsewhere is not the story. The sacrificial anode corrodes away protecting the steel, and once it is spent the tank starts corroding. That or a failed element is most of what we see.
Isolate it, tell building management immediately, and ring. A leaking storage tank is not a repair, and in a tower the water damage runs downward through more than one home. This is the one hot water problem that is genuinely urgent.
Frequently, and for a reason beyond running cost: nothing is stored, so there is no volume sitting above other people's homes waiting to fail. It depends on gas reaching the apartment and a compliant flue position, both of which the building has a say in.
It depends on type, installation and whether the anode was ever looked at, so we will not put a number on a unit we have not seen. We will find the compliance plate, tell you the age, and give a straight view.
Diagnosis and report is $120 to $250, credited against the repair if you proceed. An element or thermostat is $250 to $550. An anode replaced is $300 to $600. A storage replacement is $1,400 to $2,800 installed, with building access accounted for.
Tell us whether the neighbours are affected, where the unit sits, and roughly how old it is. The first of those may end the conversation early, in a good way.
Repair quoted before replacement, building constraints established first, and a written warranty either way.
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