There is one question worth asking before you ring anybody about hot water in a city apartment, and it takes about a minute. Do your neighbours have hot water?
It matters because some buildings here supply hot water centrally rather than from a unit inside each apartment. Where that is the case, a whole-building outage is not something an individual plumber can attend to. It is a matter for building management, and calling somebody out achieves nothing except an invoice.
If your neighbours have no hot water either, the building's supply is the issue and that is management's to deal with, not an individual plumber's. If it is only your apartment, it is your unit and the diagnosis is the same as anywhere: an element, a thermostat, a valve or a spent anode. One question separates the two.
- Ask a neighbour whether they have hot water
- Check whether anything has been posted about building works or an outage
- If the whole building is out, tell management rather than ringing a plumber
- If it is only you, it is your unit and it is very often a repair
- Find out now whether your building supplies hot water centrally
On this page
1. The one question that comes first
Do the neighbours have hot water. That is it, and it costs a knock on a door or a message in a building group.
A whole-building outage and a failure in your own unit produce exactly the same symptom at your tap. From inside the apartment there is no way to tell them apart, and they have completely different answers.
The reason it matters financially is that a plumber attending a central-system outage can do nothing about it. The plant is not in your apartment, the access is controlled, and the responsibility is not the individual resident's. That is a call-out for nothing, and it is entirely avoidable.
Plenty of residents have lived somewhere for years without knowing whether the hot water comes from a unit in the apartment or from the building. Worth establishing while nothing is wrong.
2. Find out which kind of building you are in, today
- Look for a hot water unit in the apartment: in a cupboard, a laundry, on a balcony or external wall.
- If you cannot find one, that is informative. It may be central, or it may be somewhere you do not have access to.
- Ask management directly. It is a reasonable question and they will know.
- Ask a neighbour who has lived there longer.
- Check whether there is anything in your building documentation about it.
- Write the answer down with whatever else you keep about the apartment.
Five minutes on an ordinary afternoon, and it removes an entire category of wasted call-out from your life.
3. If it is only your apartment
Then it is your unit, and from there the diagnosis is the same as anywhere in Sydney.
On a storage system, the common failures are an element, a thermostat, a valve or a spent sacrificial anode. Sydney's water is soft, so the limescale that finishes tanks in hard-water places is not the story here. A good proportion of these are repairs rather than replacements.
- Electric storage: check whether a circuit has tripped at the switchboard.
- Gas: check the pilot or ignition and whether the supply is on.
- Either: find out whether somebody working elsewhere has closed an isolation valve, which happens more in a building than in a house.
- If none of that explains it, leave it and ring.
Worth reading the compliance plate on the unit while you are there. Its actual age is the single fact that decides whether a fault is worth repairing, and you should not have to take anybody's word for it.
4. What you can actually replace, if it comes to that
Where the unit is yours and it has genuinely failed, replacement is constrained in a city apartment in ways it is not in a house.
Where the unit sits, what fuel reaches it, and whether a flue can be positioned on an external wall are all limited, and the outside of the building is common property. Those are questions for before anything is ordered, not after it is delivered.
Continuous flow suits a lot of these apartments for a reason beyond running cost: it stores nothing, so there is no volume of water sitting above other people's homes waiting to fail. Whether it is available depends on gas reaching the apartment and on a compliant flue position, both of which the building has a say in.
Unit is yours and it has failed?
We will diagnose it and establish what the building will actually permit before anything is ordered.
5. The one hot water problem that is genuinely urgent
A leaking storage tank, in an apartment, above other homes.
That is not a repair and it is not something to watch for a week. A tank holds a substantial volume of water, and in a building the damage runs downward through more than one household. The cost of waiting exceeds the cost of dealing with it very quickly.
Isolate it if you can, tell building management immediately, and ring. Management matters here as much as the plumber, because they can warn the apartments below and act on the building in ways a resident cannot.
6. Worth knowing before you need it
- Whether your building supplies hot water centrally or from a unit in each apartment.
- Where your unit is, if you have one, and where its isolation is.
- The age of the unit from its compliance plate.
- Where your water isolation valve is, and whether it turns.
- Who to contact in the building, and how, out of hours.
- Whether the building has restrictions on when work can happen.
Six answers, and they turn every future hot water problem from a puzzle into a phone call. It is the least dramatic advice on this site and among the most useful.
- Ask whether the neighbours have hot water before ringing anybody. It is the first question.
- Some city buildings supply hot water centrally, and a whole-building outage is management's.
- If it is only your apartment, it is your unit and it is very often a repair.
- Soft water means an anode or an element, not scale. Read the compliance plate for the age.
- What you can install is constrained by position, fuel and flue, and the exterior is common property.
- A leaking tank above other homes is the one genuinely urgent hot water problem.
Is the hot water yours? FAQs
How do I know if my building has central hot water?
Look for a unit in the apartment first. If there is not one, ask management directly, because it is a reasonable question and they will know. Worth establishing while nothing is wrong rather than at seven on a Sunday morning.
The whole building has no hot water. Should I ring a plumber?
Tell building management. If the supply is central, an individual plumber cannot do anything about it, because the plant is not in your apartment and the access is controlled. That call-out achieves nothing.
It is only my apartment. What is usually wrong?
On a storage unit, an element, a thermostat, a valve or a spent anode. Sydney's water is soft so scale is not the story. Check for a tripped circuit or a closed isolation valve first, because both are free to rule out.
Can I replace my unit with whatever I want?
Not necessarily. Position, available fuel and flue placement are all constrained in an apartment, and the outside of the building is common property. Establish what is permitted before anything is ordered.
Is continuous flow better in an apartment?
Frequently, and partly for a reason that has nothing to do with running cost: it stores nothing, so there is no volume sitting above other homes. It depends on gas reaching you and a compliant flue position.
My unit is leaking. How urgent is that?
Very. In a building the water runs downward through more than one home, and the damage outruns the cost of the unit quickly. Isolate it, tell management, and ring.