Repaired where a repair is honest and replaced where it is not, with the paperwork that keeps the manufacturer warranty worth something handed over on the day.
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A hot water system is one of the larger single purchases in a house, and it comes with a manufacturer's warranty that is a real part of what you are paying for. It is also one of the easiest warranties in the world to quietly lose.
The reason is that these warranties generally depend on the unit having been installed by a licensed person, to the requirements. That is entirely reasonable, and it means that if a claim is ever made, the first question is who installed it and whether they were qualified to.
Four years after the fact, that question is answered by paperwork or it is answered by nobody. The tradesperson has moved on, the invoice may be a line in an email, and a warranty that cannot be substantiated is a warranty that does not exist in any way that matters.
So ask for three things before the van leaves, and it is a two minute conversation: the compliance paperwork for the work, the manufacturer's documentation for the unit, and a clear record of the install date. Put them with the property papers. We hand ours over as a matter of course, and you should expect the same from anybody.
See whether you can find the paperwork. If it is not there, that is worth chasing while the installer is still contactable.
Manufacturer warranties generally require installation by a licensed person. That is a condition rather than a formality, and it is the first thing checked when a claim is made.
So the value of the warranty depends on being able to show who installed the unit and that they were licensed to do it.
Which means the paperwork is part of the product you bought, not an administrative afterthought.
The tradesperson has moved on, the business may have changed hands, and the invoice is a line in an old email you cannot find. None of that is unusual.
A warranty claim four years into a ten year period is exactly when this comes up, because that is when tanks start failing.
It is entirely avoidable with five minutes on the day of installation, which is why this page exists.
Compliance paperwork for the installation, the manufacturer documentation with the model and serial recorded, and the install date in writing.
Photograph the compliance plate on the unit while you are there. Make, model, capacity and date of manufacture, all in one image.
Put all four in the same place as the property papers rather than in a folder of receipts. They are worth more together than separately.
Periods vary by brand and by component, and tanks and parts are frequently covered for different lengths of time. Labour is a separate question again.
Read what came with the unit rather than what a website says about the brand, because the document that came in the box is the one that governs.
We will tell you what we think is claimable before doing paid work on a unit that might be covered. It costs us a job occasionally and it is the right way round.
An anode rod sits inside every storage tank and corrodes in place of the steel around it. That is not a defect, it is the design working.
Soft water means corrosion rather than scale is what finishes a cylinder in this city, so the anode is doing the load-bearing work on the life of the unit.
Once it is gone the clock starts. Replacing one is cheap and quick, and around six or seven years is when it becomes the obvious thing to do.
Run the cold, then the hot. Clear cold with rusty or discoloured hot is the single most informative thing a hot water system will ever tell you, and it means the steel is corroding.
Rumbling as it heats is the other one, usually sediment sitting on the bottom of the cylinder.
Together they mean the unit is near the end of its useful life. Replacing on your own schedule is cheaper and far less disruptive than replacing on its.
Houses here have been extended, and a bathroom added at the back can be a long way from a unit installed where the original one went. The water standing in that run has to be pushed out first.
That is pipe length rather than a failing heater, and it is not a warranty matter because nothing has failed.
The exception is a wait that has got noticeably longer than it used to be, because a change has a cause.
A tank in a roof space, an internal cupboard or a tight side passage narrows the options, and on housing of this age that is common. Continuous flow needs an external wall and a flue path. A heat pump needs airflow and clearance.
None of that rules out changing systems. It means working it out before ordering, because the cheapest unit that will not fit where the old one was is not cheap.
Getting the old one out is part of the job too, and on an internal cupboard in a period house that is a real part rather than an afterthought.
A tempering valve limits the temperature delivered to bathroom outlets and it is required. Set too low, or failing, it produces water that is never quite hot enough anywhere.
That gets read as an undersized or faulty system and it is neither. It is a small part with a small price.
It is worth ruling out first on any complaint about temperature, because it is both the likeliest explanation and the cheapest.
Water emerging from the body of the cylinder rather than from a fitting on it. That is the steel, and steel does not get patched.
A leak at a valve or a connection is ordinary work and frequently cheap. Confusing the two costs people a great deal.
Isolate it, cut its power or gas, and book the replacement. Waiting adds flooring and plaster to a bill that was only ever going to be a hot water system.
Five types, and they differ in what the property has to give them as much as in how they perform. This is the comparison worth having while you still have time to have it.
| Type | How it works | Expected span | What the property must provide |
|---|---|---|---|
| Electric storage | A submerged element warms a stored volume | About 8 to 12 years | A position and a circuit |
| Gas storage | A burner beneath keeps the volume hot | About 8 to 12 years | Gas connected, and flue clearances met |
| Continuous flow | Heated in transit, nothing stored | About 15 to 20 years | Gas, and a compliant wall position |
| Heat pump | Ambient warmth moved into the tank | About 10 to 15 years | Outdoor space with genuine airflow |
| Solar with boost | Roof collectors with an element for poor weather | About 15 to 20 years | Roof area with a workable orientation |
A starting point rather than a rule. Storage is judged on how much can be drawn before it empties, so the number that counts is how many people want hot water inside one hour.
| Occupants | Electric storage | Gas storage | 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 |
| Five or more | 315 to 400 L | 170 L or twin | 26 L/min |
| Two bathrooms at once | Size up a step | Size up a step | 26 L/min |
Fixed price agreed before anything starts. These are indicative 2026 ranges.
Taken off the repair in full if you ask us to carry it out.
The most common electric fault, and the reason a cold tank is not automatically a dead one.
Cheap insurance on a cylinder with years left in it.
Unit, install, removal of the old one and the documentation, in one figure.
Subject to gas at the property and a wall that meets the flue clearances.
Hot water fills more of the diary than anything else. Electric storage runs a good deal of the older housing here, gas turns up wherever a property is connected for it, and continuous flow appears where a cylinder had to leave the floor. These are the makes.
We service and replace these systems as an independent licensed plumber. We are not an agent for, or endorsed by, any of these manufacturers.
Type, age and where it sits, which between them settle most of the repair or replace question before anybody drives out.
Every unit carries a compliance plate with a date, and we read it out, because a real age turns repair or replace into arithmetic.
Anode, element or thermostat where that solves it, and a changeover only where the unit is genuinely finished.
Delivered temperature checked, old unit removed, and the paperwork handed over rather than promised.
A licensed plumber answers directly. Repairs are usually same-day and plenty of changeovers are too.
Call 1300 381 569Because the manufacturer's warranty on a new unit generally depends on it having been installed by a licensed person to the requirements. If a warranty claim ever gets made, the first question is who installed it, and the document from the day is the answer. Without it you are relying on somebody's memory.
It varies by manufacturer and by model, and cylinders commonly carry a longer warranty on the tank than on the parts. The point is not the number of years. It is that whatever the number is, it is worth very little if you cannot show how the unit was installed.
The compliance paperwork for the work, the manufacturer's documentation for the unit, and a clear record of the install date. Ask for all three before the van leaves. It is a two minute conversation and it is much harder to have four years later.
Soft water is why they fail this particular way. In hard-water places a tank silts up with scale. Sydney's is not like that, so the sacrificial anode is consumed protecting the steel and the tank starts corroding once it is gone, or an element burns out. Both are frequently repairs.
On a unit you plan to keep, it is the best value job in this trade. It costs a fraction of the tank it protects and it is the only maintenance that genuinely adds years.
Replace. Water from the body of the cylinder means the steel has gone and there is no patch for that. Shut it off and ring, because the damage compounds daily.
Diagnosis is $120 to $250 and comes off the repair. An element or thermostat is $250 to $550. An anode is $300 to $600. A storage replacement is $1,400 to $2,800, and a continuous flow changeover $2,000 to $3,800.
Tell us the type and roughly the age. And if a system went in recently and you are not sure what paperwork you were given, mention that too.
Kept if it can be kept, replaced if it cannot, and documented either way.
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