Repaired where a repair is honest and replaced where it is not, and sized against what the fixtures actually draw rather than what they drew in 1985.
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Running out of hot water is one of the two most common complaints we take, and the instinct is always the same: the tank is too small, buy a bigger one.
Sometimes that is right. Frequently the tank is fine and the problem is the rate at which it is being emptied. A shower draws hot and cold together, so the flow rate of the head sets how fast the stored volume disappears. A three star head flows no more than nine litres a minute. Plenty of older heads flow well above that, and in an original house here the head is probably as old as the bathroom.
Change it and the same tank lasts noticeably longer, because it is being drawn down more slowly. It costs a fraction of a new system, it takes minutes, and it is worth trying before anybody quotes you a cylinder.
It matters for sizing too. If we size a replacement against the flow rates the house has now, and you change the fixtures next year, you have bought a bigger system than you needed. That is a conversation worth having in one go rather than in two.
Ask what the showerhead flows before anybody quotes a bigger tank. It is the cheaper half of the equation and nobody checks it.
A shower draws hot and cold together, so the showerhead sets the rate at which a cylinder is drawn down. Two heads at nine litres a minute and two at fifteen are completely different demands on the same tank.
Which is why running out of hot water is frequently a fixtures problem rather than a system problem. The tank has not shrunk. The draw on it has grown.
This is the cheapest thing on the page to test and the one almost nobody tries before getting a quote for a bigger unit.
That is the maximum flow for a three star WELS showerhead. Older heads, and anything installed before the labelling scheme, can flow well above it and some are close to double.
A house built or fitted out before those ratings existed was sized against the fixtures of its day. If the fixtures have never changed, the sizing is still working against the old numbers.
You can measure it yourself in a minute with a bucket and a timer, and the answer either explains the problem or rules it out.
A pair of showerheads costs a fraction of a hot water system and takes minutes to fit. If it solves the problem, you have saved several thousand dollars.
If it does not, you have lost very little and you now know the issue is genuinely the system rather than the draw on it. Either result is worth having before you commit.
We would rather tell you this than sell you a unit you do not need. It is also why we ask about the showers before we ask about the tank.
Capacity is decided by how many people shower in the same window rather than by the number of bedrooms. Four people over two hours and four people over forty minutes need different systems.
Family houses on blocks this size frequently change on that measure without anything about the building changing at all. Teenagers are the usual reason.
So it is worth describing your actual mornings when you ask for advice, because that is the number the sizing is done from.
Sydney water is soft. Cylinders here do not silt up the way they do in hard-water regions, so hard-water advice found online does not apply to a tank in this suburb.
What ends a cylinder here is corrosion, and the sacrificial anode exists to corrode instead of the steel. Once it has gone, the tank starts spending itself.
Renewing one costs a fraction of a replacement and buys years. Around the six or seven year mark it is the best value item on this page.
Large blocks and houses that have been extended mean long pipe runs, and the water standing in a long run has to be pushed out before hot arrives. That is geometry, not a broken heater.
No work on the unit changes it. The honest answers are a recirculation line or a small dedicated unit at that end, and both are options rather than repairs.
The exception is a wait that has got noticeably longer than it used to be. A change is a symptom worth looking at.
From a fitting, a valve or a connection on top: that is a repair, frequently a small one, and worth doing.
From the body of the tank itself: the cylinder has corroded through and there is no version of this that gets fixed.
In the second case, isolate it, kill the power or gas, and arrange the replacement before the floor and the wall behind it become part of the cost.
A shower that has always been weak and a shower that has got weak are different problems. The first is usually the head or the pressure at the property. The second is a change, and a change has a cause.
Pressure limiting valves are set to hold the domestic ceiling of 500 kPa and they wear out at around eight to twelve years. A failing one usually fails open, which raises pressure rather than lowering it.
It is worth measuring rather than guessing, because it decides whether the answer is a showerhead, a valve, or the hot water system itself. A gauge and two minutes settles it.
Where the fixtures are not the answer, the choice is between five types and what each one asks of the property.
| Type | How it heats | 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 a boost for poor weather | About 15 to 20 years | Roof area with a workable orientation |
Count the people wanting hot water inside the same hour, and settle the fixtures before the size. Sizing against old flow rates buys a bigger system than the house needs.
| 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.
Comes straight off the repair bill if you tell us to go ahead.
The cheapest thing worth trying when a healthy tank keeps running out.
Two parts account for the overwhelming majority of electric failures.
Buys years on a cylinder that is otherwise sound.
One number covering the appliance, fitting it, and removing the old one.
Nothing comes close to hot water for callout volume. Around here that means a lot of electric storage, gas on properties connected for it, and continuous flow anywhere a cylinder had to give up its floor space. These are the makes we work on.
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 and age of the unit, and whether the bathroom has been redone since the house was built. That second answer is the one nobody expects.
Every unit carries a compliance plate with a date, and we read it out, because a real age turns repair or replace into arithmetic.
Sometimes a showerhead. Sometimes an anode or an element. A changeover only where the unit is genuinely finished.
We run it, check the delivered temperature, take the old unit away and leave you the paperwork.
A licensed plumber answers directly. Repairs are usually same-day and plenty of changeovers are too.
Call 1300 381 569More than people expect. A shower draws hot and cold together, so the flow rate of the head sets how fast hot water leaves the tank. A three star head flows no more than nine litres a minute. Older heads can flow well above that. Change the head and the same tank lasts noticeably longer, because it is being emptied more slowly.
Sometimes, and it is worth trying before replacing a system. It is a fraction of the cost, it takes minutes, and if the complaint is that a healthy tank empties too quickly, the rate it is being drawn at is half of that equation.
It does, and it is the reason we ask. Sizing done against old flow rates gives you a bigger system than you need if the fixtures are about to be changed. It is better to have that conversation in one go than to size for the house as it is and change the fixtures next year.
Less hot water drawn is less hot water heated, so yes in principle. We are not going to put a figure on your household because it depends entirely on how much you shower and any number we invented would be dishonest.
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.
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. A showerhead replaced is $120 to $250. An element or thermostat is $250 to $550. An anode is $300 to $600. A storage replacement is $1,400 to $2,800.
Tell us the type, roughly the age, and whether the bathroom has been touched since the house was built. Those three answers shape the whole conversation.
Kept if it can be kept, replaced if it cannot, and sized once rather than twice.
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