Repaired where a repair is honest, replaced where it is not, and quoted complete, including the parts a cheaper quote leaves out.
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Two quotes for the same tank can differ by several hundred dollars, and the difference is almost never the unit. It is what each one includes.
A replacement brings the installation up to the requirements that apply now. In a home, that includes hot water reaching bathroom fixtures used for personal hygiene at no more than 50 degrees. A tempering valve does that: it blends hot with cold on the way out, so the cylinder can be stored hot while the shower is delivered warm.
In older housing there frequently is not a serviceable one, because the original installation predates the requirement. Fitting it is part of doing the job properly, and a quote that leaves it off is not cheaper, it is incomplete.
It is worth knowing about even when you are not replacing anything, because tempering valves wear. When one drifts, the symptom is a shower temperature that wanders for no obvious reason, and that is a repair rather than a new system.
That is frequently a tempering valve rather than the tank. It is a repair, and worth checking before anybody sells you a new system.
The cylinder is kept hot for good reason, because storing water below a certain temperature is not safe. The bathroom is limited to 50 degrees at the outlet.
Those two requirements pull in opposite directions, and a tempering valve is what reconciles them. It mixes stored hot water down to a delivered temperature.
So a bathroom that is warm rather than hot is the system working as intended rather than a unit that has weakened.
The original work predates the requirement, so there was never anything to maintain and nobody has ever thought about it.
Which means a great many houses here have delivered bathroom water at storage temperature for decades, and replacing the system brings the installation up to current requirements.
That is the change people meet and are surprised by. Nothing has gone wrong. The rules changed and the changeover applied them.
Temperature drifting for no reason is frequently the valve rather than the tank. A tempering valve is a mechanical device with a thermostatic element and it wears.
It fails by drifting rather than stopping, so the shower gets erratic instead of cold, and the complaint gets attributed to the hot water system.
It is a small part with a small price, and it is worth ruling out before anybody quotes a new unit.
Bathroom outlets limited to 50 degrees, the kitchen and laundry generally not, and a valve somewhere near the unit that is now part of the installation.
If the bathroom feels different from what you had, that is why, and it is not a fault to be corrected. It is a requirement being met.
We will say so before the work rather than after, because it is the single most common surprise on a hot water replacement in older housing.
It is a serviceable item with a recommended maintenance interval rather than a fit and forget component, and almost nobody knows it is there.
So the useful habit is to have it looked at when anything else is being done to the hot water rather than to book a visit for it.
A valve that has never been touched in fifteen years is the usual explanation for a shower that has become unpredictable.
It means the descaling and flushing routines written for hard-water places are largely irrelevant to a tank here, and following them will not extend its life.
The relevant component is the sacrificial anode, which corrodes deliberately to protect the steel and eventually runs out.
Getting it renewed is inexpensive against a replacement, and it is worth adding to any visit that is already happening rather than booking on its own.
Colour in the hot water when the cold is clear points squarely at the inside of the tank. Nothing else produces that combination.
Noise while it heats, a rumble or a crackle, generally means accumulated sediment with water trapped beneath it.
Neither is an emergency. Both are a tank telling you where it is up to, and acting on that is considerably cheaper than an unplanned replacement on a Sunday.
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. Insulating the pipe helps at the margins, and recirculation genuinely solves it.
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 all three are common.
Continuous flow needs an external wall and a flue path with the required clearances. A heat pump needs airflow, clearance and somewhere its noise is acceptable.
Getting the old one out is part of the job too, and in an internal cupboard in a Federation house that is a real part rather than an afterthought.
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.
Once the compliance work is accounted for, the choice comes down to how each type behaves and what the property can support. This is the comparison worth having.
| Type | How it works | Expected span | Worth considering when |
|---|---|---|---|
| Electric storage | A submerged element warms a stored volume | About 8 to 12 years | There is no gas and the existing position already suits a tank |
| Gas storage | A burner beneath keeps the volume hot | About 8 to 12 years | Gas is connected and the flue clearances can be met |
| Continuous flow | Water is heated in transit and nothing is stored | About 15 to 20 years | Gas is available and floor space is short |
| Heat pump | Ambient warmth is moved into the tank | About 10 to 15 years | Running cost matters and there is outdoor airflow |
| Solar with boost | Roof collectors, with an element for poor weather | About 15 to 20 years | The roof orientation suits it and you are staying put |
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 in 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.
The usual answer to a shower temperature that has started wandering.
Unit, install, removal of the old one, and compliance work, in one figure.
Subject to gas at the property and a wall that meets the flue clearances.
Electric storage right through the older housing here, gas wherever a property is connected for it, and continuous flow anywhere a cylinder had to give up its floor space. These are the makes behind it.
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 whether the shower temperature has been steady. That last one points at a valve rather than a tank.
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, thermostat or tempering valve where that genuinely solves it. Nothing gets changed over while it has life left.
We run it, check the delivered temperature at the bathroom, take the old unit away and leave the paperwork.
A licensed plumber answers directly. Repairs are usually same-day and plenty of changeovers are too.
Call 1300 381 569Frequently it is one item. A replacement has to comply with the current requirements, and in a residence that includes hot water delivered to bathroom fixtures used for personal hygiene at no more than 50 degrees. That is done with a tempering valve. If an older installation does not have a serviceable one, fitting it is part of the job, and a quote that omits it is cheaper because it is incomplete.
It blends hot water with cold before it reaches the bathroom so the delivered temperature is limited, while the tank itself stays hot enough to be safe from a bacterial point of view. It is the reason a storage system can be stored hot and delivered warm.
Yes, it is a mechanical part with a finite life. When one drifts, the symptom is delivered temperature moving around: showers that get hotter or cooler than they used to for no obvious reason. It is a repair rather than a reason to replace the system.
Soft water is why they fail this particular way. In hard-water places a tank silts up with scale. Sydney's supply is not like that, so the sacrificial anode is consumed protecting the steel and the tank starts corroding once it has 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. A weeping cylinder means the steel has gone and there is no patch for that. Shut it off and ring, because the water 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 tempering valve is $250 to $450. A storage replacement is $1,400 to $2,800 and a continuous flow changeover $2,000 to $3,800.
Tell us the type, roughly the age, and whether the shower temperature has been steady. Those three answers separate a valve from a tank before anybody drives out.
Kept if it can be kept, changed if it cannot, and quoted complete either way.
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