Gas, electric, heat pump and solar. On a block this narrow the deciding factor is rarely the brand, it is whether there is a compliant position with the neighbour's wall a metre away.
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Sydney runs soft water, so what ends a unit here is almost always a spent sacrificial anode or a failed element rather than scale. That much is the same everywhere.
What is different on an inner-west block is where a replacement is allowed to go. A flued appliance has to keep a defined distance from windows, doors and vents, and those rules are about openings rather than ownership.
So when the neighbouring wall is a metre from yours with a bedroom window in it, that window is part of the calculation. It is the most common reason a unit cannot go where the owner assumed, and it is not something you can see from a catalogue.
Then there is simply getting it there. Side passages here are narrow, the old tank has to come out and the new one go in the same way, and both belong in the quoted price rather than in a conversation on the day.
Mention it when you ring. It is genuinely the first thing that decides what can be installed.
A flue terminal must sit a defined distance from windows, doors and vents, and on an inner-west terrace block the nearest window is frequently the neighbour's.
So the constraint is not where your land ends. It is where somebody else's openings are, and those are not yours to move.
That is the first thing to establish before choosing a continuous flow unit here, and it is answered by looking rather than by assuming.
A storage tank is bulky and it travels both ways: the old one out and the new one in. On a terrace with a metre of side passage, that is a real constraint.
It belongs in the quote rather than in a conversation on the day, and a quote that has not looked at the access has not priced the job.
Mention it when you ring, because it changes who and what we send.
It mounts on a wall, is a fraction of the size of a tank, and opens up positions that a cylinder simply cannot occupy.
On housing where getting a tank through the house is the hardest part of the job, that is not a marginal advantage.
The trade is the flue clearance question above, which is why the two blocks belong together.
Replacing in the existing position means no new penetration, no new flue route to negotiate, and no clearance calculation against a neighbour's window.
It is frequently the cheapest and always the least complicated, and it is worth pricing even where you would prefer something different.
Where the existing position genuinely does not work any more, we will say so and explain why.
Sydney's supply is soft, so furring up is rarely what ends a unit. The anode is what protects the tank, corroding in place of the steel until it runs out.
Maintenance advice written for hard-water regions does not describe a cylinder in this suburb at all.
Renewing an anode is inexpensive against a replacement and buys years, and it is worth adding to a visit that is already happening.
The compliance plate carries the date. A young system with a failed component is a repair. An old one with the same fault is usually a replacement.
Photograph the plate and send it through before anybody drives anywhere. In this part of Sydney a second trip has parking attached to it.
Past a certain age the parts are no longer manufactured, and that is better heard on the phone.
There are usually two months of notice. Hot water arriving discoloured while the cold runs clear is the tank reporting corrosion from inside.
Noise on heating, a rumble or crackle, points at sediment on the base of the cylinder.
Neither requires you to do anything today. Both are a reason to get it looked at before the weather turns rather than after the tank has gone.
A tank that empties mid-shower is generally undersized for how the household now behaves rather than faulty. Capacity is drawn down by what is taken in the same short window.
In a terrace where the existing tank is already the largest that will fit, that pushes the conversation towards continuous flow rather than a bigger cylinder.
Describe your actual mornings when you ask for advice, because that is what the sizing runs on.
A shower draws hot and cold together, so the head sets the rate a cylinder is drawn down at. Anything installed before the WELS labelling scheme can flow well above nine litres a minute.
Where the alternative is a difficult changeover down a narrow side passage, this is an unusually good thing to try first.
It costs very little and takes minutes, and if it works you have avoided the whole problem.
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.
Type and size decide most changeovers. On a narrow block there is a prior question worth settling first: whether a compliant position exists at all, given where the nearest openings are. Worth knowing before anything is ordered.
| System | How it heats | Typical life | On a narrow block |
|---|---|---|---|
| Electric storage | An element heats a tank, often overnight on a controlled load tariff | 8 to 12 years | No flue, so clearances are easier. Needs floor space and passage access |
| Gas storage | A burner under a tank keeps a stored volume hot | 8 to 12 years | Needs flue clearances plus floor space, the hardest combination here |
| Continuous flow | Gas heats water on demand, nothing is stored | 15 to 20 years | Wall mounted and compact, so it usually has the most viable positions |
| Heat pump | Moves heat from the air into the tank rather than making it | 10 to 15 years | Needs airflow, and the compressor should not sit against a shared wall |
| Solar with boost | Roof collectors, with an element or burner covering the gap | 15 to 20 years | Roof orientation and structure decide it, and terraces limit both |
A starting point rather than a rule. Storage size is about how much you can draw before it runs out, so what counts is how many people want hot water inside the same hour rather than how many live in the house.
| People in the house | Electric storage | Gas storage | Continuous flow |
|---|---|---|---|
| 1 to 2 | 125 to 160 L | 90 to 135 L | 16 L/min |
| 3 to 4 | 250 to 315 L | 135 to 170 L | 20 L/min |
| 5 or more | 315 to 400 L | 170 L or twin | 26 L/min |
| No floor space at all | Not viable | Not viable | Wall mounted, the usual answer |
Fixed price agreed before we start. These are indicative 2026 ranges. A clearance and access check is included in any replacement quote.
Element, thermostat, valve or anode. Often the whole job on a newer unit.
Like for like in the existing position, old unit carried out and taken away.
Wall mounted, and it opens up positions a tank cannot use.
Before rebate. Needs airflow and a spot where the compressor is not on a shared wall.
Measured off every nearby opening, including the ones that are not yours.
These are the makes we repair and install. On a constrained block we work out where a unit can legally sit before recommending which one, because that decides more than the spec sheet.
We service and replace these systems as an independent licensed plumber. We are not an agent for, or endorsed by, any of these manufacturers.
Three questions that decide most of it, including whether a replacement can go back where the old one was.
Anode, element, thermostat and valve, because a repair also avoids the entire clearance question.
Off every nearby opening, and down the passage the unit has to travel, before a figure is given.
Run up to temperature, checked for leaks, and the old unit taken away rather than left in the passage.
Have the age of the unit ready when you ring, and a rough idea of how close the neighbouring wall is. Those two answers shape the whole job.
Call 1300 381 569Age decides it more than the fault does. Under about eight years a failure is usually a part: an element, a thermostat or the sacrificial anode. Past twelve you are spending on a tank whose lining is near the end regardless of what went wrong today. In between it depends on what has failed and what the tank looks like inside. On a narrow block there is an extra reason to prefer repair where it is genuine, because replacing like for like in the existing position sidesteps the whole clearance question.
Because they are measured from openings, and on an inner-west block a fair number of the nearest openings are not yours. A flue terminal has to sit a defined distance from windows, doors and vents, and the rules do not stop at a boundary line. When the neighbouring wall is a metre away with a bedroom window in it, that window is part of the calculation. It is the single most common reason a hot water unit cannot simply go where the owner assumed it would.
Sometimes, and it is worth checking rather than assuming, because side passages here are narrow and usually have a neighbouring wall on one side. Beyond the clearance question there is access: whatever goes in has to physically get down that passage, and the old one has to come out the same way. We look at both before quoting, so the price you approve is the price for a job that can actually be done.
There usually is, but it may not be where you expected, and a continuous flow unit changes the arithmetic considerably. It is a fraction of the size of a tank, it mounts on a wall, and it opens up positions a storage unit could never use. Where gas is available that is frequently the answer on a constrained block, quite apart from the running cost.
Not through scale, which surprises people from harder water areas. Sydney runs soft, so limescale is rarely what ends a unit here. What fails is the sacrificial anode, a rod designed to corrode instead of the tank, and once it is used up the tank starts corroding. Replacing it on schedule is cheap and adds years, and almost nobody has it done.
It costs nothing and it occasionally saves a great deal. Where a flue terminal will sit near a shared boundary, a neighbour who was told beforehand is a very different proposition from one who discovers it afterwards. We are not asking you to seek permission for compliant work, only pointing out that on blocks this close together, goodwill is worth more than most people expect.
Diagnosing and repairing an element, thermostat, valve or anode is $250 to $650. Replacing electric storage in the same position is $1,400 to $2,800. Continuous flow is $1,900 to $3,500 installed. A heat pump starts around $3,200 before rebate. A clearance and access check is included in any replacement quote, because on these blocks it decides whether the job is possible at all.
Let us know how old the unit is, where it sits, and how close the neighbouring wall and its windows are. On these blocks that last one decides what is possible.
Parts tested first, clearances measured before anything is ordered, and access down the passage included in the price.
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