Hot Water Systems Inner West | Repairs & Replacement

One system, two households, and nobody coordinates

A great many houses across this region are no longer one dwelling. Terraces have been split into flats, rear additions have become self-contained, and a house built for one family now holds two households. The hot water system is usually the one that was there before all of that.

The complaint that follows is always the same: it never lasts. And the instinct is always the same too: the system must be faulty. Usually it is not. It is doing exactly what it was designed to do for a household that no longer lives there.

The reason is timing rather than headcount. Four people in one household stagger without thinking about it, because they know each other's routines and they can hear the shower. Two separate households have no reason to coordinate and no way to. So the demand stacks into the same window instead of spreading across the morning, and a tank that is perfectly healthy empties.

That opens up more options than buying something bigger. A faster recovering unit, or continuous flow which cannot run out at all, or in some cases separating the supplies so each dwelling has its own system and its own running cost. That last one frequently solves the argument as well as the hot water.

Call 1300 381 569 Book a look

Capacity separated from faultBefore anything gets condemned
Timing, not headcountWhich is why the usual sizing advice misses
Separation consideredIt splits the running cost as well as the demand
Licensed plumberNSW Licence 368473C, fully insured

Regional hot water guide

Hot water in inner west housing

The system predates the split

A house divided into two dwellings usually keeps the hot water it already had.

Sized for one household with one routine.

Separate households do not stagger

One family spreads demand without thinking. Two households cannot.

So the peak stacks instead of spreading.

A healthy tank still empties

Capacity is drawn down by what is taken in the same forty minutes.

That is arithmetic rather than a fault.

Separation solves more than flow

Two systems means two running costs, which is frequently the real friction.

Whether it is possible is a look at the property rather than a phone answer.

Soft supply, so it is the anode

Nothing silts up here. The anode corrodes deliberately so the cylinder does not.

Renew it and you buy years for a fraction of a replacement.

What we repair and replace

Electric and gas storage systems
Continuous flow, heat pump and solar
Supplies separated where two dwellings share one system
Anodes, elements, thermostats and valves
Sizing done for how the house is actually used

Call 1300 381 569

Where we work across the inner west

Suburb boundaries © Australian Bureau of Statistics, ASGS 2021, used under CC BY 4.0.

The five options, judged on how they behave under stacked demand

The usual comparison is capacity and running cost. On a house holding two households the question is different: what happens when the demand arrives all at once.

Service life here is a guide rather than a promise. Heavy use, no maintenance, or a position nobody can reach will shorten any of them.
Type	How it behaves when demand stacks	Expected span	Worth considering when
Electric storage	Empties, then recovers slowly	About 8 to 12 years	Demand genuinely does spread across the day
Gas storage	Empties, but recovers noticeably faster	About 8 to 12 years	Gas is connected and mornings are the pinch point
Continuous flow	Cannot empty, because nothing is stored	About 15 to 20 years	Running out is the actual complaint
Heat pump	Empties, moderate recovery, cheapest electric to run	About 10 to 15 years	There is outdoor space with genuine airflow
Two separate systems	Each household limited only by its own use	As per the type chosen	The running cost is as much the issue as the hot water

Sizing it for the household that exists now

Count the people who want hot water inside the same hour, and count separate households as though they will overlap, because they will.

Continuous flow carries a flow rate instead of a capacity, because nothing is held in reserve to run out of.
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 separate households	Size up a step	Size up a step	26 L/min

What hot water work costs across the inner west

Fixed price agreed before anything starts. These are indicative 2026 ranges.

01

Diagnosis and report $120 – $250

Comes straight off the repair if you tell us to go ahead.

02

Element or thermostat replaced $250 – $550

Two parts account for the overwhelming majority of electric failures.

03

Anode replaced $300 – $600

Buys years on a cylinder that is otherwise sound.

04

Storage system replaced $1,400 – $2,800

One number covering the appliance, fitting it, and removing the old one.

05

Supplies separated quoted

Where two dwellings would be better with their own system and their own bill.

How a hot water call-out runs.

Step 01

Booking a hot water call-out across the inner west

We ask how the house is used

Type and age of the unit, and how many separate households draw on it. That last one is the question nobody expects.

Step 02

Diagnosing a hot water system in the inner west

Aged off the plate

Every unit carries a compliance plate with a date, and we read it out, because a real age turns repair or replace into arithmetic.

Step 03

Replacing a hot water system in the inner west

The cheapest honest fix

Anode, element or thermostat where that solves it. A changeover only where the unit is genuinely finished or genuinely too small.

Step 04

Completed hot water installation in the inner west

Proven at the tap

We run it, check the delivered temperature, take the old unit away and leave you the paperwork.

Hot water questions.

What the Inner West locals ask us before booking a plumber.

Ask us yours Licensed plumbing van covering the Inner West and the surrounding suburbs

The house has been split into two flats and the hot water never lasts. Is the system faulty?

Frequently not. It is far more often a system doing exactly what it was designed to do for a household that no longer exists. A storage unit sized for one family with one morning routine is being asked to serve two households with two, and two households do not coordinate their showers.

Why does that matter more than the number of people?

Because of timing. Four people in one household tend to stagger, because they know about each other. Two separate households have no reason to, so peak demand doubles up rather than spreading out. The tank does not care how many people there are, it cares how much is drawn in the same forty minutes.

So do we just need a bigger tank?

Sometimes. The options are more interesting than that though: a larger unit, a faster recovering one, a continuous flow system that cannot run out at all, or in some cases separating the supplies so each dwelling has its own. Which is right depends on the property and on what the two households actually want.

Can each dwelling have its own system?

Sometimes, and it is worth asking about because it also separates the running cost, which is frequently the real source of the friction. Whether it is possible depends on space, on the fuel available, and on what the building will allow, and that is a look rather than a phone answer.

Why do tanks fail here if the water is soft?

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.

The tank is leaking. Repair or replace?

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.

What does hot water work cost across the inner west?

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.

Hot water systems
across the Inner West

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One system, two households, and nobody coordinates

Two households, one tank?