Hot water maintenance schedule for South East Melbourne

Printable schedule

The hot water maintenance checklist, grouped by how often it needs doing

Print this and stick it inside the laundry cupboard door, or tick it off on your phone. Ticks are saved in this browser only. The DIY sections need no tools and no licence. The professional sections are licensed work in Victoria and are on here so you know what you are paying for.

Every 6 months · DIY · about 10 minutes

Lift the relief valve lever for about 5 seconds and let it snap back. Water should gush, then stop cleanly. Stand clear, it is scalding.
Walk around the unit looking for rust streaks, staining or flaking at the base and at every pipe joint.
Put a hand on the concrete pad or the floor beneath: it should be bone dry, every time.
Check the relief drain pipe still points at a safe discharge point and its outlet is not blocked by soil, mulch or a spider nest.
Run the hottest bathroom tap for a minute and check the temperature feels safe, not scalding. A tempering valve is meant to hold delivery to no more than 50 degrees C at personal hygiene outlets.
Clear leaf litter, weeds and stored junk from within half a metre of the unit, and from a heat pump evaporator.

After a storm, blackout or heatwave · DIY

Check the switchboard: heat pumps and off-peak electric units very often just need the breaker reset after an outage.
Check the pilot light on an older gas storage unit. Strong wind through an exposed side yard blows them out.
Clear storm debris, bark and small branches from around and on top of the unit and off any solar collector.
After a hail event, look at a solar collector for cracked glazing and at a heat pump for flattened fins.
If the power was off for a long stretch in summer, check the controller has come back with the right time and the right heating window.

Every season · DIY · two minutes each

Autumn: clear eucalypt and wattle litter from the heat pump evaporator and from around a gas unit air inlet before the leaves get wet and pack down.
Winter: check the heat pump condensate line is draining and not iced up on frosty mornings, which is a real thing in the Beaconsfield and Officer foothills.
Spring: look for spider webs and mud wasp nests around a gas burner compartment and flue, the classic cause of a pilot that will not stay lit.
Summer: check nothing has been stacked against the unit during the year and that airflow around a heat pump is still clear.
Any season: after a household change, more people or fewer, check whether the recovery still matches the morning demand.

Once a year · DIY

Photograph the compliance plate and file it with the invoice, the certificate and the warranty expiry date.
Note the install year and count forward. At 8 years start budgeting, at 10 to 12 years start planning the replacement.
Check the pipe insulation on exposed hot pipework has not perished in the UV, and that lagging is intact.
Look at the tank stand, pad or bearers for movement or cracking. Reactive clay in Clyde, Officer and Cranbourne East moves ground more than people expect.
On a solar system, check the collector glass is clean and the roof frame fixings are still tight from the ground, not the roof.

Once a year · licensed plumber or gasfitter

Full service and safety check on any storage unit past 8 years: $150 to $300.
Gas appliance check on gas units: burner, flame picture, flue draw and combustion clearances.
Anode inspection from year 5, with replacement when it is consumed: $220 to $380.
Sediment flush on an older electric storage unit where the water runs discoloured or the tank rumbles.
Heat pump service: evaporator clean, filter, condensate, refrigerant circuit check, control settings: $150 to $250.
Rental properties: the two yearly gas safety check by a licensed or registered gasfitter, with the record kept on file.

Every 5 years · licensed plumber only

Replace the tempering valve: $220 to $380. They drift out of calibration and most manufacturers nominate a 5 year replacement.
Replace the pressure and temperature relief valve: $180 to $280. They corrode shut, and a stuck one on a pressure vessel is the worst failure mode there is.
Replace the anode if it was not done at the last inspection: $220 to $380.
Check mains pressure and the pressure limiting valve: $250 to $450 to replace. High street pressure shortens tank life and voids warranties.
Solar systems: check and replace the heat transfer fluid and the collector seals per the manufacturer schedule.

Never do these yourself

Do not replace an element, a thermostat or an anode yourself. It is licensed work on a pressure vessel and it voids the warranty.
Do not wind the thermostat up past the manufacturer setting to get more hot water. That is how scalds happen.
Do not touch gas pipework, flues or burner components. Type A gasfitting is licensed work in Victoria.
Do not cap, extend or redirect a relief valve drain line. It has to discharge safely and visibly.
Do not hose down a heat pump or pressure wash the fins. Brush and rinse gently, with the power off.

What actually kills hot water systems in this part of Melbourne

Maintenance advice written for the whole country misses what matters locally. Here is what genuinely shortens the life of a unit across Casey and Cardinia.

Cold winter inlet water. Mains water arriving at around 10°C in July, against roughly 20°C in January, means the unit has to lift every litre by an extra 10 degrees to reach the same 60°C storage temperature. Elements and burners work harder and longer through winter, which is exactly why most failures here happen between May and August, not in the heat.
Anode depletion, not scale. Melbourne draws from protected catchments and the water is soft, so limescale is a much smaller issue here than in Adelaide or Perth. Our tanks fail from the inside because the sacrificial anode has been consumed and nobody replaced it. That is the single highest-value maintenance item in this region.
Frost in the foothills. Beaconsfield Upper, Officer and the higher parts of Berwick get genuine frost. Heat pump efficiency drops as ambient temperature falls, condensate lines can freeze, and exposed pipework needs proper lagging. If you are choosing a heat pump for a frost pocket, ask specifically about performance at low ambient temperatures rather than the headline efficiency figure.
Tree litter. Eucalypt and wattle debris packs into heat pump evaporator fins and settles on solar collectors. A blocked evaporator makes the compressor work harder for less output, and it is a five minute job to prevent.
Reactive clay. Much of Clyde North, Officer and Cranbourne East sits on reactive clay that moves seasonally. That movement stresses rigid connections and tank stands, and it is worth a look at the pad and the pipework once a year.
Storms and outages. Summer storms take the power out, which resets heat pump controllers and off-peak timers, and strong wind blows out pilot lights on exposed older gas units. Neither is a fault, but both generate callouts we could all do without.
Salt air, only near the water. This is not a Berwick problem. Down toward Tooradin and Warneet on Western Port it is real, and stainless or coated components earn their money there. Anywhere inland, salt corrosion is not what is killing your tank.

The cost of neglect, in real numbers

Maintenance is only worth doing if the sums work. Here they are, using 2026 South East Melbourne prices.

What you skip	What it saves now	What it costs later	Net position
Anode inspection and replacement at 5 to 7 years	$220 to $380	A cylinder that fails at 8 to 10 years instead of 12 to 15: $1,500 to $2,800 brought forward by 4 or 5 years	You lose roughly $1,200 to $2,400 of remaining tank life
Twice yearly relief valve lift	$0 and 30 seconds	A seized valve, an over-pressurised tank, and in the worst case a burst: $1,500 to $2,800 plus water damage	The best free job in plumbing
Tempering valve replacement at 5 years	$220 to $380	Scalding water at the tap, a genuine burn risk for children and older people, and a failed inspection item at sale	Safety, not just money
Clearing a heat pump evaporator yearly	$0 and five minutes	Longer run times, higher power bills and premature compressor wear on a $2,400 to $4,200 unit	Free efficiency
Fixing a weeping relief drain when you first see it	$180 to $280	Rotted framing, a damaged floor and a claim your insurer may decline as gradual damage	Small money, large exposure
Annual service on a unit past 8 years	$150 to $300	Failures happen unannounced, usually in July, at $180 to $350 after-hours attendance instead of a planned booking	Roughly break-even in cash, much better in timing

Full parts and replacement pricing is on the pricing page. If it has already failed, start with the first hour instructions.

What service life you should actually expect

These are the working lives we see across Berwick, Narre Warren, Hampton Park and Endeavour Hills, with maintenance and without it. Warranty length is not the same thing as service life, and both matter.

System type	Typical life, maintained	Typical life, neglected	Replacement cost in 2026
Gas storage, 135 to 170 litres	12 to 15 years	8 to 10 years	$1,800 to $2,800
Electric storage, 250 to 315 litres	12 to 15 years	8 to 12 years	$1,500 to $2,400
Continuous flow gas	15 to 20 years	10 to 15 years	$1,900 to $3,200
Heat pump	10 to 15 years	7 to 10 years	$2,400 to $4,200 after rebates
Solar thermal, collectors	15 to 25 years	10 to 15 years	$3,800 to $6,500 for a full system
Solar thermal, storage tank	10 to 15 years	8 to 10 years	Tank only, priced on inspection

More detail on each of those, including how the warranties are structured, is on how long hot water systems last, and the symptoms that say a unit is close to the end are on the warning signs page.

What voids a manufacturer warranty

Warranty claims on hot water units get declined more often than people expect, and almost always for one of a short list of reasons. Cylinder warranties are commonly 5 to 10 years, heat pump compressors are typically shorter than the tank they sit on, and labour is nearly always separate from the part.

Installation by an unlicensed person, or with no compliance certificate. This is the big one, and it also affects insurance. See our compliance certificate page and the site's DIY versus licensed installer guide.
No tempering valve where one is required. Storage water is held at 60°C and above to control bacteria, and delivery to personal hygiene outlets is limited to a maximum of 50°C. Removing or omitting that valve is both a safety breach and a warranty exclusion.
Excessive mains pressure without a pressure limiting valve. Every unit has a maximum supply pressure printed on the plate. Exceed it and the manufacturer will point at it.
No maintenance on the relief valve or the anode. Several manufacturers specify these intervals in the warranty conditions, which is why a dated service invoice is worth keeping.
DIY parts and repairs. A homeowner-fitted element or thermostat ends the warranty on the whole unit, not just the part.
Wrong clearances or an illegal condensate discharge on a heat pump. Airflow clearances and drainage are install requirements, not suggestions.

What we will not sell you

Three honest constraints, because maintenance is where this trade oversells hardest.

We do not sell annual service plans for modern continuous flow gas units. They are the lowest maintenance hot water product available, and unless the water runs discoloured, the flame is unstable or the unit is throwing fault codes, a check every 2 to 3 years is plenty. Paying $200 a year for someone to look at a healthy Rinnai or Bosch unit is money you do not need to spend.

We do not fit water conditioners or filters to protect a hot water system. Melbourne water is soft. In hard-water parts of Australia those products have a job. Here, they are solving a problem you do not have, and the money is far better spent on the anode.

We will not sell you an anode for a tank past about 12 years. At that age the cylinder lining has usually already been compromised, and a $300 anode buys uncertain time on an asset that is close to done. We will tell you honestly to plan the replacement instead, and help you time it rather than have it timed for you in the middle of winter. Timing is covered on the best time to replace, and if the property is tenanted, the obligations are on our landlord urgent repairs page. Areas we cover are listed on the South East Melbourne page.

Hot water maintenance questions

How often should a hot water system be serviced in Melbourne?

Storage units, gas or electric, are worth a professional check every 2 years and then yearly once they pass 8 years, at $150 to $300 a visit. Heat pumps want a yearly look at the evaporator, the condensate drain and the filter. Continuous flow gas units are the low maintenance option and generally need a check every 2 to 3 years unless the water is discoloured or the flame is unstable. Between visits, the twice-yearly relief valve lift is the one job that pays for itself.

What is a sacrificial anode and when should it be replaced?

It is a magnesium or aluminium rod inside the tank that corrodes instead of the steel cylinder. It is the single reason a glass-lined tank lasts more than a few years, and it is consumed on a 5 to 7 year cycle in most South East Melbourne homes. Replacing it costs $220 to $380 and can roughly double the working life of a $1,500 to $2,800 cylinder. Once a tank is past about 12 years the maths flips and the money is better spent on the replacement.

How do I test the pressure relief valve myself?

Every 6 months, lift the small lever on the valve at the top or side of the tank for about 5 seconds and let it snap back. Hot water should gush from the drain pipe and then stop cleanly. If nothing comes out, or it keeps dribbling afterwards, the valve is failing and needs replacing at $180 to $280. Stand clear of the drain outlet: the water is stored at 60 degrees C and above and it will scald.

Do heat pump hot water systems need maintenance?

Yes, and the jobs are different from a tank. Keep the evaporator fins clear of eucalypt leaf litter and grass clippings, keep 300mm to 500mm of clear air around the unit, check the condensate drain is running away and not pooling, and rinse the filter where the model has one. In the Cardinia foothills also check the condensate line is not freezing on the coldest mornings. A yearly professional check runs $150 to $250 and the anode inside the tank still applies.

Does Melbourne water damage hot water systems?

Melbourne water from the protected catchments is soft, so scale build up is a far smaller problem here than in Adelaide or Perth, and descaling is rarely the reason a South East Melbourne tank fails. What does kill tanks here is anode depletion and sediment. That is why a 5 to 7 year anode at $220 to $380 matters more locally than any water treatment, and why we do not sell filters or conditioners for hot water systems.

What voids a hot water system warranty?

The common ones are installation by an unlicensed person or without a compliance certificate, no tempering valve where one is required, running the unit at mains pressure above its rating without a pressure limiting valve, no relief valve maintenance, and any DIY work inside the tank or on the gas train. Most manufacturers also require the unit to be installed with the correct clearances and, for heat pumps, a legal condensate discharge. Warranty on the cylinder is commonly 5 to 10 years, and labour is separate.

Get a price

Book the service, the anode or the valve replacement

Send the details and we will come back within one business day with a fixed price for the service and anything the unit is due for, before we start.

How to get 15 years out of a hot water system in South East Melbourne: the schedule