Hot Water Repairs Hornsby | Mains Gas, LPG & Electric

What actually goes wrong with hot water here

The first thing worth establishing is what is feeding the unit, because this shire runs three different arrangements and they fail in different ways.

On the rural blocks the hot water is frequently LPG, fed from a pair of 45kg bottles. The single most common no-hot-water call out that way is not a fault at all, it is an empty bottle, and it costs nothing to check the changeover regulator before booking anyone. LPG also runs dearer per unit of energy than mains gas, which is worth factoring in when a system is due for replacement rather than discovering across a year of bottle swaps.

On mains gas and electric the story is the ordinary one, and it comes down to the anode. It is a sacrificial rod that corrodes so the steel tank does not, and when it is gone the cylinder is on its own. Almost nobody replaces one, which is the biggest avoidable cost on this page anywhere in Sydney.

One local qualification worth being honest about: this is higher, cooler ground than most of Sydney, and the valleys out toward Galston and Arcadia get genuinely cold mornings. Heat pumps work by pulling warmth out of the surrounding air, so their efficiency does drop when that air is cold. They remain a good option here and the space to site one properly is rarely a problem, but the brochure running costs assume milder conditions than a July morning up here.

Call 1300 381 569 Book a look

Mains, LPG or electricDiagnosed for what you actually have
Repair before replaceBoth numbers, honestly compared
Straight on heat pumpsIncluding where they are less suited
Licensed plumberNSW Licence 368473C, fully insured

Local hot water guide

What goes wrong with hot water in Hornsby

On LPG, check the bottles first

The most common no-hot-water call on the rural fringe is an empty bottle, and it is genuinely worth ruling out before anyone is booked. A changeover regulator with an indicator will usually tell you at a glance.

Two bottles on an automatic changeover is the arrangement that prevents this becoming an emergency: when one empties the regulator switches over and you have time to order a swap. A single bottle, or a manual changeover nobody watches, is how a Sunday gets ruined.

LPG running costs change the replacement maths

Bottled gas generally costs more per unit of energy than reticulated natural gas. That does not make gas hot water wrong on a rural block, but it does mean the long-run figures differ from what a mains-connected household would see.

So when a unit is due for replacement out there, the comparison worth doing is not just purchase price. It is purchase plus running cost across the life of the unit, and that sometimes points at electric or heat pump where it would not in town.

The anode, and why nobody replaces it

Inside every storage tank is a magnesium or aluminium rod that corrodes in place of the steel. It does its job right up until it is consumed, and then the cylinder is exposed.

Checking it is a small job. Replacing it is bigger but far cheaper than a changeover, and on a sound tank between five and ten years old it is usually the best money you can spend. We will tell you honestly when a tank is too far gone to be worth it.

Heat pumps, and the cold-morning caveat

A heat pump extracts warmth from the surrounding air, so the colder the air the harder it works. On the plateau, and especially in the valley pockets, mornings are meaningfully colder than coastal Sydney.

Modern units cope with that far better than early ones, and the space these blocks offer means siting for airflow is easy. But we will show you realistic running costs for this climate rather than the brochure number, because that is the honest basis for the decision.

Long runs on acreage

On a large block the hot water unit can sit a considerable distance from the furthest bathroom, which means a long wait and water down the drain every time that tap opens.

It is not a fault, and it is not always worth fixing, but a changeover is the natural moment to ask whether relocating the unit or adding a second point of supply makes sense. Most people are never offered that conversation.

What we can do on the first visit

Diagnose the fault, or confirm it is simply an empty bottle
Replace elements, thermostats and relief valves from the van
Check and replace a spent anode where the tank is still sound
Service and certify LPG hot water installations
Price a heat pump with realistic running costs for this climate

Call 1300 381 569

Our Hornsby service area

Map data © OpenStreetMap contributors, tiles © CARTO.

Which system, when the gas supply is not a given

Most hot water advice quietly assumes mains gas is available. Across a good part of this shire it is not, and that removes an option before the conversation starts.

Where there is no mains gas the real choice is between LPG, electric storage and a heat pump, and it turns on running cost rather than purchase price. Space is not the constraint here that it is closer to the city, which widens the field usefully.

Indicative service life. What you actually get depends on how hard the system is worked and whether the anode has ever been changed.
System	How it heats	Typical life	Suits
Electric storage	An element heats a tank, often overnight on a controlled load tariff	8 to 12 years	Anywhere without mains gas, where a cheap like-for-like swap is the priority
Gas storage	A burner under the tank, reheating through the day	8 to 12 years	The rail corridor suburbs with reticulated gas at the meter
Continuous flow	Heats on demand, so there is no tank to run out	15 to 20 years	Households with uneven demand. On LPG, watch the running cost
Heat pump	Moves heat from the surrounding air, like a fridge in reverse	10 to 15 years	Blocks with space. Efficiency does fall on genuinely cold mornings
Solar with boost	Roof collectors with electric or gas backup	15 to 20 years	Open north-facing roof, which acreage blocks often have

Sizing, roughly

A starting point rather than a rule. A household showering back to back within an hour needs more than the same number spread across a morning.

Continuous flow is rated in litres per minute rather than capacity, so it is sized on peak demand rather than household size.
People in the home	Electric storage	Gas storage	Continuous flow
1 to 2	125 L	135 L	16 to 20 L/min
3 to 4	160 to 250 L	135 to 170 L	20 to 26 L/min
5 or more	250 to 315 L	170 L or more	26 to 32 L/min

What hot water work costs around Hornsby

Fixed price agreed before anything starts. Indicative 2026 Sydney ranges for guidance, not quotes.

Call-out and diagnosis $120 – $220

Someone out to establish what has actually failed, gas supply included.

Element or thermostat $250 – $500

The most common repair on an electric storage tank, and usually the same visit.

Anode replacement $300 – $550

Worth doing on a sound tank at five to ten years. Adds years for a fraction of a swap.

Like-for-like changeover $1,400 – $2,800

Same type and size, common brands, generally completed the same day.

Heat pump or continuous flow $2,500 – $5,000+

Before the NSW discount and federal certificates, which usually come off up front.

How a hot water job runs.

Step 01

Taking a hot water call for a Hornsby home

What is feeding it?

Mains gas, LPG bottles or electric. On bottles we check the regulator first, because an empty bottle is not a hot water fault.

Step 02

Checking the valves and fittings on a Hornsby hot water unit

Both numbers, side by side

Repair against changeover, honestly, and on LPG the running cost comparison as well as the purchase price.

Step 03

Replacing a hot water system at a Hornsby property

Done the same day where we can

Common elements, thermostats, valves and popular tank sizes are stocked, so most jobs finish on the first visit.

Step 04

Completed hot water changeover in Hornsby

Tested, certified, taken away

Temperature checked at the tap, tempering valve verified, gas work certified, and the old unit removed for recycling.

Hot water questions, answered.

What Hornsby locals ask us before booking a plumber.

Ask us yours Licensed plumbing van covering Hornsby and the surrounding suburbs

No hot water this morning. What can I check first?

If you are on LPG, check the bottles before anything else, because an empty bottle is the most common cause out that way and it costs nothing to rule out. Look at the changeover regulator: if it has an indicator showing empty, you are simply out of gas. If you are on mains gas, check the pilot or ignition and that the gas is on at the meter. If it is electric, check the switchboard and whether it runs on a controlled-load tariff that only heats overnight.

Does LPG hot water cost more to run than mains gas?

Generally yes, per unit of energy, and it is worth knowing that before you choose a system rather than after the first bottle swap. That is not an argument against gas hot water on a rural block, because the alternatives have their own constraints, but it does change the maths on whether a continuous flow unit or a heat pump is the better long-run choice for your household. We will talk through both rather than assume.

We run out mid-shower and then it comes back. Why?

On LPG that is usually a bottle emptying and the changeover regulator doing its job with a brief interruption, rather than a fault in the unit at all. On a storage system it is more likely capacity: the tank is emptied faster than it reheats. The two feel similar in the shower and have completely different fixes, so tell us whether it recovered in minutes or in hours, because that single detail usually settles it.

Are heat pumps a good idea up here?

More qualified than elsewhere, and we would rather say so. A heat pump moves heat out of the surrounding air, so its efficiency falls as that air gets colder. This part of Sydney sits higher and gets genuinely cold mornings, and the valley pockets out toward Galston and Arcadia are colder again. A heat pump will still work, and modern units handle it far better than early ones did, but the running-cost figures in a brochure are usually quoted for milder conditions. On the plus side, space is one thing these blocks have, so siting one properly for airflow is rarely the problem it is closer to the city.

What actually kills a hot water system?

The anode, most of the time. It is a sacrificial rod inside a storage tank that corrodes so the steel cylinder does not, and once it is consumed the tank starts going. A tank that has started going cannot be repaired. Almost nobody replaces an anode, which is why so many units are scrapped years earlier than they had to be. It is a modest job at around five to seven years that adds years to the unit.

Is it worth repairing or replacing?

Age decides it more than the fault. Under about eight years most failures are a single part: an element, a thermostat, a valve, sometimes an anode. Those are worth repairing and usually same day. Past twelve years on a storage tank you are generally looking at a corroded cylinder, which has no repair. We will give you both numbers honestly rather than steering you at the bigger invoice.

Can I get the NSW discount on a heat pump?

Often yes. The NSW Energy Savings Scheme applies an upfront discount to the installer's quote rather than a rebate afterwards: up to $640 when a heat pump replaces an old electric water heater and up to $330 when it replaces gas, depending on the model. Only installers partnered with an Accredited Certificate Provider can apply it, so ask any quote whether it is included and who the provider is.

Hot water repairs and
replacement in Hornsby

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What actually goes wrong with hot water here

Cold this morning, hot again this afternoon.