Riverstone · Sydney Wide · Hawkesbury · Penrith
info@fenechplumbing.com.au
Emergency Plumbing 24/7 — 0422 718 247
Replacement is never our starting position, whatever the age of the system. Whether a failed hot water system gets repaired or replaced comes down to what's actually wrong: the age of the system, what type and size it is, what's failed, and what it can realistically be replaced with. Age is the biggest factor. Around 10 years is a good run from a storage tank (some make 15 or even 20), and once a system is past 5 years old, a failure can start pointing to replacement rather than repair. Below that, a repair is usually the honest, cost-effective answer.
That's the short version. Here's how we actually work it out on site, what the warning signs are, and what to do if your tank has burst and is flooding.
When someone calls with "no hot water", the first thing we establish is whether it's one tap or every tap.
Sometimes we can narrow it down over the phone. On a tank system, a failed valve on the tank side can be the whole cause of a "no hot water" call, and we'll often ask you to carefully feel the pipes around the valve to help us work out what's going on before we arrive.
We go straight to the system itself:
On an instantaneous unit, age matters, and so does power: no power to the unit means no hot water, even on gas.
We take the most cost-effective, honest approach to fixing it. What tips the decision:
A valve repair costs a fraction of a replacement, so we'll never push you to a new system when a repair will genuinely do the job. It works the other way too: sometimes a unit can technically be fixed, but replacing it is the more cost-efficient call for the owner, and we'll say so and explain why. If you want a price for your specific situation, call us and we'll quote the job in front of us.
Three early giveaways worth knowing:
The second and third usually show up weeks before total failure.
If you're seeing the second or third of those, get it looked at before it fails completely. A planned replacement beats a cold shower and an emergency call every time.
A burst tank that's spraying water and can't be isolated is a drop-everything emergency. If you can't isolate the tank itself, shut the water main to the property. That kills hot and cold water to everything, and it stops more water feeding the leak. One thing to know: if the split is in the tank itself, the tank that's already full can keep draining until the pressure relieves and the water level drops below the hole, so don't be alarmed if it doesn't stop instantly. If the leak is at a valve rather than the tank, shutting the main may stop it altogether. Either way, shut the main, then call us.
If the tank is leaking but still working, you have a little more time, but not much, and it depends on how much water it's actually losing. A split tank keeps leaking while the system constantly reheats to compensate, wasting water and energy the whole time. For a minor leak, a day or two is fine; don't let it go more than 3 to 4 days. A heavier leak needs attention sooner. We prioritise these jobs and get out as soon as practically possible.
A Castle Hill family of four, two adults and two young children, woke one weekend morning to a hissing noise outside. Their hot water tank had burst and was spraying everywhere.
They did the right thing first: isolated the tank themselves, which stopped the flooding until we arrived. They called about 10am. Peter assessed the tank on site: it had split, and a split tank doesn't repair. On a weekend, a replacement usually means waiting. Instead, Peter sourced a replacement tank the same morning and swapped it that day.
Hot water was back on by early afternoon. From burst tank to hot shower in a few hours, on a weekend, for a family that couldn't reasonably go without.
Several calls a year follow this exact shape: burst tank, same-day sourcing, sorted that day. Plumbing emergencies don't wait, so neither do we.
The single biggest mistake we see: most people don't ever operate the pressure relief (PTR) valve. Every storage tank, gas or electric, has one, and it's good practice to manually release it every six months. Releasing it resets the valve seat so it doesn't seal itself shut. When it's never done, the seat seals off, excess pressure has nowhere to discharge, and that can cause the tank to eventually split at its weak spots. We see it in plenty of the burst tanks we replace.
Beyond that, tank maintenance is simple:
It's also worth knowing how to isolate your tank before you ever need to. If you don't know where the isolation valve is, the fallback is always the property's water main.
Hot water failures generally count as urgent repairs. Supplying hot water is a contractual obligation between landlord and tenant, and beyond the contract it's a hygiene issue: hot water is for washing yourself, the kitchen, the dishes. A day without it mid-summer might be okay; days on end, or any stretch in winter, isn't acceptable. A burst, leaking tank can be urgent on its own for the water damage, separate from the no-hot-water side.
When a tenant reports no hot water, the agent usually only knows exactly that: no hot water. We liaise with the tenant directly and attend to assess the cause, so you don't have to play middleman on technical questions. We aim for same-day assessment and ideally a repair on the day. If it needs replacing, we can usually quote on the spot, or send the quote through if your agency prefers. And where a full replacement is waiting on landlord approval, we can sometimes do a temporary repair to keep the tenant in hot water until the quote is approved. If the tank is completely burst there's no temporary fix, but we'll tell you that straight and have the quote ready.
Two habits that make portfolio hot water cheap to manage:
Both habits are covered in the Property Manager's Hot Water Cheat Sheet, a free one-page record you can download and keep for each property.
Any new or replacement tank hot water installation requires a tempering valve. It regulates delivery temperature to 50 degrees or slightly lower, preventing scalding and third-degree burns. Any new instantaneous unit must be 50-degree compliant; if it isn't, it needs a tempering valve as well. We handle this as part of every install.
Fenech Plumbing & Gas services The Hills, the Hawkesbury and the Nepean, and Sydney Metro-wide. Whether it's a burst tank, brown water, or a system that's just quietly getting old, call us and we'll tell you honestly whether it's a repair or a replacement, and why.
Call Fenech Plumbing & Gas on 0422 718 247. Licence 386329C.
Property managers: see how we work with real estate and property managers, or read our guide to triaging a tenant's blocked sewer report, or see how we work as a strata plumber across Sydney.
Almost certainly not. Hot water missing from a single tap usually means the problem is that tap itself, often just a washer, rather than the hot water system. It's a small job. If no tap in the house has hot water, that's when the system itself is the likely cause, and it's worth a call either way.
Around 10 years is a good average run from a storage tank, though we've seen tanks go 15 and even 20 years; less common, but it happens. Once a system is past 5 years old, a failure can start pointing to replacement rather than repair, and getting close to the 10-year mark is itself a warning sign. Age is the biggest single factor in the repair-or-replace decision.
Replacement is never our starting position, whatever the system's age. We look at the age, the type and size, what's actually failed, and what it can realistically be replaced with. A failed valve or power issue is a repair. A split, leaking tank is a replacement. And occasionally a unit that can be fixed is still more cost-efficient to replace; if that's the case we'll say so and explain why. The most cost-effective, honest answer for you is the job.
Three early giveaways, often weeks before total failure: the system getting close to the 10-year mark, lower hot water pressure than you're used to, and brown or rusty-coloured hot water. The brown water is the main indicator. If you're seeing it, get the system assessed before you're stuck with a cold shower and an emergency.
Brown or rusty-coloured hot water is the main indicator a hot water heater is on its way out. Get it assessed before it fails completely.
Isolate the tank if you can. If you can't find or turn the tank's isolation valve, shut the water main to the property. That cuts hot and cold water to everything and stops more water feeding the leak. If the split is in the tank itself it may keep draining for a while until the water level drops below the hole, so don't panic if it doesn't stop instantly. Then call us. A burst tank that's flooding and can't be isolated is a genuine emergency and we treat it as one.
Depends how much water it's losing. A minor leak can wait a day or two, but not more than 3 to 4 days; a heavier leak needs attention sooner. Either way a split tank keeps leaking while the system constantly reheats to compensate, so it wastes water and energy the whole time it sits. We prioritise leaking tanks and get out as soon as practically possible.
A big one is the pressure relief (PTR) valve never being operated, and most people never do. Every storage tank has one, and it's good practice to manually release it every six months to reset the valve seat. When that's never done, the seat can seal shut, pressure has nowhere to discharge, and that can cause the tank to eventually split at its weak spots. We see it in plenty of the burst tanks we replace.
Not much, but the little there is matters: release the PTR valve every 6 months, replace the sacrificial anode around the 5 year mark, and replace the relief valve every couple of years. Beyond that, keep an eye out for brown or discoloured water. Those small jobs genuinely extend a tank's life.
Sometimes, but it depends on the property. An instantaneous unit needs a 20 mm gas line, so if the property has a 15 mm line, it's ruled out without re-piping. For electric tanks, whether you're on off-peak or on-peak power also shapes the options. We assess what your property can actually support and explain the choices.
Yes. Any new or replacement tank installation requires a tempering valve, which limits delivery temperature to 50 degrees or slightly lower to prevent scalding. New instantaneous units must be 50-degree compliant or fitted with a tempering valve as well.
Generally yes. Supplying hot water is a contractual obligation between landlord and tenant, and a hygiene issue beyond that. Hot water failures need attending to as soon as possible, especially in winter. Our free download, the Property Manager's Hot Water Cheat Sheet, covers what to keep on record for each property.
It depends entirely on what's wrong and what your property needs. A valve repair costs a fraction of a full replacement, which is exactly why we diagnose before we recommend anything. Call us on 0422 718 247 and we'll quote the job in front of us, upfront and fixed.
