Questions

Straight answers to 173 of the most-asked Gold Coast plumbing questions.

No filler, no upsell. Real 2026 pricing, real Gold Coast context, real local knowledge. If you cannot find your question here, call us on 0472 657 042 and we will give you a straight answer on the phone.

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Hot water

Choosing, sizing, replacing and maintaining hot water systems on the Gold Coast.

How long does a hot water system last on the Gold Coast?On the Gold Coast a hot water system lasts about 8 to 12 years for electric storage and 7 to 12 years for gas storage. Gas continuous flow units go 9 to 15 years and heat pumps 10 to 15. In our coastal suburb jobs, salt air commonly cuts those figures by roughly 25 to 30 percent versus inland, so a beachside tank at 9 years is doing well.Read more
Is a heat pump hot water system worth it on the Gold Coast?Yes, for most Gold Coast households of 3 or more, a heat pump is worth it, paying back the extra install cost in 2 to 4 years. Installed it runs $2,500 to $4,500 after the federal STC rebate, and daily running cost is roughly 40 to 60 percent less than gas continuous flow. After payback you keep saving for the unit's 10 to 15 year life. Small one-person households take longer to recoup it.Read more
What size hot water system do I need?For a Gold Coast household, 1 to 2 people suit a 125 to 160L tank, 3 to 4 people 250 to 315L, and 5 or more 400L plus. For continuous flow, 26L/min covers 3 to 4 people and 32L/min covers 5 or more. Heat pumps are sized by tank volume, and 270 to 315L suits most families. Daily peak usage matters more than headcount, so count simultaneous showers.Read more
How much does it cost to replace a hot water system on the Gold Coast?Replacing a hot water system on the Gold Coast costs $1,300 to $2,400 for electric storage and $1,800 to $3,200 for gas storage, like-for-like. Gas continuous flow runs $1,900 to $3,500, and a heat pump $2,500 to $4,500 after the federal STC rebate. Solar hot water is quoted on inspection. Coastal installs sit toward the top of each range because of the salt-rated parts and valves we fit.Read more
Why is my hot water unit leaking from the bottom?A leak from the bottom of a storage hot water unit almost always means the inner tank has rusted through. There is no field repair for this, the tank is sealed and once it fails, the unit needs replacement. Turn off the water supply to the unit immediately and book a replacement call.Read more
Should I switch from electric to gas hot water?Probably not: in 2026 the better switch from electric storage is to a heat pump, which costs less to run than both gas continuous flow and electric storage. A heat pump installs for $2,500 to $4,500 after the federal STC rebate, against $1,900 to $3,500 for gas continuous flow, and the running cost gap pays back the difference in 2 to 4 years. Gas still makes sense where you already have gas and very high simultaneous demand.Read more
What is the federal STC rebate on a heat pump?The federal STC rebate is a point-of-sale discount on a heat pump hot water system, applied to your invoice by the installer under the Small-scale Technology Certificate scheme. The value depends on the unit's STC rating and the spot STC price on the day, so we confirm it at quote time. There is no separate paperwork for you. With the rebate applied, an installed heat pump on the Gold Coast runs $2,500 to $4,500.Read more
How do I extend the life of my hot water system?Replacing the sacrificial anode at 5 and 10 years adds 4 to 6 years to a storage hot water tank's life. Beyond that, keep the thermostat at 60 to 65 degrees, mount the unit on a sheltered wall in coastal suburbs, do an annual visual check for leaks and rust, and flush sediment every 5 years on continuous flow units. The anode swap is quoted on inspection.Read more
What is the best hot water system for a coastal Gold Coast home?For most coastal Gold Coast homes the best hot water system is a heat pump on a sheltered south or west wall. It has the lowest running cost, the federal STC rebate brings it to $2,500 to $4,500 installed, and the composite casing is more salt-tolerant than steel-cased gas units. Gas continuous flow on a sheltered wall is the second choice for very high simultaneous demand.Read more
Why does my hot water keep running out?Hot water keeps running out for one of three reasons: an undersized tank, a thermostat set too low, or a failing element or burner not recovering between uses. Continuous flow units run out when the flow rate is exceeded or the gas supply is undersized. Diagnose first, then size correctly on replacement: a 3 to 4 person household needs 250 to 315L of storage or a 26L/min continuous flow unit.Read more
How much does hot water system replacement cost on the Gold Coast?Hot water system replacement on the Gold Coast costs $1,300 to $2,400 for electric storage and $1,800 to $3,200 for gas storage, like-for-like. Gas continuous flow runs $1,900 to $3,500 and a heat pump $2,500 to $4,500 after rebates. Most systems we replace here fail between 8 and 12 years old, usually with a leaking tank, and we register the Form 4 with QBCC after every changeover.Read more
What size heat pump hot water system do I need?You need roughly 50 litres of heat pump tank per person per day: a couple suits a 200L unit and a family of four suits 250 to 300L. An installed heat pump on the Gold Coast costs $2,500 to $4,500 after rebates. Size for your peak, not your average: most undersized systems we replace were chosen on price, not household size, and a heat pump recovers slower than gas so it cannot catch up mid-morning.Read more
How much does a gas hot water system cost installed on the Gold Coast?A gas hot water system installed on the Gold Coast costs $1,800 to $3,200 for storage and $1,900 to $3,500 for continuous flow, based on a like-for-like changeover. Relocations and gas supply upgrades add to those figures and are quoted on inspection. Most gas changeovers we do are finished the same day, with the compliance certificate and Form 4 lodged afterwards.Read more
Why is my hot water not working?No hot water usually comes down to one of four faults: a tripped breaker, a failed element or thermostat, a pilot light out, or a leaking tank. Check the switchboard or relight the pilot once before calling. A leaking tank means replacement, not repair, at $1,300 to $2,400 for electric storage or $1,800 to $3,200 for gas storage. Most no-hot-water calls we take on the Gold Coast are one of those four.Read more
Should I repair or replace my hot water system?Repair a hot water system under 8 years old and replace one over 12; in between, the fault decides, and a leaking tank is always a replacement. Elements, thermostats and valves are worth fixing on a younger unit; a rusted tank is not. Most storage tanks we swap out here are 10 to 14 years old, coastal conditions shorten that, and a like-for-like electric replacement runs $1,300 to $2,400.Read more
Continuous flow vs storage hot water: which is better?For most households of 1 to 4 people, gas continuous flow wins on lifespan and endless hot water, while storage wins on upfront cost and simple electric installs. Installed, continuous flow runs $1,900 to $3,500 against $1,300 to $2,400 for electric storage. The deciding factor is simultaneous use: continuous flow can struggle when 2 or more showers run at once unless sized properly, and that is where a 315L tank still earns its place.Read more
Should I replace my solar hot water system with a heat pump?If your solar hot water system has failed, replace it with a heat pump at $2,500 to $4,500 after rebates; if it is repairable, repair it. A heat pump is the simpler changeover: no roof work, no collectors, easier servicing, and the lowest running cost of the mains-powered options. A healthy solar system can still edge a heat pump on running cost in Queensland, though, so a cheap fix on a working system is worth doing.Read more
What hot water rebates can I get in Queensland?Queensland households replacing a hot water system with a heat pump can typically access $1,000 to $2,500 in combined incentives, mainly federal STCs plus any current state scheme. The federal STC discount is applied on your invoice by the installer; state schemes open and close mid-year, so we confirm exact figures at quote time on every Gold Coast job. With rebates applied, an installed heat pump runs $2,500 to $4,500.Read more
What is a tempering valve and do I need one?A tempering valve blends hot and cold water so bathroom taps deliver no more than 50 degrees while the tank stores at 60 degrees to kill Legionella. Yes, you need one: in Queensland it is required on new and replacement hot water installs, so it goes in with every changeover we do. Older Gold Coast homes frequently have no valve at all, which is a scald risk for kids and elderly residents.Read more
Can I install my own hot water system in Queensland?No. In Queensland, installing or replacing a hot water system is regulated work under the Plumbing and Drainage Act 2018 and needs a licensed plumber. Gas systems also need a licensed gas fitter, and every replacement is notifiable work the plumber lodges with QBCC on a Form 4. Most failed DIY installs we fix on the Gold Coast cost more to put right than the licensed job would have.Read more
How long does it take to install a hot water system?A like-for-like hot water changeover on the Gold Coast usually takes 2 to 4 hours, and as of 2026 we complete most swaps the same day. Fuel switches, such as gas storage to a heat pump, can take one to two days. The most common delay we see is old pipework and valves that need upgrading to current standards.Read more
Why is my hot water relief valve dripping?A slow drip from your relief valve during heating cycles is normal, it can release up to a litre a day as water expands. A constant stream is not. As of 2026 the most common fault we find on Gold Coast tanks is a PTR valve that has failed after 5 or more years without testing.Read more
What is a sacrificial anode and how often should it be replaced?A sacrificial anode is a metal rod inside your storage tank that corrodes so the steel tank does not. Replaced every 3 to 5 years it can roughly double tank life. As of 2026, most failed Gold Coast tanks we see have an anode that was never once replaced.Read more
What temperature should my hot water system be set to?In Queensland your storage tank must hold water at 60°C to control Legionella, while a tempering valve limits bathroom taps to 50°C. Those numbers are set by law, not preference, as of 2026. The most common issue we find in older Gold Coast homes is a tempering valve that was never fitted.Read more
Why does my shower go cold when someone turns on a tap?When someone opens a tap it drops pressure on one side of your shower mixer, and older mixers cannot rebalance quickly, so the temperature swings. As of 2026 the most common causes we find in Gold Coast homes are ageing mixer cartridges and mains pressure sitting above the 500 kPa limit applied to new Queensland homes.Read more
Why does my gas hot water pilot light keep going out?A gas hot water pilot light that keeps going out is most often a worn thermocouple, the safety sensor that holds the gas valve open. They typically fail after 8 to 10 years and are a cheap part to replace. Draughts, a dirty pilot jet or a failing gas valve are the other causes. It is safe to relight once, but if it will not stay lit, stop and call a licensed gas fitter.Read more
Why is my hot water system making rumbling or popping noises?Rumbling and popping from a storage tank is almost always sediment cooking on the element or tank base, and it is an early failure warning. As of 2026 the noisiest tanks we see on the Gold Coast are electric units past 8 years old that have never been flushed or serviced.Read more
Why is my hot water brown or rusty?Brown water from the hot taps only usually means your storage tank is corroding from the inside, and that is a replacement conversation, not a repair. If both hot and cold run brown, suspect mains works or disturbed sediment instead, and it usually clears in an hour. On the Gold Coast we mostly see corroding tanks past 10 years old, and a like-for-like electric replacement runs $1,300 to $2,400.Read more
How long does a hot water system take to heat up?From cold, a gas storage tank heats in 60 to 90 minutes, an electric tank in 2 to 4 hours, and a heat pump 3 to 5 hours. Continuous flow is instant, and an electric tank on off-peak tariff heats overnight rather than on demand. Most slow Gold Coast systems we attend are off-peak electric tanks doing what their tariff tells them to, not faulty units.Read more
No hot water? What to check before you call a plumberBefore calling a plumber, check three things: the pilot light on a gas unit, the breaker on an electric one, and the relief valve on any tank. Relight the pilot once using the sticker instructions on the unit. Reset the breaker once and allow two hours to reheat. If the relief valve is running constantly, or any of these fail a second time, the fault needs a licensed plumber.Read more

Gas fitting

Gas cooktops, compliance certificates, leak emergencies, pool heaters and more.

Bathroom renovations

Real costs, timelines, layout changes, tapware, what goes wrong in older homes.

Burst pipes & emergencies

What to do at 3am, insurance claims, response times, proactive replacement.

Blocked drains

Recurring blockages, wipes, sewer camera surveys, pipe relining.

New builds

Pricing, compliance, pressure-limiting valves, owner-builder scope, timelines.

Acreage & hinterland

Rainwater tanks, septic vs AWTS, LPG bottle gas systems.

General

Pre-purchase inspections, water bills, finding a good plumber.

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