# Gas Hot Water Systems Perth | HWS Perth

> Perth gas hot water specialists. Continuous flow and storage gas systems on Rheem, Rinnai and Bosch, installed by licensed gas fitters. Free quotes, call today.

URL: https://perthhotwatersystem.com.au/gas-hot-water/

![Licensed gas fitter servicing a continuous flow gas hot water unit in Perth](/images/misc/licensed-gas-fitter-servicing-a-continuous-flow-ga.webp)

# Gas Hot Water Systems, Supply, Install & Repair in Perth

Last updated: 10 August 2026

Continuous flow and storage gas hot water, natural gas and LPG, installed and repaired by licensed gas fitters.

-   verified\_user Licensed & insured
-   schedule 24/7 Emergency Service
-   request\_quote Free upfront quotes
-   verified 100% Satisfaction Guarantee

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call 08 6243 6734

[tel:+61862436734 →](tel:+61862436734)

JOB TYPE

## Gas Hot Water

WA LICENSED verified PLUMBER & GAS

-   check\_circle Continuous flow and gas storage systems
-   check\_circle Natural gas and LPG connections
-   check\_circle Licensed gas fitting and compliance
-   check\_circle Rheem, Rinnai and Bosch brands

INDICATIVE

From $900

Book this service

[/contact/ →](/contact/)

star 4.9 (150+ Google reviews)

verified\_user Licensed & Insured

schedule 24/7 Emergency Service

task\_alt 1,000+ jobs completed

## Gas hot water, done by licensed gas fitters

We install, service and repair gas hot water right across Perth, both continuous flow (instantaneous) and traditional gas storage, on natural gas or LPG. Our licensed gas fitters handle sizing, flow rates and safe, compliant connections on leading brands including Rheem Stellar, Rinnai Infinity and Bosch Highflow.

Gas remains the default 

hot water system Perth

[/ →](/)

 homeowners choose, and for good reason. Where you already have a mains natural gas line, running costs are competitive, recovery is fast, and continuous flow units in particular deliver hot water indefinitely without a tank sitting there losing heat all day. What separates a good gas install from a mediocre one is not the brand on the box, it is whether the unit was sized on your actual demand and whether the gas line, flueing and clearances were done properly.

![Gas fitter checking the burner and electronic ignition inside an open gas hot water unit](/images/misc/licensed-gas-fitter-checking-the-burner-assembly-a.webp)

### Continuous flow versus gas storage

A continuous flow unit heats water as it passes through, so it never runs out and never wastes energy keeping a tank warm overnight. It mounts on a wall, takes up little space, and modern units use electronic ignition rather than a standing pilot. The catch is flow rate, measured in litres per minute. Run two showers and a kitchen tap off a 16 L/min unit and someone notices.

A gas storage system keeps a heated volume ready to go, so it copes better with short bursts of very high simultaneous demand, and it is cheaper upfront. The trade-off is standby loss: the cylinder radiates heat 24 hours a day whether you use the water or not, and once the stored volume runs out you wait for recovery.

We size continuous flow on simultaneous outlets rather than household headcount. As a rough guide, 16 L/min for a one-bathroom home, 20 L/min for a typical two-bathroom family home, and 26 L/min where multiple showers genuinely run at the same time. Perth’s winter inlet temperature also reduces achievable flow, which is why an undersized unit feels fine in February and disappointing in July.

### Common gas hot water problems we fix

**Pilot light will not stay lit.** The single most common gas hot water call we get. Usually a failing thermocouple, sometimes a dirty pilot orifice or a faulty gas control valve. We carry thermocouples on the truck.

**No hot water, unit not firing.** Could be gas supply, a faulty electronic ignition, a blocked burner, or on LPG simply an empty bottle. Diagnosis first, parts second.

**Water hot then cold, then hot again.** Classic on undersized continuous flow units, or where a tempering valve is failing. Sometimes it is a partially blocked burner reducing output.

**Storage tank leaking.** From the PTR valve or a fitting is usually repairable. From the base of the cylinder means the tank has corroded through and needs replacing.

**Insects in the burner compartment.** More common in Perth than people expect. A regular service clears it before it causes a lockout.

## What gas hot water costs in Perth

Installed gas systems generally run from around $900 for a basic gas storage replacement up to $4,500 for a high-flow or twin-unit continuous flow setup. Continuous flow costs more to install than storage because of the gas fitting, flueing and the upgraded gas line some older homes need.

If you are choosing between formats, our guide comparing 

continuous flow versus gas storage

[/guide/continuous-flow-vs-gas-storage-hot-water/ →](/guide/continuous-flow-vs-gas-storage-hot-water/)

 breaks it down properly, and 

natural gas versus LPG

[/guide/natural-gas-vs-lpg-hot-water/ →](/guide/natural-gas-vs-lpg-hot-water/)

 covers which suits your property. For a whole-of-market view, see 

how to choose the right hot water system

[/guide/how-to-choose-the-right-hot-water-system/ →](/guide/how-to-choose-the-right-hot-water-system/)

, and if your pilot keeps dropping out, start with 

why a gas pilot light keeps going out

[/guide/gas-hot-water-pilot-light-going-out/ →](/guide/gas-hot-water-pilot-light-going-out/)

.

## What's included

-   check\_circle Continuous flow and gas storage systems
-   check\_circle Natural gas and LPG connections
-   check\_circle Licensed gas fitting and compliance
-   check\_circle Rheem, Rinnai and Bosch brands
-   check\_circle Flow-rate and sizing guidance

Transparent pricing

## How much does gas hot water cost in Perth?

Continuous flow units cost more to install than storage because of gas fitting, flueing and sometimes an upgraded gas line.

### Gas storage

Traditional tank, natural gas or LPG

$900 - $2,200 per system installed

-   check\_circle 135L to 170L common sizes
-   check\_circle Rheem and Vulcan models
-   check\_circle Suits high simultaneous demand
-   check\_circle Lower upfront cost

Get a Free Quote

[/contact/ →](/contact/)

Most common

### Continuous flow

Endless hot water, no standby losses

$1,400 - $3,200 per system installed

-   check\_circle 16 to 26 L/min flow rates
-   check\_circle Rinnai Infinity and Bosch
-   check\_circle Wall mounted, saves space
-   check\_circle Temperature controllers optional

Get a Free Quote

[/contact/ →](/contact/)

### Premium & multi-unit

High flow rate or twin-unit setups

$3,200 - $4,500 per system installed

-   check\_circle 26 L/min and above
-   check\_circle Twin-unit manifold options
-   check\_circle Large-home multi-bathroom fit
-   check\_circle Full compliance certification

Get a Free Quote

[/contact/ →](/contact/)

Prices are indicative only. Every job is quoted upfront and in writing after we check your site, so there are no surprises. Low-interest financing is available on larger upgrades.

Why us

## Why choose Hot Water System Perth for gas hot water?

verified\_user

### Licensed gas fitters

Gas work is not general plumbing. Every connection, flue and pressure test is done by a licensed WA gas fitter, and certified.

engineering

### Flow rate done properly

A 16 L/min unit in a two-bathroom home means the shower drops when the kitchen tap runs. We size on real simultaneous demand.

bolt

### Natural gas and LPG

Mains gas homes and LPG properties both covered, including bayonet connections and bottle changeover setups.

handshake

### Rheem, Rinnai and Bosch

The three brands that dominate Australian gas hot water, all serviced, repaired and installed by us.

local\_shipping

### Pilot and thermocouple repairs

The most common gas hot water fault is a pilot that will not stay lit. We carry thermocouples and gas control valves on the truck.

savings

### Honest running-cost advice

Gas is not automatically cheapest. Where a heat pump would save you more over the system's life, we will say so.

Process

## How our gas hot water works

01 search

### Check your gas supply

We confirm whether you are on mains natural gas or bottled LPG, check the gas bayonet or meter, and whether the existing line will carry the new unit.

02 request\_quote

### Size on flow rate

Continuous flow units are sized in litres per minute, not litres of storage. We work out your simultaneous-outlet demand before recommending a model.

03 build

### Install and flue

A licensed gas fitter mounts the unit, makes the gas and water connections, sets clearances and flueing, and pressure-tests the line.

04 task\_alt

### Commission and certify

We fire it up, set the delivery temperature at the tempering valve, check combustion and hand over the compliance certificate.

## Need gas hot water in Perth?

Free written quote, licensed plumbers, 24/7 for emergencies, backed by our 100% satisfaction guarantee.

call 08 6243 6734

[tel:+61862436734 →](tel:+61862436734)

 

Get a Free Quote

[/contact/ →](/contact/)

Our work

## Gas Hot Water jobs around Perth

Real jobs from around the metro. Click any image to enlarge.

 

 

Results

## See the difference

![Before: Gas Hot Water transformation](/images/features/old-bulky-gas-storage-tank-taking-up-the-side-path.webp) Before

![After: Gas Hot Water transformation](/images/features/compact-wall-mounted-continuous-flow-gas-unit-in-t.webp) After

Gas Hot Water transformation

## How Hot Water System Perth compares

| Feature | Typical provider | HWS Perth |
| --- | --- | --- |
| Gas licensing | Subcontracted gas fitter | Licensed gas fitters in-house |
| Sizing method | Match the old unit | Calculated on simultaneous flow demand |
| LPG properties | Mains gas only | Natural gas and LPG both covered |
| Pilot light faults | Return visit for parts | Thermocouples carried on the truck |
| Compliance certificate | On request | Issued on every gas install |

Reviews

## What customers say about our gas hot water

Rated 4.9 from 150+ Google reviews across the Perth metro.

starstarstarstarstar

> "Replaced our old gas storage tank with a continuous flow unit and freed up the whole side path. They sized it for two bathrooms so the shower doesn't drop when the dishwasher runs."

Angela R. Morley

starstarstarstarstar

> "Pilot light kept dropping out for months. Two other plumbers relit it and left. These guys replaced the thermocouple and it's been perfect since."

Peter L. Kewdale

starstarstarstarstar

> "We're on bottled gas out past Ellenbrook and most places wouldn't touch it. No issue for them, sorted the bayonet and the unit in one visit."

Hannah B. Ellenbrook

Got questions?

## Gas Hot Water FAQs

### Is continuous flow better than gas storage?

expand\_more

For most Perth households, yes. Continuous flow gives endless hot water, avoids standby heat losses, and frees up the floor space a tank takes. Gas storage still wins where several outlets run heavy demand at exactly the same time, since a tank delivers its full stored volume at once.

### Does continuous flow gas hot water ever run out?

expand\_more

It does not run out in the sense a tank does, because it heats on demand. What limits it is flow rate. A 16 litre-per-minute unit can struggle with two showers plus a tap, which is why we size on simultaneous outlets rather than on household size alone.

### Which gas hot water system is cheaper to run?

expand\_more

Continuous flow is usually cheaper for typical households because it never reheats stored water you are not using. A gas storage tank loses heat through the cylinder walls around the clock, which is money burnt whether you shower or not.

### Can I convert an LPG unit to natural gas?

expand\_more

Some units can be converted by a licensed gas fitter using a manufacturer conversion kit that changes the injectors and adjusts the gas pressure. Others cannot and need replacing. We check the model before quoting either way. Never attempt this yourself, it is licensed work for good reason.

### How do I know if I have natural gas or LPG?

expand\_more

If you have gas bottles at the side of the house, you are on LPG. If you have a gas meter connected to a street main, you are on natural gas. Newer estates on Perth's fringe are sometimes LPG-only. We can confirm it on site in seconds.

### Why does my gas hot water pilot light keep going out?

expand\_more

Most often a failing thermocouple. It is the small sensor that tells the gas valve the pilot is lit, and when it weakens the valve shuts the gas off as a safety measure. A dirty pilot orifice or a faulty gas control valve can also cause it. Relight it once by the manufacturer's instructions, and if it drops again, call a gas fitter.

### What size continuous flow unit do I need?

expand\_more

As a rough guide, 16 L/min suits a small home with one bathroom, 20 L/min suits a typical family home with two bathrooms, and 26 L/min suits larger homes where multiple showers run at once. Perth's cold-water inlet temperature in winter also affects achievable flow, which we factor in.

### Do gas hot water systems need servicing?

expand\_more

Yes. An annual or biennial service checks the burner, ignition, gas pressure, flue and tempering valve, and clears any dust or insect blockage from the burner compartment. It is also when we test the PTR valve on a storage unit, which is the safety device that stops pressure building dangerously.

### Can you install a gas hot water unit where there was an electric one?

expand\_more

Usually, provided you have a gas supply within reasonable reach and the location meets clearance and flueing requirements. It means new gas pipework and often a different mounting position, both of which we cost in the quote before you commit.

### Do you install Rinnai and Rheem gas systems?

expand\_more

Yes, along with Bosch and Vulcan. Rinnai Infinity and Rheem Stellar are the two ranges we install most often in Perth, and we service and repair all of them regardless of who installed the unit originally.

### Still have a question?

Talk to a licensed Perth plumber. No call-out surprises, no obligation.

Get a Free Quote

[/contact/ →](/contact/)

 

Call 08 6243 6734

[tel:+61862436734 →](tel:+61862436734)

## Related guides

Detailed answers to the questions we get asked most about gas hot water.

Explainer

### Continuous Flow vs Gas Storage Hot Water for Perth Homes

Endless hot water or a gas storage tank? Compare running cost, space and peak demand to pick the right gas hot water system for your Perth home.

[Continuous Flow vs Gas Storage Hot Water for Perth Homes →](/guide/continuous-flow-vs-gas-storage-hot-water/)

Explainer

### Gas Pilot Light Keeps Going Out: Causes and Fixes

A gas hot water pilot light that will not stay lit is usually a failing thermocouple or gas valve. Safe relight steps, the likely causes, and when to call a gas fitter.

[Gas Pilot Light Keeps Going Out: Causes and Fixes →](/guide/gas-hot-water-pilot-light-going-out/)

Decision guide

### Natural Gas vs LPG Hot Water: Which Fits Your Property?

Mains natural gas or bottled LPG for hot water? Compare availability across Perth, running costs and connection requirements to pick the right setup.

[Natural Gas vs LPG Hot Water: Which Fits Your Property? →](/guide/natural-gas-vs-lpg-hot-water/)

## Related services

![Licensed Perth plumber installing a new hot water system on the exterior wall of a suburban home](/images/misc/licensed-perth-plumber-mounting-a-brand-new-hot-wa.webp)

### Hot Water System Installation

Supply and compliant installation of new hot water systems, sized right, installed to WA code, with free old-tank removal.

[Hot Water System Installation →](/hot-water-system-installation/)

![Perth plumber servicing an electric storage hot water tank with the element access panel open](/images/misc/perth-plumber-working-on-an-electric-storage-hot-w.webp)

### Electric Hot Water Systems

Instantaneous and storage electric hot water, single and dual element, off-peak ready, installed and repaired across Perth.

[Electric Hot Water Systems →](/electric-hot-water/)

![Solar hot water collectors and tank mounted on the tiled roof of a Perth home](/images/misc/solar-hot-water-collectors-and-tank-mounted-on-a-t.webp)

### Solar Hot Water Systems

Roof-mounted and split solar hot water with gas or electric boosting, STC-eligible, ideal for Perth's climate.

[Solar Hot Water Systems →](/solar-hot-water/)

![](/images/hero/licensed-perth-plumber-in-work-polo-finishing-a-ho.webp)

24/7 emergency call-outs available

## Ready to book gas hot water?

Continuous flow and storage gas hot water, natural gas and LPG, installed and repaired by licensed gas fitters. Free upfront quote, no obligation.

Get a Free Quote

[/contact/ →](/contact/)

 

call 08 6243 6734

[tel:+61862436734 →](tel:+61862436734)

-   check\_circle Fully licensed & insured plumbing and gas professionals
-   check\_circle All major Australian & German brands serviced
-   check\_circle 100% customer satisfaction guarantee on all work