What Is Instant Gas Hot Water
Instant gas hot water systems heat water only when required which delivers endless hot water without the need for storing it in a tank. Simply Hot Water Perth supplies continuous flow systems with strong energy efficiency, stable temperature control and compact wall mounted designs that suit most Perth homes.
Why Instant Gas Hot Water Is Popular in WA
• Hot water on demand
• Lower running costs
• Ideal for multi bathroom homes
• Space saving installation
• Long lasting and efficient
• Consistent hot water during peak use
Browse Our Continous Flow Gas Hot Water Systems
Onsen 26L 50°C Maximum
$1,695 inc GST-Supply & Install
$853 inc GST-Trade Only
*Allow $540 for a 10Amp external GPO if required
- The Price includes Supply & Installation of the water heater
- Onsen 26L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 50oC preset models have been preset to deliver water at a maximum of 50 degrees celsius.
- Models are available to suit either natural gas or LPG.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
- Recess boxes are available to keep everything neat and tidy.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
Onsen 26 L 60°C Maximum
$1,795 inc GST-Supply & Install
$925 inc GST-Trade Only
Electrical allowance $540 includes 10amp GPO within 1 Mtr of the existing water heater if required.
- The Price includes Supply & Installation of the water heater, as per the terms & conditions of sale, as detailed at the Checkout.
- Add to Cart
- Onsen 26L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 60oC preset models have been preset to 60oC however with the included controller you have the option to adjust the temperature to how you like it, where you like it.
- This high capacity unit is only suitable for homes with natural gas.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
Onsen 30 L 60°C Maximum
$1,895 inc GST-Supply & Install
$1,005 inc GST-Trade Only
Electrical allowance $540 includes 10amp GPO within 1 Mtr of the existing water heater if required.
- The Price includes Supply & Installation of the water heater.
- Onsen 30L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 60oC preset models have been preset to 60oC however with the included controller you have the option to adjust the temperature to how you like it, where you like it.
- This high capacity unit is only suitable for homes with natural gas.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
Rinnai B16 50°C Maximum
$1,790 inc GST-Supply & Install
Electrical allowance $540 includes 10amp GPO within 1 Mtr of the existing water heater if required.
- The Price includes Supply & Installation of the water heater, as per the terms & conditions of sale, as detailed at the Checkout.
- Add to Cart
- Rinnai 16L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 50oC preset models have been preset to deliver water at a maximum of 50 degrees celsius.
- Models are available to suit either natural gas or LPG.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
Rinnai B20 50°C Maximum
$1,875 inc GST-Supply & Install
Electrical allowance $540 includes 10amp GPO within 1 Mtr of the existing water heater if required.
- The Price includes Supply & Installation of the water heater.
- Rinnai 20L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 50oC preset models have been preset to deliver water at a maximum of 50 degrees celsius.
- Models are available to suit either natural gas or LPG.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
Rinnai B26 50°C Maximum
$1,925 inc GST-Supply & Install
Electrical allowance $540 includes 10amp GPO within 1 Mtr of the existing water heater if required.
- The Price includes Supply & Installation of the water heater.
- Rinnai 26L continuous flow gas hot water system is designed to deliver endless supply of hot water to your home.
- 50oC preset models have been preset to deliver water at a maximum of 50 degrees celsius.
- Models are available to suit either natural gas or LPG.
- The advantages of a continuous flow gas hot water systems is that energy is only consumed when you turn on your hot water and not lost from storing the hot water.
- The unit sits neatly outdoors, ready to keep you and your family warm, quickly and efficiently with its 6 star energy rating.
10 Year Warranty - 6 Star Energy Rating - LPG or Natural Gas
*Available in Natural Gas and LPG and is a non pre set product. If you do not have a tempering valve local regulations may require you to have one installed.
Bosch HydroPower Series
10H Series
Continuous hot water without electricity or batteries
The Bosch HydroPower series delivers consistent hot water to Australian homes with no need for electrical connections or battery replacements. Built for convenience and energy efficiency, the HydroPower models use water flow to ignite the burner, offering a reliable, environmentally conscious solution for everyday use.
- No electrical connection or batteries required
- Available in 10L, 13L, and 16L models for external installation
- Energy efficiency up to 5.3-star rating
- Suitable for natural gas and LPG systems
- Built to last with over 30 years of proven performance
Classic ignition, dependable results
Using a traditional standing pilot light, these models offer tried-and-true hot water delivery in all seasons — with minimal servicing required.
Flexible installation
Compact design allows for straightforward outdoor wall mounting, keeping installation hassle-free for both homeowners and installers.
Efficient water flow
The continuous flow system ensures hot water is always available when you need it — without storing and reheating water.
Long-term durability
Built for Australian conditions with robust materials, Bosch Pilot systems are ideal for both urban and rural households seeking straightforward performance.
Bosch quality, built to last
Backed by decades of experience and advanced German engineering, every Bosch HydroPower unit is designed and built to the highest standards. Our commitment to quality means you can expect reliable performance without compromise — every time you turn on the tap.
Bosch P Series 10L & 16L
Pilot Ignition Gas Hot Water System
Simple, reliable hot water with standing pilot ignition
The Bosch Pilot range is built for those who value simplicity and proven technology. With a standing pilot light for ignition and continuous flow heating, these external systems provide steady and consistent hot water without the need for electronics or batteries.
- Reliable pilot ignition system
- Available in 10L and 16L external models
- Energy efficiency up to 4.6 stars
- No electricity or battery required
- Compact, durable outdoor design
Flexible installation
Compact design allows for straightforward outdoor wall mounting, keeping installation hassle-free for both homeowners and installers.
Efficient water flow
The continuous flow system ensures hot water is always available when you need it — without storing and reheating water.
Long-term durability
Built for Australian conditions with robust materials, Bosch Pilot systems are ideal for both urban and rural households seeking straightforward performance.
Bosch quality, built to last
Backed by decades of experience and advanced German engineering, every Bosch HydroPower unit is designed and built to the highest standards. Our commitment to quality means you can expect reliable performance without compromise — every time you turn on the tap.
Infinity B20
- Ideal for 1 bathroom (up to 2 in warmer climates)
- Never runs out of hot water
- Precise temperature control for safety and convenience
- 6.0 Star equivalent energy rating*
- Status operation monitor
- Puretemp™ temperature stability technology**
- LPG or Natural Gas models available
25 year extended heat exchanger warranty***
6.0 Star equivalent energy rating*
- Low running costs
- Highly efficient
- Low greenhouse gas emissions
Superior technology
- Quality Japanese design and manufacturing
- Precise temperature control for safety and convenience
- Compact design allows installation flexibility
- Suitable for higher ambient water temperatures
- Compatible with low flow rated shower fixtures
- High-capacity hot water for growing households
- Looking for a reliable, energy-smart hot water solution? The Infinity B20 Gas Continuous Flow Hot Water Heater is perfect for single-bathroom homes and even suitable for two bathrooms in warmer areas.
- This continuous flow gas system heats water only as needed, meaning you’ll enjoy the comfort of endless hot water - without the high energy bills. With a superior 6 Star energy rating*, this 20L system offers powerful performance while keeping efficiency front and centre.
- Crafted to endure harsh Australian weather conditions, the Infinity B20 combines performance with practicality through features like slim, modern design that fits almost anywhere, user-friendly temperature display for easy adjustments and Puretemp™ stability control for consistent water temperature.**
- Covered by Rinnai’s 25 year heat exchanger warranty***, the Infinity B20 is built for longevity and peace of mind.
B26 Black
Australia’s favourite continuous flow system — now in black
Unparalleled in performance, the Rinnai's B26 is Australia’s favourite Gas Continuous Flow Hot Water Heater for 1–2 bathroom homes (1–3 in warmer climates).
Now available in a bold black finish or classic dune, the B26 delivers superior comfort and reduced running costs, with no energy consumed until a tap is turned on. With an impressive 6 star energy rating, it’s the most energy efficient 26L continuous flow system on the market.
Built to withstand tough Australian conditions, the slimline design also saves valuable outdoor space.
Reliability of the Builders B26 with a modern black finish
Quality Japanese design and manufacturing
Never runs out of hot water
Precise temperature control for safety and convenience
Puretemp™ temperature stability technology
Natural Gas models available
25 year extended heat exchanger warranty*
6.1 Star Equivalent Energy Rating**
- Low running costs
- Highly efficient
- Low greenhouse gas emissions
Superior Technology
- Precise temperature control for safety and convenience
- Puretemp™ temperature stability technology***
- Compact design allows installation flexibility
- Suitable for higher ambient water temperatures
- Compatible with low flow rated shower fixtures (3 Star - 7.0 to 9.0 l/min)
Our Instant Gas Hot Water Services
Instant Gas Hot Water Installation
This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.
Continuous Flow Upgrades
This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.
Maintenance and Servicing
This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.
Benefits of Continuous Flow Gas Hot Water
• Endless hot water
• Lower energy consumption
• Compact wall mounted design
• Strong temperature stability
• Durable and long lasting
• Suitable for small and large properties
Why Choose Simply Hot Water Perth
• Specialists in instant gas hot water systems
• Fast response across Perth
• Experienced and licensed technicians
• Clear upfront pricing
• Quality systems designed for WA conditions
• Reliable service with strong customer satisfaction
Need Instant Continuous FlowGas Hot Water?
Call (08) 6374 5892 or email sales@simplyhotwaterperth.com.au for a fast, obligation free quote. Our team will recommend the right instant gas hot water system for your home.
FAQs About Instant Continuous Flow Gas Hot Water Systems in Perth
How does an instant gas hot water system work
It heats water as it flows through the unit which provides constant hot water without a storage tank.
Is instant gas hot water cheaper to run
Yes. It only heats water when used which helps reduce energy consumption.
How long does installation take
Most installations are completed within a few hours depending on your home setup.
Can I replace an electric system with instant gas hot water
Yes. Many Perth homes upgrade from electric storage to continuous flow gas for better efficiency and reliability.
What size instant gas system do I need
System size depends on the number of bathrooms and your hot water demand. We assess this during the quoting process.
Do instant gas systems work in winter
Yes. Modern systems maintain strong temperature control even during cold mornings.
How long do instant gas systems last?
Most units last between 12 and 20 years with regular maintenance.
Do instant gas systems require servicing
Annual servicing is recommended to maintain performance, safety and efficiency.
Are instant gas hot water systems safe
Yes. Licensed installation and routine servicing ensure compliant and safe operation.
How do I get a quote
Call (08) 6374 5892 or email sales@simplyhotwaterperth.com.au to request a quote.