Rinnai Infinity B20 Natural Gas Continuous Flow Hot Water System
The Rinnai Infinity B20 Natural Gas Continuous Flow Hot Water System is available from Installed Today as a supply-only natural gas hot water unit or as a complete supply and install package in selected Brisbane and Gold Coast service areas, where available.
Choose the unit only if you already have a licensed gas fitter arranged, or check your supply and install package before checkout to confirm natural gas suitability, gas supply requirements, valve kit requirements, access, water pressure, electrical connection, outdoor location and available installation timeframes.
The Rinnai Infinity B20 Natural Gas is a compact external gas continuous flow hot water system designed for homes that want reliable on-demand hot water without a storage tank. With a 20 L/min flow rate at a 25°C rise, a 6.0 Star Equivalent Energy Rating and Puretemp™ temperature stability technology, it is a strong option for natural gas homes needing a practical replacement hot water unit.
About the Rinnai Infinity B20 Natural Gas
The Rinnai Infinity B20 Natural Gas heats water as it passes through the unit, instead of storing hot water in a tank. This makes it suitable for homes wanting a compact outdoor system that only heats water when a hot tap is used.
This model is designed for natural gas only. It is not interchangeable with LPG unless the correct LPG model is selected. The natural gas version is commonly suited to properties already connected to mains natural gas, subject to gas pipe sizing, meter capacity and licensed gas fitting checks.
The B20 is generally suited to 1 bathroom homes and may suit up to 2 bathrooms in warmer climates depending on water temperature, fixture flow rates, usage patterns and site conditions.
Buy Rinnai Infinity B20 Natural Gas Supply Only
Buy the Rinnai Infinity B20 Natural Gas supply only if you already have a licensed plumber and gas fitter arranged for installation.
The product price is for the unit only. Installation, valve kits, old system removal, disposal, gas fitting changes, electrical work, pipework changes, pressure control, recess boxes, pipe covers and compliance upgrades are not included unless selected separately as add-ons or part of an available install package.
Common search terms this product suits include:
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Rinnai Infinity B20 natural gas price
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20 L/min natural gas continuous flow hot water
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Rinnai Infinity B20 supply only
Rinnai Infinity B20 Natural Gas Supplied and Installed in Brisbane & Gold Coast
The Rinnai Infinity B20 Natural Gas can be ordered with a supply and install option in selected Brisbane and Gold Coast service areas, where available.
The installed-from price is based on the product plus the selected standard installation option. Final pricing can vary depending on site conditions and any selected add-ons.
Extra work or add-ons may be required for:
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Valve kit replacement
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Old system removal
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Disposal
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Natural gas pipe sizing changes
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Gas meter or supply suitability checks
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Electrical connection or power point requirements
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Pipework changes
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Recess box installation
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Pipe cover installation
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Restricted access
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Water pressure control
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Non-compliant existing installation
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Relocation from the existing hot water position
Rinnai Infinity B20 Natural Gas Installation in Brisbane
Installed Today can help Brisbane customers order the Rinnai Infinity B20 Natural Gas as either a supply-only unit or a supplied and installed package in selected service areas.
This model may suit Brisbane homes replacing an existing natural gas continuous flow hot water system, especially where the current unit is externally mounted and the property already has suitable mains natural gas available.
Before installation, the site should be checked for gas supply, pipe sizing, meter suitability, water pressure, electrical access, wall mounting position, clearances, drainage, existing valves and compliance requirements.
Rinnai Infinity B20 Natural Gas Installation in Gold Coast
Gold Coast homeowners, landlords, renovators and property managers can order the Rinnai Infinity B20 Natural Gas for supply only or supply and install where available.
This system may suit coastal homes, townhouses, investment properties and natural gas-connected homes needing a compact external hot water replacement. Final installation suitability depends on the existing gas setup, water pressure, wall space, service access and whether any additional parts or labour are required.
Is the Rinnai Infinity B20 Natural Gas Right for Your Home?
This system may suit you if:
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You need a natural gas continuous flow hot water system
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You are replacing an existing external natural gas hot water unit
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Your property is connected to mains natural gas
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You want a compact wall-mounted hot water system
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Your home has 1 bathroom, or possibly up to 2 bathrooms in warmer conditions
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You want a 20 L/min continuous flow unit
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You want a 6.0 Star Equivalent Energy Rating
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You want temperature stability technology for more consistent hot water delivery
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Your property has suitable gas supply, water pressure, access and outdoor wall space
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You want the choice of supply only or supply and install
Extra work may be required if:
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The existing unit is being moved to a new location
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Gas pipe sizing does not suit the new appliance
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The gas meter or supply needs checking
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Existing valves are old, missing or non-compliant
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Water pressure is outside the required range
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Electrical work is needed for the unit
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Pipework changes are required
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Access is restricted
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The old system needs removal or disposal
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The existing position does not meet clearance or compliance requirements
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The home needs a larger model due to bathrooms, fixtures or usage patterns
Key Features of the Rinnai Infinity B20 Natural Gas
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Natural gas continuous flow hot water system
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Product code: REU-BM2024W
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20 L/min flow rate at 25°C rise
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24 L/min flow rate at 20°C rise
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Suitable for 1 bathroom, and up to 2 bathrooms in warmer climates depending on conditions
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6.0 Star Equivalent Energy Rating
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Puretemp™ temperature stability technology
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Compact outdoor wall-mounted design
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Status operation monitor
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Compatible with optional Rinnai hot water controllers
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Compatible with selected pipe covers, recess boxes and security brackets
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Minimum operating water flow of 1.5 L/min
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Minimum water pressure of 160 kPa
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Maximum water pressure of 1000 kPa
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Natural gas rate of 20–156 MJ/h
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Hot, cold and gas connection sizes of 20 mm
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Approximate unit weight of 14 kg
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68 W electrical consumption
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Rinnai-listed 25 year extended heat exchanger warranty, subject to scheduled servicing and warranty terms
Quick Specs
Brand: Rinnai
Range: Infinity B
Product: Infinity B20 Natural Gas Continuous Flow Hot Water System
Product Code: REU-BM2024W
System Type: Gas continuous flow hot water
Gas Type: Natural Gas
Installation Type: External / outdoor installation
Recommended Household Size: Generally 1 bathroom, up to 2 bathrooms in warmer climates depending on conditions
Energy Rating: 6.0 Star Equivalent
Flow Rate at 25°C Rise: 20 L/min
Flow Rate at 20°C Rise: 24 L/min
Minimum Operating Water Flow: 1.5 L/min
Minimum Water Pressure: 160 kPa
Maximum Water Pressure: 1000 kPa
Gas Rate: 20–156 MJ/h natural gas
Electrical Consumption: 68 W
Factory Default Temperature: 50°C / 60°C depending on model setup
Status Monitor: Yes
Connection Sizes: 20 mm hot, 20 mm cold, 20 mm gas
Dimensions: 531 mm high x 351 mm wide x 202 mm deep including brackets
Height Including Brackets: 571 mm
Weight: 14 kg
Warranty: 25 year extended heat exchanger warranty listed by Rinnai, subject to scheduled servicing and warranty terms
Natural Gas Continuous Flow Hot Water
The Rinnai Infinity B20 Natural Gas is designed for properties connected to natural gas. It can be a practical option for homes replacing an older natural gas continuous flow unit or upgrading from a suitable existing external gas hot water system.
Because this is the natural gas model, it must be matched to a suitable natural gas supply. LPG and natural gas appliances are not interchangeable, so the correct gas type must be selected before ordering and installation.
Continuous Flow Performance
The B20 heats water on demand when a hot tap is opened. This means there is no storage tank and no stored hot water capacity to recover after use.
Its 20 L/min flow rate at a 25°C rise makes it a practical choice for many smaller to medium homes. Actual performance depends on incoming water temperature, selected outlet temperature, pipework, fixture flow rates, gas supply and whether multiple outlets are used at the same time.
Energy Rating
The Rinnai Infinity B20 Natural Gas has a 6.0 Star Equivalent Energy Rating. Continuous flow systems can be efficient because they heat water only when needed, avoiding the standby heat loss that occurs with many storage tank systems.
Running costs still depend on household usage, gas pricing, outlet temperature, water temperature, fixture flow rates and installation setup.
Puretemp™ Temperature Stability Technology
Puretemp™ temperature stability technology helps maintain steadier hot water temperature during normal operation. This is useful for households wanting more consistent hot water delivery from a compact natural gas continuous flow system.
Site conditions, fixture flow rates and correct installation still play an important role in overall hot water performance.
Compact Outdoor Design
The Rinnai Infinity B20 Natural Gas has a slim wall-mounted design, making it suitable for external installation where space is limited. It can be a strong replacement option when upgrading from an older external natural gas continuous flow unit.
The final position must comply with clearance, access, flueing, drainage, gas and plumbing requirements.
No Stored Tank
Because the B20 is a continuous flow system, it does not store hot water in a cylinder. This can free up space compared with a traditional storage tank and may suit homes wanting a more compact replacement.
There is no tank capacity to size, but the flow rate must suit the home’s hot water demand.
Optional Hot Water Controllers
The Rinnai Infinity B20 Natural Gas is compatible with optional Rinnai hot water controllers. Controllers can provide added convenience and temperature control where suitable.
Controllers are not included unless selected separately. Installation suitability and controller compatibility should be checked before purchase.
Outdoor Installation Only
This Rinnai Infinity B20 Natural Gas model is for external outdoor installation. Do not install this unit internally unless a manufacturer-approved internal or flued model is specifically selected for that purpose.
Outdoor installation must still meet clearance, ventilation, flue terminal, gas, plumbing and electrical requirements.
Water Pressure Requirements
The Rinnai Infinity B20 Natural Gas requires a minimum water pressure of 160 kPa and has a maximum listed water pressure of 1000 kPa.
If the property has high water pressure, pressure control may be required. If water pressure is too low, the unit may not operate correctly. Pressure should be checked as part of the installation assessment.
Gas Supply Requirements
The natural gas supply must be suitable for the appliance demand. The B20 has a natural gas rate range of 20–156 MJ/h.
A licensed gas fitter should confirm gas meter suitability, gas pipe sizing, appliance location and compliance requirements before installation.
Electrical Requirement
The Rinnai Infinity B20 Natural Gas requires power for operation and has a listed electrical consumption of 68 W.
Electrical access must be suitable for the installation location. Electrical work is not included unless selected or arranged separately.
Rinnai Infinity B16 vs B20 Natural Gas
The Rinnai Infinity B20 Natural Gas is a larger step up from the B16 Natural Gas and may suit homes needing more hot water flow capacity.
The B16 is generally better suited to smaller homes or lower hot water demand. The B20 provides a higher 20 L/min flow rate at a 25°C rise, making it a stronger option where the household wants more flow capacity while still using a compact external natural gas continuous flow system.
The right size depends on bathrooms, shower flow rates, incoming water temperature, number of users, gas supply and whether multiple outlets are used at once.
Rinnai Infinity B20 vs B26 Natural Gas
The Rinnai Infinity B20 Natural Gas suits many 1 bathroom homes and some warmer-climate homes with higher demand. The Rinnai Infinity B26 Natural Gas is the larger option for households needing more flow capacity, more simultaneous outlet use or stronger performance for larger homes.
If the home has multiple bathrooms, high-flow fixtures or frequent simultaneous hot water use, a larger model may be more suitable than the B20.
Common Uses
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Natural gas continuous flow hot water replacement
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External gas hot water system replacement
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1 bathroom homes
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Smaller to medium family homes
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Townhouses
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Rental properties
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Investment properties
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Renovation projects
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Homes connected to mains natural gas
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Supply-only orders where a licensed installer is already arranged
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Supply and install orders in selected Brisbane and Gold Coast areas
Suitability depends on household size, hot water usage, natural gas supply, water pressure, electrical access, installation location, plumbing condition, outlet flow rates, clearances and compliance requirements.
Why Order From Installed Today?
Installed Today makes it easier to order the Rinnai Infinity B20 Natural Gas as either a supply-only product or a supplied and installed package where available.
You can choose the unit only if you already have a licensed gas fitter arranged, or select an installation option in eligible Brisbane and Gold Coast service areas. Valve kits and installation add-ons can be selected online where required, helping you build a clearer product and installation pathway before checkout.
Benefits of ordering from Installed Today include:
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Supply-only or supply and install options
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Brisbane and Gold Coast service area support
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Installed-from pricing shown separately from the product price
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Compatibility checks before installation
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Product-specific information to help compare models
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Optional add-ons available where suitable
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Clear separation between unit price, installation and extras
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Suitable for customers with their own licensed installer
Frequently Asked Questions
Can I buy the Rinnai Infinity B20 Natural Gas supply only?
Yes. You can buy the Rinnai Infinity B20 Natural Gas as a supply-only unit if you already have a licensed plumber and gas fitter arranged.
Can I get the Rinnai Infinity B20 Natural Gas installed in Brisbane?
Yes, supply and install may be available in selected Brisbane service areas, depending on location, access, site conditions and installation availability.
Can I get the Rinnai Infinity B20 Natural Gas installed in Gold Coast?
Yes, supply and install may be available in selected Gold Coast service areas, subject to service coverage, site suitability and installation availability.
Is installation included in the product price?
No. The product price is for the unit only unless you select an installed option. Installation, valve kits, disposal, old system removal, electrical work, gas fitting changes and other extras are not included unless selected separately.
What gas type is this model?
This page is for the natural gas version of the Rinnai Infinity B20. Natural gas and LPG models are not interchangeable. Always select the correct gas type for your property.
Can the Rinnai Infinity B20 Natural Gas be installed indoors?
No. This model is for external outdoor installation. Internal installation should only be considered with a manufacturer-approved internal or flued model designed for that purpose.
What flow rate does the Rinnai Infinity B20 Natural Gas provide?
The Rinnai Infinity B20 Natural Gas provides 20 L/min at a 25°C rise and 24 L/min at a 20°C rise.
How many bathrooms does the Rinnai Infinity B20 Natural Gas suit?
It is generally suited to 1 bathroom and may suit up to 2 bathrooms in warmer climates depending on fixture flow rates, incoming water temperature, usage and site conditions.
What is the product code?
The listed product code is REU-BM2024W.
What are the water pressure requirements?
The listed minimum water pressure is 160 kPa and the maximum water pressure is 1000 kPa.
What is the minimum operating water flow?
The minimum operating water flow is 1.5 L/min.
What is the natural gas rate?
The listed natural gas rate is 20–156 MJ/h.
Does the Rinnai Infinity B20 Natural Gas need power?
Yes. The unit requires electrical power for operation and has a listed electrical consumption of 68 W.
What are the dimensions?
The listed dimensions are 531 mm high x 351 mm wide x 202 mm deep including brackets. The height including brackets is listed as 571 mm.
What does it weigh?
The listed unit weight is 14 kg.
What is the energy rating?
The Rinnai Infinity B20 Natural Gas has a 6.0 Star Equivalent Energy Rating.
Does it run out of hot water?
As a continuous flow system, it heats water on demand rather than relying on stored hot water. Ongoing hot water delivery depends on suitable gas supply, water flow, power, installation conditions and the unit being sized correctly for the home.
Can hot water controllers be added?
Optional Rinnai hot water controllers may be compatible. Controllers are not included unless selected separately.
Do I need a valve kit?
A valve kit may be required depending on the existing installation, local requirements and site condition. This should be checked before installation.
Is this a good replacement for an old natural gas hot water system?
Yes, it may be a suitable replacement for an old external natural gas continuous flow hot water system, provided the gas supply, water pressure, location, clearances and compliance requirements are suitable.
What is the warranty?
Rinnai lists a 25 year extended heat exchanger warranty for the Infinity B20, subject to scheduled servicing and warranty terms. Always check the current warranty conditions before purchase.