Rinnai Infinity B20 LPG Continuous Flow Hot Water System

The Rinnai Infinity B20 LPG Continuous Flow Hot Water System is available from Installed Today as a supply-only LPG 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 LPG suitability, gas supply requirements, valve kit requirements, access, water pressure, electrical connection, outdoor location and available installation timeframes.

The Rinnai Infinity B20 LPG is a compact external gas continuous flow hot water system designed for homes that want efficient 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 LPG properties needing a reliable replacement hot water unit.

About the Rinnai Infinity B20 LPG

The Rinnai Infinity B20 LPG 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 LPG only. It is not interchangeable with natural gas unless the correct natural gas model is selected. The LPG version is commonly suited to properties using bottled LPG or existing LPG gas infrastructure, subject to gas supply sizing, regulator suitability 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 LPG Supply Only

Buy the Rinnai Infinity B20 LPG 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:

• Rinnai Infinity B20 LPG price

• Rinnai B20 LPG hot water system

• Rinnai REU-BM2024W LPG

• 20 L/min LPG continuous flow hot water

• LPG instant gas hot water system

• Outdoor LPG hot water system

• Rinnai Infinity B20 supply only

Rinnai Infinity B20 LPG Supplied and Installed in Brisbane & Gold Coast

The Rinnai Infinity B20 LPG 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:

• Valve kit replacement

• Old system removal

• Disposal

• LPG regulator or gas supply changes

• Gas pipe sizing upgrades

• Electrical connection or power point requirements

• Pipework changes

• Recess box installation

• Pipe cover installation

• Restricted access

• Water pressure control

• Non-compliant existing installation

• Relocation from the existing hot water position

Rinnai Infinity B20 LPG Installation in Brisbane

Installed Today can help Brisbane customers order the Rinnai Infinity B20 LPG 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 LPG continuous flow hot water system, especially where the current unit is externally mounted and the property already has suitable LPG supply available.

Before installation, the site should be checked for gas supply, water pressure, electrical access, wall mounting position, clearances, drainage, existing valves and compliance requirements.

Rinnai Infinity B20 LPG Installation in Gold Coast

Gold Coast homeowners, landlords, renovators and property managers can order the Rinnai Infinity B20 LPG for supply only or supply and install where available.

This system may suit coastal homes, townhouses, investment properties and LPG-connected homes needing a compact external hot water replacement. The final installation suitability depends on the existing LPG setup, water pressure, wall space, service access and whether any additional parts or labour are required.

Is the Rinnai Infinity B20 LPG Right for Your Home?

This system may suit you if:

• You need an LPG continuous flow hot water system

• You are replacing an existing external LPG hot water unit

• You want a compact wall-mounted hot water system

• Your home has 1 bathroom, or possibly up to 2 bathrooms in warmer conditions

• You want a 20 L/min continuous flow unit

• You want a system with a 6.0 Star Equivalent Energy Rating

• You want temperature stability technology for more consistent hot water delivery

• Your property has suitable LPG supply, water pressure, access and outdoor wall space

• You want the choice of supply only or supply and install

Extra work may be required if:

• The existing unit is being moved to a new location

• Gas pipe sizing does not suit the new appliance

• The LPG regulator or bottle setup needs changes

• Existing valves are old, missing or non-compliant

• Water pressure is outside the required range

• Electrical work is needed for the unit

• Pipework changes are required

• Access is restricted

• The old system needs removal or disposal

• The existing position does not meet clearance or compliance requirements

• The home needs a larger model due to bathrooms, fixtures or usage patterns

Key Features of the Rinnai Infinity B20 LPG

• LPG continuous flow gas hot water system

• Product code: REU-BM2024W

• 20 L/min flow rate at 25°C rise

• 24 L/min flow rate at 20°C rise

• Suitable for 1 bathroom, and up to 2 bathrooms in warmer climates depending on conditions

• 6.0 Star Equivalent Energy Rating

• Puretemp™ temperature stability technology

• Compact outdoor wall-mounted design

• Status operation monitor

• Compatible with optional Rinnai hot water controllers

• Compatible with selected pipe covers, recess boxes and security brackets

• Minimum operating water flow of 1.5 L/min

• Minimum water pressure of 160 kPa

• Maximum water pressure of 1000 kPa

• LPG gas rate of 20–156 MJ/h

• Hot, cold and gas connection sizes of 20 mm

• Approximate unit weight of 14 kg

• 68 W electrical consumption

• 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 LPG Continuous Flow Hot Water System
Product Code: REU-BM2024W
System Type: Gas continuous flow hot water
Gas Type: LPG
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 LPG
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

LPG Continuous Flow Hot Water

The Rinnai Infinity B20 LPG is designed for properties using LPG gas. LPG systems are common in homes without natural gas connection, rural properties, acreage homes, granny flats, secondary dwellings and locations using bottled gas supply.

Because this is the LPG model, it must be matched to a suitable LPG supply. Gas type must be checked before ordering and installation. A natural gas model should not be substituted for LPG unless the correct appliance type is selected.

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 LPG 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 LPG 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 LPG 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 LPG 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 LPG 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 LPG 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 LPG 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 LPG gas supply must be suitable for the appliance demand. The B20 has an LPG gas rate range of 20–156 MJ/h.

A licensed gas fitter should confirm LPG bottle setup, regulator suitability, gas pipe sizing, appliance location and compliance requirements before installation.

Electrical Requirement

The Rinnai Infinity B20 LPG 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 LPG

The Rinnai Infinity B20 LPG is a larger step up from the B16 LPG 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 LPG continuous flow system.

The right size depends on bathrooms, shower flow rates, incoming water temperature, number of users, LPG supply and whether multiple outlets are used at once.

Rinnai Infinity B20 vs B26 LPG

The Rinnai Infinity B20 LPG suits many 1 bathroom homes and some warmer-climate homes with higher demand. The Rinnai Infinity B26 LPG 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

• LPG continuous flow hot water replacement

• External gas hot water system replacement

• 1 bathroom homes

• Smaller to medium family homes

• Townhouses

• Granny flats

• Rental properties

• Investment properties

• Renovation projects

• Homes using bottled LPG

• Supply-only orders where a licensed installer is already arranged

• Supply and install orders in selected Brisbane and Gold Coast areas

Suitability depends on household size, hot water usage, LPG 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 LPG 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:

• Supply-only or supply and install options

• Brisbane and Gold Coast service area support

• Installed-from pricing shown separately from the product price

• Compatibility checks before installation

• Product-specific information to help compare models

• Optional add-ons available where suitable

• Clear separation between unit price, installation and extras

• Suitable for customers with their own licensed installer

Frequently Asked Questions

Can I buy the Rinnai Infinity B20 LPG supply only?

Yes. You can buy the Rinnai Infinity B20 LPG as a supply-only unit if you already have a licensed plumber and gas fitter arranged.

Can I get the Rinnai Infinity B20 LPG 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 LPG 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 LPG version of the Rinnai Infinity B20. LPG and natural gas models are not interchangeable. Always select the correct gas type for your property.

Can the Rinnai Infinity B20 LPG 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 LPG provide?

The Rinnai Infinity B20 LPG 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 LPG 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 LPG gas rate?

The listed LPG gas rate is 20–156 MJ/h.

Does the Rinnai Infinity B20 LPG 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 LPG 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 LPG hot water system?

Yes, it may be a suitable replacement for an old external LPG 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.

Tempering Valve and Element Information

*Element size information:
All electric hot water units are supplied as standard with a 3.6kW element unless otherwise stated on the product page, invoice, or order confirmation.

If a different element configuration is requested, such as 1.8kW or 2.4kW, the hot water unit may still arrive with the standard 3.6kW element fitted from the manufacturer. The requested 1.8kW or 2.4kW element will be supplied separately with the order for installation by a suitably licensed electrical contractor or licensed electrical licence holder.

Any element changeover, electrical connection, disconnection, wiring, testing, or modification must be carried out by a licensed electrical contractor or licensed electrical licence holder. Elements must not be changed, connected, modified, or tested by an unlicensed person.

Alternative elements supplied for non-standard configurations may be generic replacement elements and may not be the same brand as the hot water unit unless specifically stated. Generic elements are supplied to suit the requested element size and electrical configuration, but final suitability must be checked by the licensed installer before installation.

1.8kW and 2.4kW elements supplied separately with a hot water unit include a 12-month supply-only parts warranty from the date of purchase, provided the element has been correctly installed by a licensed electrical contractor or licensed electrical licence holder and used under normal operating conditions.

This element warranty covers the replacement supply of the element only. It does not include labour, call-out fees, electrical work, plumbing work, fault finding, removal, reinstallation, testing, travel, downtime, damage caused by incorrect installation, or any other associated costs. Warranty may be declined where the element has been incorrectly installed, dry-fired, modified, damaged, connected to incorrect voltage or wiring, affected by power issues, used in unsuitable water conditions, or installed by an unlicensed person.

Proof of purchase, installer details, electrical licence details, photos, and/or return of the faulty element may be required before a warranty claim is approved.

**Tempering valve information:
Where a hot water system is capable of delivering water above 50°C, a compliant tempering valve must be installed to control the temperature delivered to personal hygiene fixtures such as showers, baths, basins, and bathroom outlets. This helps reduce the risk of scalding and assists with meeting plumbing compliance requirements.

A tempering valve blends hot and cold water to deliver a safer controlled outlet temperature to required fixtures. The hot water unit itself may store water at a higher temperature, but the water delivered to personal hygiene outlets must be controlled where required by plumbing regulations.

If your property already has a suitable, compliant tempering valve installed, your licensed plumber can assess whether it is appropriate for use with the new hot water system. Existing valves may not always be suitable due to age, condition, compliance requirements, valve type, location, or system compatibility.

If a compliant tempering valve is not already installed, or if the existing valve is unsuitable, one must be supplied and installed by a licensed plumber as part of the hot water installation.

Tempering valves are not automatically included with every supply-only hot water unit unless specifically selected, listed as included, or purchased as part of a suitable valve kit. If a tempering valve is required, please purchase the appropriate valve kit with your order or arrange for your licensed installer to supply and install the correct tempering valve on site.

It is the customer’s responsibility to ensure the installation is completed by appropriately licensed trades and that all required valves, fittings, electrical work, plumbing work, and compliance requirements are allowed for as part of the installation.

Optional Installation, Organised for You

Want the product supplied and the installation organised in one simple order? On eligible products and in selected service areas, Installed Today can arrange installation through a licensed installation partner at clear, upfront install rates.

You pay Installed Today for the selected product and install package, and we pay the assigned contractor on your behalf. That means one checkout, one package summary, and a smoother process from order to installation.

Why Choose an Installed Today Install Package?

Clear upfront install pricing
Our install package builder shows the available install option and selected add-ons before checkout, so you can review the package total before placing your order.

We organise the installation
Once your order is placed, we help coordinate the installation with a licensed installation partner in your area.

No need to pay the contractor separately for the selected package
You pay Installed Today for the product and selected install package. We then pay the assigned contractor on your behalf for the included installation service.

Built for common replacement jobs
The process is designed for suitable like-for-like replacement installs where the existing setup, access and compliance requirements match the selected package.

Add-ons shown before checkout where possible
If your answers indicate that a valve kit, access add-on or other selected extra may be required, these are shown in the package before you add it to cart.

How It Works

Step 1: Choose your product
Select the hot water system you want to order, including the right size, model and kW rating where applicable.

Step 2: Build your optional install package
Answer a few quick questions about your existing system, location, access and setup.

Step 3: Review your package total
Your selected product, installation option and any selected add-ons are shown before checkout.

Step 4: Pay once through Installed Today
Complete your order online. Your payment covers the product and the selected install package shown in your cart.

Step 5: We coordinate the install
Where the job is suitable and installation is available, we assign a licensed installation partner and help organise the next steps.

Important Installation Notes

Installed Today supplies the product and helps arrange installation through licensed installation partners where available. Installation is only available on selected products and in eligible service areas.

The install package price applies to the selected installation scope shown at checkout. Final suitability still depends on site access, existing plumbing or electrical setup, valves, drainage, compliance requirements, product suitability and any extra work required.

If something outside the selected package is needed, it will be discussed before proceeding.

Supply-only orders do not include installation, old unit removal, disposal, valve kits, electrical work, plumbing alterations or compliance upgrades unless these are clearly selected or included in your order.

A Simpler Way to Buy Hot Water, Filters, Pumps and Plumbing Products

Buying a new hot water system, water filter, pump or plumbing product should be clear, simple and easy to organise.

Installed Today helps you compare products, check supply-only pricing and, where available, build an optional installation package before checkout. That means you can choose the product, review the available options and order with more confidence, without the usual back and forth just to understand the starting price.

Whether you already know exactly what you need or you are still comparing options, Installed Today gives you a clearer way to buy the right product for your home, budget and timing.

Why Customers Choose Installed Today

Supply Only or Optional Installation

Choose the product on its own, or add installation where available on selected products and in eligible service areas. This gives you the flexibility to order the way that suits you best.

Clear Pricing Before Checkout

See the product price upfront, then review available installation options and common add-ons before placing your order. You can check the package total before checkout, instead of waiting on basic pricing just to get started.

Product Details That Actually Help

Key specs, sizing details, warranty information, product features and suitability notes are shown clearly, making it easier to compare products properly before you buy.

Common Installation Add-Ons Available

Where relevant, you can add common installation extras such as valve kits, bases, access-related items, removal, electrical options or other site-specific upgrades before checkout.

Built Around Brisbane and Gold Coast Homes

Our product and installation options are selected with common Brisbane and Gold Coast homes in mind, including local water quality, access issues, plumbing layouts, replacement requirements and typical installation conditions.

One Simple Order

Add the product and selected options to cart in one order, instead of trying to organise separate suppliers, installers, parts and payments yourself.

Practical Help Before You Buy

Not sure which size, model or installation option is right? Installed Today gives you a clearer path to compare your options before you order.

Designed to Make Your Decision Easier

Installed Today is built for customers who want a faster, clearer and more convenient way to buy.

Instead of guessing what is included, waiting for basic pricing or trying to work out which extras may be needed, you can review the product, compare your options and move forward with confidence.

Choose supply only if you just need the product.

Choose an optional supplied and installed package where installation is available and you want the product and selected install options organised in one order.

Add common extras before checkout if your job needs additional parts, removal, access support or site-specific options.

It is a simpler way to organise the product, the selected extras and the parts of the job that matter most.

Important Installation Note

Installation availability, inclusions and add-ons vary by product type, service area, site access, existing services, selected options and property requirements.

Some jobs may require additional work, upgrades or checks before installation can proceed. Final suitability may need to be confirmed based on site conditions, plumbing, electrical requirements, valves, drainage, access and compliance requirements.

Supply-only orders do not include installation, old unit removal, disposal, valve kits, electrical work, plumbing alterations or compliance upgrades unless these are clearly selected or included in your order.

Fast Delivery and Install-Aligned Shipping

Installed Today makes delivery simple, whether you are ordering supply-only or choosing an optional install package.

For supply-only orders, you can select from available delivery options at checkout. For eligible orders with installation selected, shipping is included and coordinated to align with your selected installation period where possible.

Delivery Options

Same Day Delivery

Same day delivery may be available for selected hot water systems in Brisbane and Gold Coast metro areas when ordered before 8:00am.

Availability depends on stock, courier capacity, delivery location, product type and safe transport conditions.

Express Delivery

Express delivery is available on selected products and locations, with an estimated delivery timeframe of 1–4 business days.

Standard Delivery

Standard delivery is available on selected products, with an estimated delivery timeframe of 2–8 business days.

Free Shipping with Installation

When you select an eligible installation package, delivery is included as part of the supplied and installed order.

Your product delivery will be organised to align with your selected installation period where possible, helping avoid separate courier timing, storage issues or delays between delivery and installation.

Fast Metro Delivery

Most hot water orders in metro areas are delivered quickly, with many arriving within 1 business day depending on stock, location, order time and courier availability.

Weather and Transport Delays

Hot water systems are large, heavy products and cannot always be transported safely during rain or unsafe handling conditions.

Delivery timeframes may be affected if wet weather impacts loading, unloading, transport access or safe delivery conditions.

Express Delivery Refund

If your express delivery order takes longer than the estimated 1–4 business day express timeframe, your order will move to the standard 2–8 business day delivery timeframe and your express shipping charge will be refunded automatically.

Order Tracking

We will send your delivery details once your order has been dispatched or scheduled.

For supplied and installed orders, delivery timing may be coordinated around your selected installation period rather than sent as a separate courier-only delivery.

Need Help with Delivery?

Not sure whether to choose supply-only delivery or an optional install package? Contact our team before ordering and we can help you understand the best option for your product, location and timing.