Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System

The Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System is available online from Hot Water Outlet as a supply-only natural gas instantaneous water heater with metro delivery available in selected areas Australia wide.

Customers can purchase the Rinnai Infinity B16 Natural Gas as a supply-only hot water system and request assistance arranging installation quotes after purchase through licensed local installers in selected metro regions.

The Rinnai Infinity B16 Natural Gas is a compact continuous flow hot water system designed for small to medium homes with one bathroom and moderate hot water demand. With 16 L/min flow rate at a 25°C rise, 20 L/min flow rate at a 20°C rise, 6.1 Star equivalent energy rating, Puretemp™ temperature stability technology, natural gas compatibility, compact outdoor design and a 25-year extended heat exchanger warranty pathway, it is a practical replacement option for homes connected to mains natural gas.

About the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System

The Rinnai Infinity B16 Natural Gas is a gas continuous flow water heater designed to heat water only when a hot water tap is turned on.

Unlike a storage tank, it does not keep a full cylinder of water hot throughout the day. Instead, water passes through the unit and is heated on demand using natural gas. This makes it a compact and efficient option for smaller households, one-bathroom homes, granny flats, townhouses, rental properties and replacement jobs where mains natural gas continuous flow hot water is preferred.

The B16 model is ideal for one bathroom and moderate hot water demand. It is best suited to households that want a compact outdoor gas hot water unit with reliable temperature control and no stored hot water tank.

Buy Rinnai Infinity B16 Natural Gas Supply Only

Order the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System online from Hot Water Outlet with metro delivery available in selected areas across Australia.

This option is ideal if you already have a licensed gas fitter or plumber arranged and only need the unit supplied.

The supply-only product price includes the hot water system itself.

Installation, old system removal, disposal, valve kits, gas fitting work, plumbing alterations, gas pipe upgrades, compliance upgrades and additional site requirements are not included unless separately quoted.

Supply-only is best for customers searching for:

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• Rinnai Infinity B16 supply only

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• 16 litre natural gas hot water system

• One bathroom natural gas hot water system

Installation Quotes Available After Purchase

Hot Water Outlet does not directly provide installation services.

After purchasing the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System, customers in selected metro areas may request assistance arranging installation quotes through licensed local plumbers and gas fitters.

Installation quote availability depends on:

• service location

• installer availability

• natural gas suitability

• gas supply capacity

• valve kit requirements

• outdoor installation location

• water pressure

• pipework

• access requirements

• compliance requirements

Additional installation costs may apply for:

• valve upgrades

• gas fitting work

• plumbing changes

• gas pipe upgrades

• pipework alterations

• difficult access

• electrical connection work

• old system removal

• disposal

• compliance upgrades

Rinnai Infinity B16 Natural Gas Delivery Brisbane

Hot Water Outlet offers metro delivery for the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System in selected Brisbane areas.

Customers can order online and request assistance arranging installation quotes after purchase where available.

Rinnai Infinity B16 Natural Gas Delivery Gold Coast

Hot Water Outlet offers metro delivery for the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System in selected Gold Coast service areas.

Customers can purchase online and organise installation separately or request help arranging installation quotes after purchase.

Rinnai Infinity B16 Natural Gas Delivery Sydney

Hot Water Outlet offers metro delivery for the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System in selected Sydney metro areas.

Customers can order online with installation quote assistance available after purchase in selected locations.

Rinnai Infinity B16 Natural Gas Delivery Melbourne

Hot Water Outlet offers metro delivery for the Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System in selected Melbourne metro areas.

Customers can purchase the system online and request help arranging installation quotes after delivery.

Is the Rinnai Infinity B16 Natural Gas Right for Your Home?

The Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System may be suitable if you are replacing an existing natural gas instantaneous water heater and your household has moderate hot water demand.

It is commonly suited to one-bathroom homes, granny flats, smaller households, townhouses and rental properties where mains natural gas is already available and a compact outdoor gas hot water unit is preferred.

Because this is the natural gas version, the gas type must match the property. Natural gas and LPG models are not interchangeable, so the correct model must be selected before ordering or installation.

This system may suit you if:

• you are replacing an existing natural gas continuous flow hot water system

• your property is connected to mains natural gas

• you want a compact 16L instantaneous gas hot water system

• your home has one bathroom and moderate hot water demand

• you want hot water heated on demand

• you want a 6.1 Star equivalent energy rating

• you want Puretemp™ temperature stability technology

• you want optional controller compatibility

• you want a compact outdoor installation

• your natural gas supply, water pressure and access are suitable

• you prefer supply-only purchase flexibility

Extra work may be required if:

• the system is being moved to a new location

• the existing system is LPG, not natural gas

• gas pipe sizing does not suit the unit

• the existing gas supply capacity is not suitable

• existing valves are old, missing or non-compliant

• extra pipework or plumbing changes are needed

• water pressure is outside the required range

• access is restricted

• electrical connection or weatherproof power supply requirements need work

• the old system needs additional removal or disposal work

• the installation location does not meet outdoor clearance requirements

Key Features of the Rinnai Infinity B16 Natural Gas

• Natural gas continuous flow hot water system

• Rinnai Infinity B Series 16L model

• Product code REU-BM1620W

• Ideal for one bathroom

• Suitable for small to medium homes with moderate demand

• 16 L/min flow rate at a 25°C rise

• 20 L/min flow rate at a 20°C rise

• 6.1 Star equivalent energy rating

• Heats water only when a hot tap is in use

• Compact outdoor wall-mounted design

• Quality Japanese design and manufacturing

• Puretemp™ temperature stability technology

• Precise temperature control for safety and convenience

• Status operation monitor

• Compatible with low-flow rated shower fixtures

• Suitable for higher ambient water temperatures

• Natural gas model for mains gas properties

• Optional hot water controller compatibility

• Pipe covers, recess boxes and security brackets available as related add-ons

• 25-year extended heat exchanger warranty pathway under Rinnai conditions

• Compact 13kg unit weight

• 120 kPa minimum water pressure

• 1000 kPa maximum water pressure

• 1.5 L/min minimum operating water flow

Quick Specs

Brand: Rinnai
Range: Infinity B Series
Product: Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System
Product Code: REU-BM1620W
System Type: Gas Continuous Flow Hot Water System
Gas Type: Natural Gas
Installation Type: External continuous flow installation
Recommended Use: One bathroom and moderate hot water demand
Warm Climate Shower Outlet Guide: 1 shower outlet
Cool Climate Shower Outlet Guide: 1 shower outlet
Energy Rating: 6.1 Star equivalent
Flow Rate at 25°C Rise: 16 L/min
Flow Rate at 20°C Rise: 20 L/min
Minimum Operating Water Flow: 1.5 L/min
Minimum Water Pressure: 120 kPa
Maximum Water Pressure: 1000 kPa
Natural Gas Rate Minimum: 16 MJ/hr
Natural Gas Rate Maximum: 124 MJ/hr
Factory Default Temperature: 50°C / 60°C depending on model setup
Electrical Consumption: 68W
Status Monitor: Yes
Hot Water Connection: 15mm
Cold Water Connection: 15mm
Gas Connection: 20mm
Height: 531mm
Height Including Brackets: 571mm
Width: 351mm
Depth Including Brackets: 202mm
Weight: 13kg
Warranty: 25-year extended heat exchanger warranty pathway subject to Rinnai conditions

Natural Gas Continuous Flow Hot Water

This product is the natural gas version of the Rinnai Infinity B16.

It is designed for properties connected to mains natural gas. The gas type must be correct before ordering or installation because natural gas and LPG units are different product pathways.

If your home uses bottled LPG, choose the LPG version instead. If your home is connected to mains natural gas, this natural gas version is the correct pathway.

16L Continuous Flow Performance

The Rinnai Infinity B16 Natural Gas is rated at 16 litres per minute at a 25°C temperature rise and 20 litres per minute at a 20°C temperature rise.

This makes it suitable for one-bathroom homes and moderate hot water demand. Flow performance can vary depending on incoming water temperature, selected outlet temperature, shower flow rate, natural gas supply, water pressure and how many hot water outlets are used at the same time.

For homes with two bathrooms, higher shower flow rates or stronger simultaneous hot water use, a larger model such as a 20L or 26L continuous flow unit may be more suitable.

6.1 Star Equivalent Energy Rating

The Rinnai Infinity B16 Natural Gas has a 6.1 Star equivalent energy rating.

Because it heats water on demand, it avoids the standby heat loss associated with stored hot water tanks. This can help reduce running costs compared with some older gas storage systems depending on household use, natural gas pricing, outlet demand and installation conditions.

Puretemp™ Temperature Stability Technology

The Rinnai Infinity B16 includes Puretemp™ temperature stability technology.

This is designed to help maintain steady hot water temperature even when flow changes occur. Temperature stability is important in everyday use, especially when showering or using multiple fixtures in a small home.

Compact Outdoor Design

The Rinnai Infinity B16 Natural Gas has a compact wall-mounted design.

With a height including brackets of 571mm, width of 351mm, depth including brackets of 202mm and weight of 13kg, it is much smaller than a storage tank and can suit homes where space is limited.

Installation location still needs to meet outdoor clearance, access, gas fitting, water connection, electrical and compliance requirements.

No Stored Tank

The Rinnai Infinity B16 Natural Gas does not use a hot water storage tank.

Hot water is produced as it is needed, which saves space and removes the need to store a full cylinder of heated water. This can be useful for homes replacing an older instantaneous gas unit or moving away from a small storage system where the site suits natural gas continuous flow installation.

Status Operation Monitor

The Rinnai Infinity B16 Natural Gas includes a status operation monitor.

This helps provide simple operating information and supports service diagnostics where required.

Optional Hot Water Controllers

The Rinnai Infinity B16 Natural Gas can be enhanced with optional hot water controllers where compatible and installed correctly.

Controllers can add convenience and help manage selected water temperature from suitable locations. Controller compatibility, wiring and placement should be confirmed before installation.

Outdoor Installation Only

The Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System is designed for external installation.

It should not be installed internally. Gas continuous flow water heaters must be installed in accordance with manufacturer instructions, gas fitting rules, ventilation requirements, flue clearance requirements and local compliance standards.

Water Pressure Requirements

The Rinnai Infinity B16 Natural Gas lists a 120 kPa minimum water pressure and 1000 kPa maximum water pressure.

Water pressure should be checked before installation. If site pressure is too high, a pressure limiting valve or other pressure control work may be required to protect the unit and comply with installation requirements.

Natural Gas Supply Requirements

The Rinnai Infinity B16 Natural Gas has a listed natural gas rate range from 16 MJ/hr to 124 MJ/hr.

The gas meter, gas pipe sizing and isolation valve arrangement must be suitable for the appliance. Some homes may require licensed gas fitting work before the system can be installed or operated correctly.

Electrical Requirement

The Rinnai Infinity B16 Natural Gas has listed electrical consumption of 68W.

Continuous flow gas hot water systems still require electrical power for ignition, controls and fan operation. A suitable weatherproof power supply may be required depending on the site and selected installation setup.

Common Uses

The Rinnai Infinity B16 Natural Gas Continuous Flow Hot Water System can be suitable for:

• natural gas continuous flow hot water replacement

• external gas hot water installations

• one-bathroom homes

• small to medium homes

• granny flats

• townhouses

• rental properties

• investment homes

• properties connected to mains natural gas

• homes wanting compact wall-mounted hot water

• homes replacing older natural gas instantaneous units

• homes wanting hot water heated on demand

Frequently Asked Questions

Can I buy the Rinnai Infinity B16 Natural Gas supply only?

Yes. You can buy the Rinnai Infinity B16 Natural Gas as a supply-only product where available if you already have a licensed gas fitter or plumber arranged.

Does Hot Water Outlet install natural gas hot water systems?

No. Hot Water Outlet does not directly provide installation services. Customers may request assistance arranging installation quotes after purchase in selected metro areas.

Can I get an installation quote after purchasing?

Yes. Customers in selected metro areas may request help arranging installation quotes through licensed local installers after purchasing the system.

Is delivery available Australia wide?

Metro delivery is available in selected service areas across Australia. Delivery availability may vary depending on location and product type.

Is this model natural gas or LPG?

This page is for the natural gas version of the Rinnai Infinity B16. The selected gas type must match the property before ordering or installation.

Can this Rinnai natural gas unit be installed indoors?

No. The Rinnai Infinity B16 Natural Gas is designed for external installation. It should not be installed internally.

What is the product code?

The Rinnai Infinity B16 product code is REU-BM1620W.

What flow rate does the Rinnai Infinity B16 provide?

The Rinnai Infinity B16 is listed at 16 L/min at a 25°C rise and 20 L/min at a 20°C rise.

How many bathrooms is the Rinnai Infinity B16 suitable for?

The Rinnai Infinity B16 is ideal for one bathroom and moderate hot water demand. Homes with higher demand may need a larger continuous flow model.

What is the energy rating?

The Rinnai Infinity B16 has a 6.1 Star equivalent energy rating.

What is Puretemp™?

Puretemp™ is Rinnai’s temperature stability technology designed to help maintain steady hot water temperature even when flow conditions change.

Does the Rinnai Infinity B16 run out of hot water?

As a continuous flow system, the Rinnai Infinity B16 heats water on demand rather than storing it in a tank. It can keep producing hot water while gas, water and power supply are available and the demand stays within the unit’s capacity.

What is the minimum water pressure?

The Rinnai Infinity B16 lists a 120 kPa minimum water pressure.

What is the maximum water pressure?

The Rinnai Infinity B16 lists a 1000 kPa maximum water pressure.

What is the minimum operating water flow?

The minimum operating water flow is listed as 1.5 L/min.

What is the natural gas rate?

The natural gas rate is listed from 16 MJ/hr minimum to 124 MJ/hr maximum.

What are the connection sizes?

The Rinnai Infinity B16 lists 15mm hot water connection, 15mm cold water connection and 20mm gas connection.

What are the dimensions?

The Rinnai Infinity B16 is listed at 531mm high, 351mm wide and 202mm deep including brackets. Height including brackets is listed at 571mm.

How much does the Rinnai Infinity B16 weigh?

The listed unit weight is 13kg.

Does the Rinnai Infinity B16 need power?

Yes. The unit requires electrical power for operation. Electrical consumption is listed at 68W.

What factory default temperature is available?

The factory default temperature is listed as 50°C / 60°C depending on model setup and application requirements.

Can I add controllers?

Yes. Optional compatible hot water controllers may be available for added convenience and temperature control subject to correct installation.

What is the warranty on the Rinnai Infinity B16?

The Rinnai Infinity B16 has a 25-year extended heat exchanger warranty pathway subject to participating in Rinnai’s scheduled service program and warranty terms. Other warranty terms should be checked against the current warranty documentation before purchase.

Is the Rinnai Infinity B16 Natural Gas good for replacing an old natural gas hot water system?

Yes. The Rinnai Infinity B16 Natural Gas can be a practical replacement option for selected external natural gas continuous flow hot water systems provided the gas supply, water pressure, electrical connection, pipework, clearances and household hot water demand are suitable.

What is the difference between the Rinnai Infinity B16 Natural Gas and B20 Natural Gas?

The Rinnai Infinity B20 Natural Gas provides a higher flow rate than the B16 and may suit homes with greater hot water demand. The B16 is generally better suited to one-bathroom homes with moderate use, while the B20 can provide more capacity for larger demand where the gas supply and installation conditions are suitable.

What is the difference between natural gas and LPG versions?

The natural gas version is designed for homes connected to mains natural gas. The LPG version is designed for properties using bottled gas. The correct gas type must be selected before ordering or installation.

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.

Buying a new hot water system or hot water part should be simple. Hot Water Outlet helps you compare hot water systems, valves, thermostats, elements, pipework and fittings in one place, so you can choose the products that suit your home, budget and hot water needs without the back and forth.

Whether you already know exactly what you need or you are still comparing electric, gas, instant gas, gas storage or heat pump hot water options, Hot Water Outlet makes it easier to order with confidence.

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Key specs, sizing details, tank capacity, flow rate, gas type, energy source, dimensions, warranty information, product features and suitability notes are shown clearly, so you can compare hot water systems properly before you buy.

Valves and Accessories Available

Where relevant, you can add common hot water parts such as tempering valves, pressure relief valves, duo valves, non-return valves, thermostats, elements, pipework and fittings to help complete your order.

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It is a simpler way to buy the hot water products and parts that matter most.

Important Note

Product suitability can vary by property, existing services, energy source, gas type, available space, connection points, pressure requirements and local compliance requirements. Always check product specifications carefully and confirm the selected hot water system, valves, fittings and accessories are suitable for your property before ordering.

Standard Delivery: 2–8 business days

Express Delivery: 1–4 business days

90% of products are delivered the next business day where stock, postcode eligibility and freight availability allow.

Delivery timeframes are estimates and may vary by product, stock location, delivery postcode, carrier availability and order timing. Wet weather, storms, flooding or unsafe site access may delay delivery and are additional to any advertised or guaranteed freight timeframes.