• Rinnai Infinity 20 Continuous Flow Natural Gas Hot Water Pre-Set 50 Degrees INF20N50B

    $1,440
    $738.33 (34%) off RRP of $2,178
    $738.33 (34%) off RRP of $2,178

    Rinnai Infinity 20 Continuous Flow Natural Gas Hot Water Pre-Set 50 Degrees INF20N50B

    $1,440
    $738.33 (34%) off RRP of $2,178
    $738.33 (34%) off RRP of $2,178
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    Text: Natural Gas 50 Degrees
    • Overview
    • Specifications & manuals
    • Legendary service
    • Delivery, services & returns
    • Questions & answers

    Overview

    The Rinnai Infinity B20 Gas Continuous Flow Hot Water System delivers reliable, energy-efficient hot water tailored for Australian households. Specifically designed for homes with one bathroom—or up to two in warmer climates—this compact yet powerful unit ensures you never run out of hot water, no matter the demand.

    Featuring a continuous flow design, the Infinity B20 heats water on demand, significantly reducing energy usage compared to traditional storage systems. Its impressive 6 Star energy rating underscores its commitment to sustainability while delivering a strong 20-litre per minute flow rate, making it an ideal solution for growing families.

    Built to thrive in Australia’s diverse climate conditions, the Infinity B20 combines durable construction with smart design. A slim, space-saving profile allows flexible installation options, while an easy-to-read status monitor and user-friendly temperature controls enhance daily convenience. Puretemp temperature stability technology ensures a consistent and comfortable hot water experience, even during multiple back-to-back showers.

    Available in both Natural Gas and LPG models, this system integrates seamlessly with low-flow fixtures and optional Rinnai hot water controllers for added control. Whether upgrading your existing system or installing in a new build, the Infinity B20 is engineered for performance, efficiency, and peace of mind.
    Compact Space-Saving Design

    Built with modern homes in mind, the Compact, Space-Saving Design ensures easy installation in smaller outdoor or utility spaces. Despite its slim profile, the system delivers full performance, providing reliable hot water without taking up unnecessary room or limiting installation flexibility.

    Endless Hot Water on Demand

    Enjoy a constant supply of hot water exactly when you need it. This energy-smart system heats water only as it flows, making it ideal for households that demand reliable performance without unnecessary energy use or waste.

    Puretemp Technology

    Engineered for comfort, Puretemp Technology keeps water temperature steady even when flow rates vary. This advanced system eliminates sudden fluctuations, delivering a smooth and consistent hot water experience every time, ensuring safety, reliability, and comfort across all household uses.

    Optional Hot water Controllers

    Enhance convenience with Rinnai’s BC145 and MC145 controllers, designed to give precise fingertip control over water temperature. Ideal for bathrooms or kitchens, these user-friendly units improve safety, comfort, and efficiency by allowing tailored temperature settings for different household needs.

    Specifications & manuals

    key Specifications
    Brand
    Rinnai
    Finish Colour
    White
    Finish Colour Description
    Off White Cabinet Finish.
    Height (mm)
    531 mm
    Width (mm)
    351 mm
    Depth (mm)
    202 mm
    Model Number
    INF20N50B
    Fuel Type
    Natural Gas
    Weight (kg)
    14 kg
    Notes
    ** A 10-amp outside waterproof power point is required to operate the electronic ignition**
    warranty
    Manufacturer Warranty
    3 Years
    Use
    Not intended or designed for commercial use.
    additional Dimensions
    Package Dimensions (H x W x D)
    685 x 445 x 280
    Package Weight (kg)
    16
    energy Efficiency
    Energy Star Rating
    6
    other Features
    Hot Water Selection
    Continuous Flow
    Flow Per Minute
    20 L
    Temperature Range - Maximum
    50 °C
    Hot Water Type
    Continuous
    Features
    • 20L Per Minute Flow Rate: Delivers sufficient hot water for one to two bathrooms in warmer climates.
    • Puretemp Technology: Maintains stable water temperature to enhance comfort and safety.
    • 6 Star Energy Rating: High efficiency for lower energy use and reduced environmental impact.
    • Compact Outdoor Unit: Slim design allows easy installation in confined spaces.
    • Durable Build: Engineered to withstand Australia's varying weather conditions.
    • Digital Temperature Display: User-friendly controls for precise temperature adjustments.
    • Natural Gas or LPG Options: Compatible with different gas setups for flexible installation.
    • Low Minimum Operating Flow: Starts heating at just 1.5L/min for better performance with low-flow fixtures.
    • Optional Controller Integration: Add hot water controllers for extra convenience and temperature control.
    • Trusted Rinnai Engineering: Backed by advanced Japanese design and manufacturing standards.
    electrical Connection
    Type of connection
    10A plug & lead
    Length of cord
    1 m
    country of Origin
    Origin
    Japan

    Legendary service

    The Appliances Online Net Promoter Score (NPS) is based on feedback from 89,897 people, collected between August 2024 to August 2025. Learn more about the Net Promoter Score (NPS).
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    Delivery, services & returns

    Appliances Online is all about legendary service. We offer free next business day delivery, free connection, free removal and free recycling, and we even offer Saturday delivery and, in some locations, a Premium Delivery option that allows you to choose your own 2-hour delivery window.

    Questions & answers

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