Rinnai Hotflo 400L Electric Hot Water System

The Rinnai Hotflo 400L Electric Hot Water System is available from Installed Today as a supply-only electric storage water heater or as a complete supply and install package in selected Brisbane and Gold Coast service areas.

Choose the unit only if you already have a licensed plumber or electrician arranged, or check your supply and install package to confirm standard installation, valve kit requirements, electrical suitability, site access, water pressure requirements and available installation timeframes before checkout.

The Rinnai Hotflo 400L electric storage water heater is the largest-capacity model in the Rinnai Hotflo electric storage range, designed for large families and high-demand households that need an abundant stored hot water supply. With 420L rated capacity, vitreous enamel lined steel tank, inbuilt anode protection, single or twin element configuration options, dual handed connections, internal or external installation suitability, and a 10-year cylinder warranty, it is a strong choice for replacing an older large electric hot water system.

About the Rinnai Hotflo 400L Electric Water Heater

The Rinnai Hotflo 400L Electric Hot Water System is designed for big households that need reliable stored hot water without loss of pressure.

Rinnai positions the Hotflo 400L as the highest-capacity electric storage tank in the Hotflo range, making it a practical option for larger Australian families, shared homes, rental properties and homes with high daily hot water demand.

Although commonly referred to as a 400L electric hot water system, the listed rated capacity is 420L. This gives the system a large stored hot water reserve for homes where multiple showers, laundry use and kitchen hot water demand can occur close together.

Buy Rinnai Hotflo 400L Supply Only

Order the Rinnai Hotflo 400L Electric Hot Water System online as a supply-only hot water system. This option is ideal if you already have a licensed plumber or electrician arranged and only need the unit supplied.

The supply-only product price is for the hot water system itself. Installation, old system removal, disposal, valve kits, electrical work, plumbing alterations, compliance upgrades and additional site requirements are not included unless selected separately as add-ons.

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Rinnai Hotflo 400L Supplied and Installed in Brisbane & Gold Coast

Installed Today can supply and install the Rinnai Hotflo 400L Electric Hot Water System in selected Brisbane and Gold Coast service areas.

This option is designed for customers who want the hot water system supplied and professionally installed through one streamlined online order. The supply and install pathway helps confirm whether this system suits your property, whether a valve kit is required, whether the existing location is suitable, whether the selected element rating matches the electrical setup, and whether any additional installation add-ons may be needed before checkout.

The installed-from price is based on the product plus the matching standard installation option. Final pricing may vary depending on access, electrical suitability, valve requirements, old system removal or disposal selections, plumbing changes, compliance requirements and selected add-ons.

Rinnai Hotflo 400L Installation in Brisbane

For Brisbane customers, the Rinnai Hotflo 400L Electric Water Heater can be ordered with supply and install options through Installed Today. This is suitable for homes replacing an existing large electric hot water system where the current location, access, plumbing and electrical supply are suitable for the selected installation option.

The 400L size can be a strong fit for larger Brisbane family homes, shared homes, high-use rental properties, investment homes and households where a 250L or 315L system may not provide enough stored hot water.

Customers in selected Brisbane suburbs can complete the installation check before checkout to confirm whether standard installation, valve kit selection, electrical work, extra plumbing add-ons, old system removal or disposal options may be required.

This makes the page suitable for customers searching for Rinnai Hotflo 400L installation Brisbane, Rinnai electric hot water supplied and installed Brisbane, and 400L electric hot water replacement Brisbane.

Rinnai Hotflo 400L Installation in Gold Coast

Gold Coast customers can also order the Rinnai Hotflo 400L Electric Hot Water System with supply and install options in selected service areas.

This pathway is useful for homeowners, landlords, property managers, unit owners and renovators who want the product and installation organised together instead of buying the unit separately and arranging trades afterwards.

Complete the supply and install check to confirm whether the existing setup is suitable and whether additional items such as valve kits, electrical work, pipework, access requirements, base support or old system disposal may be required.

This helps customers searching for Rinnai Hotflo 400L installed Gold Coast, Rinnai electric hot water installation Gold Coast, and 400L electric hot water supply and install Gold Coast.

Is the Rinnai Hotflo 400L Right for Your Home?

The Rinnai Hotflo 400L Electric Hot Water System may be suitable if you are replacing a large electric storage water heater and want the biggest capacity option in the Rinnai Hotflo electric storage range.

It is commonly suited to larger family homes, shared homes, high-use households, rental properties, investment properties and homes with very high daily hot water demand.

Suitability depends on household size, shower length, hot water habits, climate, tariff setup, fixture flow rates, available installation space, plumbing condition, electrical connection and the ability of the existing location to suit a large tank.

This system may suit you if:

• You are replacing an existing large electric storage hot water system

• You want a 400L-class electric hot water unit

• You need the largest capacity in the Rinnai Hotflo electric storage range

• Your household has high daily hot water demand

• Your household has around 8 or more people, depending on usage

• You want single or twin element configuration options

• You want a vitreous enamel lined steel tank

• You want inbuilt anode protection

• You need internal or external installation suitability

• Your property has suitable access and installation space

• Your plumbing and electrical setup are suitable for the selected installation option

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

Extra work may be required if:

• The system is being moved to a new location

• Existing valves are old, missing or non-compliant

• Extra pipework or drainage changes are needed

• Electrical upgrades are required

• Access is restricted

• A compliant base, tray, drainage or insulation is required

• The old system needs additional removal or disposal work

• The selected element rating does not match the existing electrical setup

• The existing water pressure requires valve or pressure control changes

• A twin element model requires electrical work to suit the site

• The existing location does not suit the larger tank size or filled weight

Key Features of the Rinnai Hotflo 400L

• 400L-class electric storage hot water system

• Product code EHFA400

• Largest capacity model in the Rinnai Hotflo electric storage range

• Ideal for larger families and high-demand homes

• Rated capacity of 420L

• Suitable for around 8 to 9 people in warm climate peak-period use

• Suitable for 8 or more people in cool climate peak-period use

• Suitable for 6 or more people in cool climate off-peak use

• Vitreous enamel lined steel tank for durability

• Inbuilt anode protection to help extend tank life

• Dual handed connections for flexible installation

• Pressure temperature relief valve included

• Suitable for internal or external installation

• Thermostatically controlled operation

• Automatic safety temperature shut-off

• Single and twin element configurations available

• Lead free

• Standard sizing for easier replacement and emergency changeovers

• 3.6kW and 4.8kW heating element options

• 240V 50Hz electrical supply

• IPX4 ingress protection rating

• Rp 3/4 water connections

• 10-year cylinder warranty under Rinnai warranty terms

Quick Specs

Brand: Rinnai
Range: Hotflo Electric Storage
Product: Rinnai Hotflo 400L Electric Hot Water Storage
Product Code: EHFA400
System Type: Electric Storage Hot Water System
Rated Capacity: 420L
Common Product Class: 400L electric storage
Recommended Household Size: Larger families and very high-demand homes
Warm Climate Peak-Period Suitability: Around 8 to 9 people
Cool Climate Peak-Period Suitability: 8 or more people
Cool Climate Off-Peak Suitability: 6 or more people
Element Configuration: Single or twin element options available
Heating Elements Available: 3.6kW and 4.8kW
Electrical Supply: AC 240V 50Hz
Tank Lining: Vitreous enamel lined steel
Anode Protection: Inbuilt sacrificial anode
Installation Type: Internal or external installation
Water Connections: Rp 3/4
Connection Size: 20mm
Relief Valve Setting: 1000 kPa
Expansion Control Setting: 850 kPa
Maximum Water Supply Pressure With ECV: 680 kPa
Maximum Water Supply Pressure Without ECV: 800 kPa
Ingress Protection Rating: IPX4
Overall Height: 1840mm
Outlet Height: 1587mm
Inlet Height: 237mm
Lower Electrical Connection Height: 163mm
Tank Diameter: 675mm
Empty Weight: 96kg
Cylinder Warranty: 10 years, subject to Rinnai warranty terms

Vitreous Enamel Lined Tank

The Rinnai Hotflo 400L uses a vitreous enamel lined steel tank designed to support long-term durability.

Vitreous enamel lining helps protect the steel tank surface from stored hot water conditions. The system also includes inbuilt anode protection, which helps protect the cylinder as part of the tank’s corrosion protection design.

Correct installation, water pressure control, water quality, valve setup and servicing conditions can all affect hot water system lifespan and warranty outcomes.

Inbuilt Anode Protection

The Rinnai Hotflo 400L Electric Water Heater includes inbuilt sacrificial anode protection to help extend the life of the hot water tank.

Anodes are designed to gradually wear over time as part of protecting the cylinder. This makes maintenance and water quality checks important for long-term performance, especially in large storage systems where water quality and operating conditions can have a major effect on service life.

Single and Twin Element Options

The Rinnai Hotflo 400L is available in single and twin element configurations.

A single element system is commonly used for standard electric storage replacement and may suit homes connected to suitable off-peak or standard tariff arrangements. A twin element system can provide faster recovery and additional hot water support during peak usage periods where the electrical setup and tariff arrangement suit it.

The correct option depends on household demand, selected variant, existing wiring, tariff connection and installation requirements.

Internal or External Installation

The Rinnai Hotflo 400L Electric Hot Water System is suitable for internal or external installation where the location is compliant and suitable.

This gives flexibility for homes replacing an existing indoor or outdoor electric storage system. Installation location still needs suitable access, drainage, ventilation, base support, valve setup, electrical connection and compliance with plumbing and electrical requirements.

Because this is a large-capacity tank, access, base condition and available working space should be checked carefully before ordering or installation.

Dual Handed Connections

The Rinnai Hotflo 400L includes dual handed connections to allow more flexibility during installation.

This can make replacement easier because the water connections can better suit different existing plumbing layouts. Dual handed connection options are useful in like-for-like replacement jobs where matching existing pipework can help reduce unnecessary plumbing changes.

Thermostatic Safety Control

The Rinnai Hotflo 400L is thermostatically controlled and includes automatic safety temperature shut-off.

This helps control stored water temperature and provides added protection as part of the system’s safety design.

420L Rated Storage Capacity

The 420L rated capacity makes this model the largest capacity option in the Rinnai Hotflo electric storage range.

This size is designed for homes where a smaller 250L or 315L system may not be enough. It can support larger families, shared households, rental properties and homes where hot water use is heavy across showers, laundry and kitchen demand.

For lower-demand homes, a 250L or 315L model may be more suitable. For households that want maximum stored hot water capacity, the Hotflo 400L is the stronger option.

Heating Recovery Guide

The recovery rate depends on the heating element size, incoming water temperature, thermostat setting, tank condition and power supply type.

As a general guide for a 50°C temperature rise:

• 3.6kW element heats approximately 61.9 litres per hour

• 4.8kW element heats approximately 82.5 litres per hour

A larger element can reheat water faster, but the correct option depends on electrical suitability, tariff setup, household demand and installation requirements.

Common Uses

The Rinnai Hotflo 400L Electric Hot Water System can be suitable for:

• Larger family homes

• Very high-demand households

• Shared households

• Larger townhouses

• Rental properties

• Investment properties

• Electric storage hot water replacement

• Internal or external hot water installations

• Homes needing more capacity than a 315L system

• Homes with heavy shower, laundry and kitchen hot water use

• Homes needing the largest Hotflo electric storage model

• 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, shower length, hot water usage, tariff setup, installation location, plumbing condition, electrical supply, water pressure and compliance requirements.

Why Order From Installed Today?

Installed Today gives customers a simple way to order the Rinnai Hotflo 400L Electric Hot Water System as either a product-only purchase or a supply and install package in selected Brisbane and Gold Coast service areas.

You can compare the unit-only price, check the installed-from price, complete the installation compatibility check and select matching installation add-ons before checkout.

Why customers choose Installed Today:

• Supply only or supply and install options

• Installed-from pricing shown separately

• Compatibility check before checkout

• Valve kits and installation add-ons available online

• Brisbane and Gold Coast service area support

• Suitable for electric hot water replacement orders

• Clear product and installation pathway before checkout

• Largest-capacity Rinnai Hotflo electric storage option

• Product-only ordering for customers with their own licensed installer

• Internal and external installation suitability

• Single and twin element options available

• Rinnai electric hot water system from a recognised hot water brand

• Large capacity for very high-demand households

Frequently Asked Questions

Can I buy the Rinnai Hotflo 400L supply only?

Yes. You can buy the Rinnai Hotflo 400L as a supply-only product if you already have a licensed installer arranged. The unit-only price does not include installation, old system removal, disposal, valve kits, electrical work, plumbing alterations or compliance upgrades unless selected separately.

Can I get the Rinnai Hotflo 400L installed in Brisbane?

Yes. Supply and install options are available in selected Brisbane service areas. Complete the installation check to confirm whether the standard installation option suits your property and whether additional add-ons may be required.

Can I get the Rinnai Hotflo 400L installed in Gold Coast?

Yes. Selected Gold Coast service areas are available. Installation suitability depends on access, existing plumbing, electrical requirements, drainage, valve condition, compliance and selected add-ons.

Is installation included in the product price?

No. The main product price is the unit-only price. The installed-from price is shown separately so you can compare supply only against supply and install.

What does the installed-from price include?

The installed-from price is based on the Rinnai Hotflo 400L unit plus the matching standard installation option. Final pricing may vary depending on valve kits, removal or disposal selections, pipework, electrical work, access, compliance and other selected add-ons.

Do I need a valve kit?

Many hot water replacements require compatible valves to meet installation and compliance requirements. The installation check helps identify whether a valve kit is recommended for your order.

What is the product code for the Rinnai Hotflo 400L?

The product code for the Rinnai Hotflo 400L electric storage water heater is EHFA400.

What is the rated capacity?

The Rinnai Hotflo 400L has a listed 420L rated capacity.

Why is it called 400L if the rated capacity is 420L?

It is commonly sold as the Rinnai Hotflo 400L electric storage model, while the listed rated capacity is 420L. This places it in the 400L-class large electric storage category.

How many people is the Rinnai Hotflo 400L suitable for?

The Rinnai Hotflo 400L is designed for larger families and high-demand homes. It is listed for around 8 to 9 people in warm climate peak-period use, 8 or more people in cool climate peak-period use, and 6 or more people in cool climate off-peak use. Actual suitability depends on shower length, usage pattern, tariff setup, climate and household demand.

Can the Rinnai Hotflo 400L be installed outside?

Yes. The Rinnai Hotflo 400L is suitable for internal or external installation where the location is compliant and suitable.

Is the Rinnai Hotflo 400L single element or twin element?

The Rinnai Hotflo 400L is available in single and twin element configurations.

What is the difference between single element and twin element?

A single element system has one heating element and is commonly used for standard electric storage replacement. A twin element system has two heating elements and can provide faster recovery and additional hot water support during peak demand periods, where the electrical setup and tariff arrangement are suitable.

What element sizes are available?

The Rinnai Hotflo 400L lists 3.6kW and 4.8kW heating element options.

What is the tank lining?

The Rinnai Hotflo 400L uses a vitreous enamel lined steel tank.

Does the Rinnai Hotflo 400L have an anode?

Yes. The Rinnai Hotflo 400L includes inbuilt anode protection to help extend the life of the hot water tank.

What is the relief valve setting?

The Rinnai Hotflo 400L has a listed 1000 kPa relief valve setting.

What is the expansion control setting?

The Rinnai Hotflo 400L has a listed 850 kPa expansion control setting.

What is the maximum water supply pressure?

The Rinnai Hotflo 400L lists 680 kPa maximum water supply pressure with an expansion control valve and 800 kPa maximum water supply pressure without an expansion control valve.

What are the dimensions?

The Rinnai Hotflo 400L has an overall height of 1840mm and a tank diameter of 675mm.

How much does the Rinnai Hotflo 400L weigh?

The Rinnai Hotflo 400L has an empty weight of 96kg.

What is the IP rating?

The Rinnai Hotflo 400L has an IPX4 ingress protection rating.

What is the warranty on the Rinnai Hotflo 400L?

The Rinnai Hotflo 400L is listed with a 10-year cylinder warranty, subject to Rinnai warranty terms and conditions.

Is the Rinnai Hotflo 400L good for replacing an old electric hot water system?

Yes. The Rinnai Hotflo 400L can be a strong replacement option for selected large electric storage hot water systems, provided the existing location, plumbing, electrical supply, water pressure, access and household hot water demand suit a 400L-class electric storage water heater.

What is the difference between the Rinnai Hotflo 315L and 400L?

The Rinnai Hotflo 400L provides more stored hot water than the 315L model and is better suited to very large families, shared households or homes with very high daily hot water use. The 315L model may suit larger households that still need strong capacity but do not require the largest Hotflo electric storage option.

* Requested element size may come delivered separately to system for electric systems - All units supplied with factory with 3.6kW

**Where a unit supplied is capable of supplying more than 50°C, a tempering valve must be installed on the property or purchased as part of a valve kit with your order.

Hassle-Free Installation – Done Right by Trusted Experts

Need professional installation? We’ve got you covered! Our optional installation service connects you with our network of certified, trusted contractors, ensuring a smooth and stress-free setup.

How It Works:

🔹 Step 1: Select Installation Service
Choose to include professional installation when purchasing your new system.

🔹 Step 2: Pay for Installation Upfront
Simply add the installation service prior to adding your product to cart —no hidden fees, no surprises.

🔹 Step 3: We Assign a Certified Contractor
We’ll match you with a licensed, experienced contractor from our network to handle the installation.

🔹 Step 4: Schedule Your Installation
The assigned contractor will contact you directly to arrange a convenient time for installation.

🔹 Step 5: Direct Support When You Need It
For any installation-related questions, your contractor is your first point of contact. If any issues arise, our team is here to help.

🚨 Please Note: Installed Today supplies the product and connects you with a certified contractor for installation.

We’re committed to delivering top-quality products and facilitating a seamless installation experience. Have product questions? Reach out to us anytime! 🔥

Buying a new hot water system, water filter, pump or plumbing product should be simple. Installed Today helps you compare the product, the supply-only price and the available installation options in one place, so you can choose what suits your home, budget and timing without the back and forth.

Whether you already know exactly what you need or you are still comparing options, we make it easier to order with confidence.

Why Customers Choose Installed Today

Supply Only or Installed Options

Choose the product on its own, or add installation where available. This gives you the flexibility to buy the way that suits you best.

Clear Pricing Before Checkout

See your product price upfront, then add the installation options or common extras you need before placing your order. No confusing quote forms just to understand your starting price.

Product Details That Actually Help

Key specs, sizing details, warranty information, product features and suitability notes are shown clearly, so you can compare products properly before you buy.

Installation Add-Ons Available

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

Built Around Brisbane and Gold Coast Homes

Our product and installation options are selected with common local homes, water quality, plumbing layouts, access issues and replacement requirements in mind.

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

Practical Help Before You Buy

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Designed To Make Your Decision Easier

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

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Choose supply only if you just need the product.

Choose supplied and installed if you want the product installed where available.

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

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

Important Note

Installation availability, inclusions and add-ons vary by product type, site access, existing services, selected options and your property requirements. Some installations may require additional work, upgrades or checks before the job can proceed.

Fast & Reliable Delivery – What to Expect

Same Day Delivery: Available in Brisbane and Gold Coast on select units ordered before 8:00am
Express Delivery: 1–4 business days
Standard Delivery: 2–8 business days

Same Day Delivery

Same day delivery is available for selected hot water systems in Brisbane and Gold Coast metro areas when ordered before 8:00am, subject to stock availability, delivery capacity and suitable transport conditions.

Fast Metro Delivery

Most hot water orders in metro areas are delivered quickly, with around 90% arriving within 1 business day.

Weather Delays

Hot water systems cannot always be transported safely by courier during rain. Delivery timeframes may be affected when wet weather impacts safe handling, loading, unloading or transport conditions.

Express Delivery Guarantee

If your express delivery order takes longer than 1–4 business days, we will adjust the delivery timeframe to our standard 2–8 business days and refund your express shipping charge automatically.

Order Tracking

We will send your delivery details as soon as your order has been dispatched.

Need help with your delivery? Contact our team and we’ll be happy to assist.