Rinnai Hotflo Electric Hot Water System Review: Is It a Reliable Long-Term Investment?

Apr 17, 2023

The Rinnai Hotflo electric hot water system is a popular choice for Australian homes looking for a straightforward electric storage replacement. It suits households that want stored hot water, familiar brand backing, simple operation and a wide range of tank sizes.

But the best hot water system is not just the one with the lowest product price or the biggest brand name. Long-term reliability depends on the right tank size, water quality, installation location, electrical setup, valves, maintenance, pressure conditions and whether the system is installed correctly by a licensed professional.

This Rinnai Hotflo review explains where Rinnai electric hot water systems can make sense, what to check before ordering, and when it may be worth comparing alternatives such as heat pump hot water or other electric storage brands.

You can compare Rinnai Hot Water Systems, Electric Hot Water Systems, Heat Pump Hot Water Systems and all Hot Water Systems online with Installed Today.

Quick answer: is the Rinnai Hotflo electric hot water system worth considering?

A Rinnai Hotflo electric hot water system can be worth considering if you want a practical electric storage unit for a like-for-like replacement, especially where the home already has an electric storage hot water system.

It may suit:

Homes replacing an old electric storage tank
Units and townhouses
Small to medium households
Larger family homes with the right tank size
Rental properties
Homes without natural gas or LPG
Customers wanting a simple stored hot water system
Customers with their own licensed installer arranged
Eligible Brisbane and Gold Coast customers where supplied-and-installed options are available

It may not be the best option if you want the lowest possible running costs, if your home is suitable for heat pump hot water, or if the existing electric system was undersized and regularly ran out of hot water.

What is a Rinnai Hotflo electric hot water system?

The Rinnai Hotflo range is an electric storage hot water system range. It heats water in a storage tank and keeps it ready for use throughout the day.

Unlike instant gas hot water, an electric storage system does not heat water only as it passes through the unit. It stores a fixed amount of hot water, which means tank size matters.

A Rinnai electric storage system may be chosen for:

Simple like-for-like electric replacement
Stored hot water
Homes without gas
Apartments and units
Townhouses
Rental properties
Family homes
Supply-only ordering
Selected installed options where available

For many households, the appeal is simplicity. Electric storage hot water is familiar, widely used and often easier to replace than changing to a completely different hot water type.

Rinnai Hotflo pros

Rinnai electric storage hot water systems have several practical advantages when correctly selected.

Potential benefits include:

Familiar Rinnai brand
Simple electric storage operation
Multiple tank sizes
Practical for like-for-like replacement
Suitable for many homes without gas
Can suit off-peak or controlled-load setups where applicable
Stored hot water ready for household use
Indoor or outdoor suitability depending on the model
Supply-only ordering available where you have your own licensed installer
Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast areas

The strongest use case is usually replacing an existing electric storage system with the right size in a suitable location.

Rinnai Hotflo cons

Rinnai electric storage systems are not perfect for every home.

Potential drawbacks include:

Higher running costs than many heat pump systems
Can run out of hot water if undersized
Recovery time matters after heavy use
Storage tanks need correct pressure and valve setup
Long-term life depends on water quality and maintenance
Element, thermostat, valve or tank issues can occur over time
Installation extras can change the final cost
Not as compact as some instant gas systems
Not the same efficiency category as heat pump hot water
Warranty outcomes can depend on correct installation and documentation

A Rinnai electric system can be reliable, but only when the selected model suits the property and demand.

Rinnai Hotflo tank sizes

Rinnai electric hot water systems are available in different storage sizes. The right tank size depends on household use.

Common electric storage sizes include smaller compact units through to larger family-sized tanks.

Installed Today homepage-linked Rinnai electric products include:

Choosing the correct size is one of the most important parts of getting long-term satisfaction from an electric storage system.

Rinnai 125L electric hot water system review

A Rinnai 125L electric hot water system may suit smaller homes and lower-use households.

It may suit:

One to two people
Small units
Granny flats
Compact townhouses
Low hot water demand
Simple like-for-like replacement
Homes where space is limited

It may not suit:

Larger families
Long showers
Multiple bathrooms
High evening demand
Rental homes with changing occupancy
Airbnb properties with guest peaks

If the old 125L system regularly ran out of hot water, replacing it with another 125L tank may repeat the problem.

Rinnai 250L electric hot water system review

A Rinnai 250L electric hot water system is often compared for family homes and medium-demand households.

It may suit:

Small to medium families
One to two bathroom homes
Rental properties
Like-for-like electric storage replacement
Homes needing more capacity than 125L or 160L
Moderate daily hot water use

A 250L tank is often a practical middle-ground size, but it still needs to match the household’s shower habits and peak demand.

If the home has teenagers, multiple bathrooms, bath use or high back-to-back shower demand, compare whether 250L is enough before ordering.

Rinnai 315L electric hot water system review

A Rinnai 315L electric hot water system may suit larger households or homes where 250L may not provide enough stored hot water.

It may suit:

Larger families
Higher hot water demand
Multiple occupants
Some two-bathroom homes
Rental properties with higher likely usage
Homes where the old smaller tank struggled

Before choosing a 315L system, check:

Available space
Access for delivery
Base or stand condition
Electrical suitability
Pipework
Valve requirements
Whether the larger tank fits the existing location

Larger tanks can improve capacity, but they may also cost more to buy, heat and install.

Rinnai Hotflo for small homes

A smaller Rinnai electric storage system can suit a small home when hot water use is modest.

Good-fit situations include:

One or two occupants
One bathroom
Shorter showers
Low laundry hot water use
Limited space
Like-for-like replacement
No plans to increase household occupancy

For small homes, the key is not overspending on capacity you do not need while still avoiding an undersized tank.

Rinnai Hotflo for family homes

Family homes need more careful sizing.

Check:

Number of people
Number of bathrooms
Shower length
Back-to-back shower use
Bath use
Dishwasher use
Laundry use
Morning peak demand
Evening peak demand
Whether the old tank ran out
Whether off-peak heating applies

A family home should not choose a tank purely because it matches the old one. If the old system was not keeping up, compare a larger tank or a different hot water type.

Rinnai Hotflo for rental properties

Rinnai electric storage can suit rental properties where simplicity and reliability are important.

For rentals, consider:

Number of bedrooms
Number of bathrooms
Likely tenant occupancy
Ease of operation
Maintenance access
Warranty terms
Product availability
Replacement cost
Installation simplicity
Whether the system is large enough for future tenants

A very small tank may save upfront but can create tenant complaints if the property is later occupied by more people.

Rinnai Hotflo for Airbnb and short-stay properties

Short-stay homes need reliable hot water for maximum guest occupancy.

A Rinnai electric storage system may suit some Airbnb properties, but sizing is critical.

Check:

Guest capacity
Number of showers
Back-to-back shower demand
Bath use
Laundry turnover between stays
Recovery time
Peak morning usage
Peak evening usage
Ease of operation
Maintenance access

For short-stay properties, guest comfort should come before the lowest upfront price.

Rinnai Hotflo energy efficiency

Electric storage hot water systems are simple and reliable, but they are usually not the lowest running cost option.

Running costs depend on:

Tank size
Household usage
Electricity tariff
Off-peak or controlled-load setup
Timer settings
Water temperature settings
Insulation
Water quality
Hot water habits
Whether rooftop solar is used effectively

A Rinnai electric system can be practical where the home already has electric storage and wants a straightforward replacement. But if lowering long-term running costs is the main priority, compare Heat Pump Hot Water Systems.

Rinnai Hotflo and off-peak electricity

Some electric storage hot water systems are connected to off-peak or controlled-load tariffs. This can reduce running costs where the tariff setup suits the household.

Before relying on off-peak operation, check:

Existing meter setup
Controlled-load availability
Tank size
Whether the tank stores enough water for the day
Household shower timing
Whether boost heating is available
Electrical requirements
Installer advice

Off-peak can work well when the tank is correctly sized. If the tank is too small, the home may run out of hot water before the next heating cycle.

Rinnai Hotflo and solar power

Electric storage hot water can sometimes work with rooftop solar when the electrical setup and timer strategy suit.

A solar-friendly setup may involve heating water during the day while solar power is available.

However, this depends on:

Solar system size
Timer setup
Electricity tariff
Existing hot water circuit
Tank size
Household usage
Installer advice
Whether the system needs off-peak or daytime heating

Do not assume every electric hot water system automatically uses solar power well. It needs the right electrical setup.

Rinnai Hotflo vs Rinnai heat pump

Rinnai electric storage and Rinnai heat pump hot water systems suit different buyers.

Feature	Rinnai electric storage	Rinnai heat pump
Upfront cost	Often lower	Usually higher
Running cost	Usually higher than heat pump	Often lower in suitable conditions
Installation	Often simpler like-for-like	More site-specific
Outdoor airflow	Not usually the same issue	Very important
Noise	Generally quiet	Fan and compressor noise
Drainage	Standard hot water discharge	Condensate drainage needed
Best suited to	Simple electric replacement	Efficiency-focused electric upgrade

A heat pump may be a better long-term option where the site suits. Electric storage may be better where the customer wants a simpler replacement and lower upfront cost.

Rinnai Hotflo vs gas hot water

Electric storage and gas hot water are very different.

Electric storage may suit:

Homes without gas
Existing electric storage replacements
Apartments and units
Customers wanting stored hot water
Homes with off-peak electricity

Gas hot water may suit:

Homes already set up for natural gas or LPG
Customers wanting continuous flow gas hot water
Properties with suitable gas pipe sizing
Homes with the right outdoor installation location

Natural gas and LPG are not interchangeable. Any gas system must match the property’s gas type and be installed by a licensed gas fitter.

Rinnai Hotflo vs Rheem electric hot water

Rinnai and Rheem are both familiar hot water brands. The better choice depends on the exact model, tank size, warranty terms, dimensions and installation requirements.

When comparing Rinnai with Rheem Hot Water Systems, check:

Tank size
Cylinder material
Warranty terms
Element rating
Connection positions
Dimensions
Product price
Installation requirements
Availability
Household suitability

For example, the homepage-linked Rheem STELLAR 250L Electric Hot Water System may be worth comparing against a 250L Rinnai electric system if the home suits that capacity.

Rinnai Hotflo vs Dux electric hot water

Rinnai and Dux are commonly compared for electric storage replacement.

When comparing Rinnai with Dux Hot Water Systems, check:

Tank size
Price
Warranty terms
Dimensions
Connection positions
Existing system type
Installation extras
Product availability
Household demand

Do not choose by brand alone. Compare the exact model against the home’s hot water demand and installation setup.

Is Rinnai Hotflo reliable long term?

A Rinnai Hotflo electric hot water system can be a reliable long-term choice when correctly sized, installed and maintained.

Reliability depends on:

Correct tank size
Correct installation
Licensed plumbing and electrical work
Water pressure
Valve setup
Water quality
Anode condition where applicable
Electrical supply
Maintenance
Usage pattern
Site conditions
Warranty documentation

No storage tank is immune to age, corrosion, valve wear, thermostat faults, element issues or leaks over time. Long-term reliability is as much about correct selection and installation as it is about brand.

Common Rinnai electric hot water problems to watch for

Potential issues with electric storage hot water systems can include:

No hot water
Lukewarm water
Running out of hot water
Thermostat faults
Element failure
Relief valve discharge
Leaking valves
Tank leaks
Rust-coloured water
High electricity use
Slow recovery
Tripped circuit breaker

These issues are not unique to Rinnai. They can occur across electric storage systems when components age, the system is undersized, water quality is poor, or maintenance has been ignored.

What causes an electric hot water tank to leak?

Leaks can come from different places.

Possible leak sources include:

Relief valve
Tempering valve
Pipe connection
Drain line
Tank fittings
Element seal
Cylinder corrosion
Condensation mistaken for a leak
Overflow discharge
Pipework above or near the system

A leaking valve is different from a leaking cylinder. If the cylinder itself is leaking, replacement is usually required.

Do not ignore a leak. Have a licensed professional inspect the system.

What causes no hot water in a Rinnai electric system?

No hot water may be caused by:

Tripped circuit breaker
Off-peak supply timing
Faulty thermostat
Failed heating element
Electrical fault
Safety cut-out
Incorrect settings
Undersized tank after heavy usage
Wiring or supply issue

Electrical testing should be handled by a licensed electrician or qualified professional.

What causes running out of hot water?

Running out of hot water is often a sizing or usage issue.

Possible causes include:

Tank too small
More people in the home
Longer showers
Back-to-back showering
Bath use
Off-peak tank not reheating during the day
Faulty element
Thermostat issue
Tempering valve issue
Increased household demand
Sediment or scale issues

If the system has always run out, it may be undersized. If it suddenly started running out, it may need inspection.

Maintenance and lifespan

Electric storage hot water systems need periodic checks.

Maintenance may include:

Relief valve testing
Tempering valve checks
Anode inspection or replacement where applicable
Leak inspection
Electrical component checks
Pipework inspection
Drain line checks
Water pressure checks
General system condition checks

Maintenance requirements depend on the product, water quality and manufacturer instructions.

Hard water, high pressure, poor installation, lack of maintenance and age can all reduce system life.

Warranty considerations

Before ordering a Rinnai Hotflo system, check warranty terms carefully.

Review:

Cylinder warranty
Parts warranty
Labour coverage
Installation requirements
Licensed installer requirements
Maintenance requirements
Water quality exclusions
Pressure requirements
Proof of purchase
Service process
What is and is not covered

Warranty coverage does not usually mean every issue is covered automatically. Incorrect installation, water quality, pressure problems or missing documentation can affect claims.

Installation considerations

A Rinnai electric hot water system should be installed by the right licensed professional.

Important checks include:

Existing system size
Existing energy source
Indoor or outdoor location
Access
Dimensions
Connection positions
Base or stand condition
Drainage
Relief valve discharge
Tempering valve requirements
Pressure limiting valve requirements
Electrical supply
Circuit suitability
Old unit removal
Disposal
Compliance upgrades

The same tank can be a simple replacement in one home and a more complex installation in another.

Supply-only Rinnai Hotflo systems

Supply-only ordering can suit customers who already have their own licensed installer arranged.

Supply only may suit:

Builders
Renovators
Property managers
Landlords
Trade customers
Customers managing their own installation
Customers outside supplied-and-installed service areas

Supply-only product pricing generally does not include installation, valves, old unit removal, disposal, electrical work, plumbing changes, drainage work, access upgrades or compliance upgrades unless clearly selected or included.

Before ordering supply only, your installer should confirm the Rinnai system suits the property.

Supplied-and-installed Rinnai electric hot water systems

Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast service areas where shown.

This can suit customers who want the product and installation pathway arranged together.

Before ordering supplied and installed, check:

Service area eligibility
Existing system type
Installation inclusions
Valve requirements
Electrical work
Drainage
Old unit removal
Disposal
Pipework changes
Access
Base or slab condition
Compliance upgrades
Product suitability

Do not assume every possible site requirement is included. Check the product page and selected options carefully.

Rinnai Hotflo for indoor installation

Some electric storage systems may be suitable for indoor installation depending on the model.

Indoor installations need careful attention to:

Safe tray requirements
Drainage
Overflow discharge
Access
Cupboard space
Ventilation where relevant
Leak risk
Electrical safety
Compliance requirements
Future service access

A tank installed inside a cupboard or apartment needs proper drainage and leak protection planning.

Rinnai Hotflo for outdoor installation

Outdoor installations are common for electric storage systems, but the location still matters.

Check:

Weather exposure
Stable base
Access
Clearance
Pipework
Electrical connection
Drainage
Relief valve discharge
Protection from impact
Future replacement access

Outdoor installation may be simpler than indoor installation in some homes, but it still needs to be compliant.

Common mistake: choosing the same size without checking demand

If the old system regularly ran out of hot water, choosing the same size may repeat the problem.

Hot water demand can increase when:

More people move in
Children become teenagers
A second bathroom is added
The home becomes a rental
The home becomes an Airbnb
Shower habits change
Laundry use increases

Replacement time is the right time to reassess tank size.

Common mistake: comparing only product price

The product price is not the total cost.

Extra costs may include:

Valves
Old unit removal
Disposal
Electrical work
Pipework changes
Drainage changes
Access issues
Base work
Compliance upgrades

Always compare the full replacement pathway, not only the unit price.

Common mistake: assuming electric storage is the cheapest long term

Electric storage can be affordable upfront, but it may not be the cheapest system to run.

If long-term running cost is a priority, compare heat pump hot water before ordering.

A heat pump may cost more upfront but can use less electricity in suitable conditions.

Common mistake: ignoring water quality

Water quality can affect storage tank life.

Hard water, aggressive water, high sediment or unusual chemistry can affect valves, tanks and components.

If your property has hard water, bore water, tank water or visible sediment, ask your installer whether water quality needs to be considered before ordering.

Common mistake: ignoring pressure and valves

High pressure and incorrect valve setup can affect system performance and lifespan.

A proper installation may require:

Pressure limiting valve
Tempering valve
Expansion control where required
Relief valve discharge
Correct pipe sizing
Safe drainage

Valve work should be assessed by a licensed professional.

Common mistake: DIY hot water installation

Hot water installation involves plumbing, electrical safety, pressure control and compliance.

DIY installation can create:

Leaks
Electric shock risk
Scalding risk
Warranty issues
Insurance problems
Non-compliant plumbing
System failure
Property damage

Use the right licensed professional.

Final verdict: should you buy the Rinnai Hotflo electric hot water system?

A Rinnai Hotflo electric hot water system can be a reliable long-term investment when it is correctly sized, professionally installed and matched to the home’s usage.

It is best suited to customers wanting a practical electric storage replacement, especially where the home already has electric storage hot water and the existing installation location suits the new tank.

It may not be the best choice if your main priority is the lowest running cost, if the home is suitable for heat pump hot water, or if your current electric system was undersized and struggled with household demand.

Before ordering, compare the exact Rinnai size against your household needs. Start with the Rinnai 125L Electric Hot Water System, Rinnai 250L Electric Hot Water System or Rinnai 315L Electric Hot Water System, or browse all Rinnai Hot Water Systems.

For customers comparing alternatives, review Electric Hot Water Systems, Heat Pump Hot Water Systems, Rheem Hot Water Systems and Dux Hot Water Systems.

Long-tail FAQs

Is the Rinnai Hotflo electric hot water system reliable?

It can be reliable when correctly sized, professionally installed and maintained. Long-term reliability depends on water quality, pressure, valves, electrical setup, usage and installation quality.

What size Rinnai Hotflo do I need?

The right size depends on the number of people, bathrooms, shower habits, bath use, laundry use and whether the old system ran out. Smaller homes may suit smaller tanks, while family homes often need 250L or larger.

Is the Rinnai Hotflo good for family homes?

Yes, it can suit family homes if the tank is correctly sized. A 250L or 315L electric storage system may suit many families, but demand should be checked before ordering.

Is Rinnai electric hot water cheaper to run than heat pump?

Usually, a heat pump can use less electricity in suitable conditions. Electric storage may be simpler and cheaper upfront, while heat pump hot water may offer lower running costs over time.

Can Rinnai Hotflo work with solar power?

Electric storage hot water can sometimes be timed to use rooftop solar, depending on the electrical setup, timer, tariff and household usage. Your installer should confirm the best setup.

Why does a Rinnai electric hot water system run out of hot water?

Common reasons include undersizing, increased household demand, long showers, off-peak heating limitations, faulty elements, thermostat issues or tempering valve problems.

What causes a Rinnai electric hot water system to leak?

Leaks may come from valves, pipe connections, discharge lines, fittings or the cylinder itself. A licensed professional should inspect the system to identify the source.

Is Rinnai better than Rheem electric hot water?

Rinnai and Rheem both offer electric hot water systems. The better choice depends on the exact model, tank size, warranty, installation location, dimensions, price and household demand.

Is Rinnai better than Dux electric hot water?

Rinnai and Dux should be compared by model, tank size, warranty, dimensions, connection positions, installation requirements and total cost. Brand alone should not decide the purchase.

Should I choose Rinnai Hotflo or a heat pump?

Choose Rinnai electric storage if you want a simple electric replacement and the running costs suit your home. Compare heat pump hot water if long-term energy use is a bigger priority and the site has suitable outdoor space, airflow and drainage.

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