Best Rheem Hot Water Systems: Complete Buyer’s Guide

Rheem is one of the most searched hot water brands in Australia, with buyers often comparing Rheem electric, gas, instant gas, heat pump and replacement hot water options before ordering online. The best Rheem hot water system depends on your household size, number of bathrooms, energy source, available space, current system type, budget and whether the selected model suits your property.

At Hot Water Outlet, you can compare Rheem hot water systems, hot water systems, electric hot water systems, gas hot water systems, instant gas hot water systems, heat pump hot water systems and common valves, pipework and fittings.

Quick Answer: Which Rheem Hot Water System Is Best?

The best Rheem hot water system is the one that matches your home’s energy source, hot water demand, available space and replacement requirements.

As a general guide:

• Choose a Rheem electric storage system if your home already has electric storage and you want a practical like-for-like replacement.

• Choose a Rheem gas system if your home has natural gas or LPG and gas hot water suits the household.

• Choose a Rheem instant gas system if you want continuous flow hot water and the property has suitable gas supply, water pressure and external wall space.

• Choose a Rheem heat pump if you want efficient electric hot water and the property has suitable outdoor space, airflow, drainage and electrical requirements.

• Compare tank capacity for storage systems.

• Compare flow rate in L/min for instant gas systems.

• Confirm natural gas or LPG before ordering any gas model.

• Check product dimensions, connection positions, warranty information and required valves before buying.

Rheem is a broad hot water brand, so the right decision is not just “which Rheem is best?” It is “which Rheem system type and size suits my home?”

Rheem Hot Water Systems at a Glance

The best Rheem option depends on system type first, then size, then model.

Start With Your Current Hot Water System

Before choosing a Rheem hot water system, check what you already have.

Look for:

• Current brand and model

• System type

• Tank capacity in litres

• Flow rate in L/min if instant gas

• Natural gas or LPG if gas

• Power requirements if electric

• Indoor or outdoor location

• Product dimensions

• Connection positions

• Whether the current system keeps up

• Whether the household size has changed

If the current system has worked well, a similar Rheem system type and size may be a practical replacement.

If the current system runs out, struggles with demand or no longer suits the home, compare other Rheem sizes and system types before ordering.

Rheem Electric Hot Water Systems

Rheem electric hot water systems may suit homes that already use electric storage or do not have gas available.

Electric storage systems heat and store hot water in a tank. They are sized by tank capacity in litres.

A Rheem electric system may suit:

• Units

• Townhouses

• Small homes

• Rental properties

• Homes without natural gas

• Like-for-like electric storage replacements

• Properties where a storage tank is already installed

• Buyers wanting a practical storage-style system

Before choosing a Rheem electric storage system, check:

• Tank capacity

• Current tank size

• Whether the current system runs out

• Number of people in the home

• Number of bathrooms

• Power requirements

• Indoor or outdoor suitability

• Product dimensions

• Connection positions

• Required valves and fittings

A small electric tank may suit low-demand homes. Larger households, families and two-bathroom homes usually need more careful sizing.

Rheem Gas Hot Water Systems

Rheem gas hot water systems may suit homes with natural gas or LPG where gas hot water is already installed or preferred.

Gas hot water may include storage-style systems or instant gas systems, depending on the product.

A Rheem gas system may suit:

• Homes already using gas hot water

• Natural gas properties

• LPG properties

• Families with higher hot water demand

• Homes wanting faster recovery than some electric storage options

• Buyers replacing an old gas storage or gas continuous flow system

Before choosing a Rheem gas system, check:

• Natural gas or LPG

• Gas storage or instant gas system type

• Tank capacity if storage

• Recovery rate if storage

• Flow rate in L/min if instant gas

• Gas supply suitability

• Water pressure and flow

• Number of bathrooms

• Product dimensions

• Required valves and fittings

Natural gas and LPG models are not interchangeable. Always confirm the correct gas type before ordering.

Rheem Instant Gas Hot Water Systems

Rheem instant gas hot water systems heat water as it passes through the unit. They do not store a large tank of hot water.

Instant gas systems are sized by flow rate in L/min.

A Rheem instant gas system may suit:

• Homes with natural gas or LPG

• Properties wanting continuous flow hot water

• Homes where a large storage tank is not preferred

• Families with suitable gas supply and water pressure

• Two-bathroom homes where a correctly sized unit is selected

• Buyers replacing an old continuous flow gas unit

When comparing Rheem instant gas systems, check:

• Flow rate in L/min

• Natural gas or LPG

• Number of people in the home

• Number of bathrooms

• Whether two showers may run close together

• Bath use

• Gas supply suitability

• Water pressure and flow

• External wall location

• Controller compatibility

• Product dimensions

• Required valves and fittings

A lower-flow unit may suit smaller homes. Larger homes, families and two-bathroom properties may need a higher-flow option, subject to gas supply and water pressure.

Rheem Heat Pump Hot Water Systems

Rheem heat pump hot water systems may suit homes wanting efficient electric hot water where the location is suitable.

Heat pump systems use electricity and surrounding air to heat stored water. They are storage systems, so tank capacity still matters.

A Rheem heat pump may suit:

• Homes replacing electric storage

• Properties without natural gas

• Homes wanting efficient electric hot water

• Solar homes where the setup is suitable

• Larger households where the selected tank capacity matches demand

• Properties with suitable outdoor space and airflow

Before choosing a Rheem heat pump, check:

• Tank capacity

• Outdoor location

• Airflow around the unit

• Condensate drainage

• Noise placement

• Electrical requirements

• Product dimensions

• Delivery access

• Warranty information

• Required valves and fittings

A Rheem heat pump should not be chosen by brand alone. The property needs suitable airflow, drainage, space and electrical conditions.

Rheem Storage vs Rheem Instant Gas

One of the biggest Rheem buying decisions is whether to choose storage hot water or instant gas hot water.

Storage systems are sized by tank capacity. Instant gas systems are sized by L/min.

Do not compare a Rheem 250L storage tank and a Rheem 26L instant gas system as if the litres mean the same thing. They measure different things.

Rheem Electric vs Rheem Heat Pump

Rheem electric storage and Rheem heat pump systems both use electricity, but they suit different situations.

Rheem electric storage may suit if:

• You want a practical like-for-like replacement

• The current electric tank location works

• Outdoor airflow is limited

• Noise placement is difficult

• Upfront product cost is a key factor

• A straightforward storage tank is preferred

Rheem heat pump may suit if:

• Outdoor space is suitable

• Airflow around the unit is available

• Condensate drainage can be managed

• Noise placement works

• Electrical requirements can be confirmed

• Efficient electric hot water is preferred

Heat pump hot water can be a strong option for the right property, but it is not automatically the best choice for every home.

Rheem Gas Storage vs Rheem Instant Gas

Rheem gas storage and Rheem instant gas are both gas hot water options, but they operate differently.

Rheem gas storage may suit if:

• You are replacing an existing gas storage system

• Tank-style hot water is preferred

• The current system has worked well

• Recovery rate suits household demand

• The product fits the current location

Rheem instant gas may suit if:

• Continuous flow hot water is preferred

• External wall space is available

• Natural gas or LPG is confirmed

• Gas supply can support the selected unit

• Water pressure and flow are suitable

• A correctly sized L/min model is selected

If changing from gas storage to instant gas, licensed tradespeople should confirm gas supply, water pressure, clearances, connection changes and compliance requirements.

Best Rheem Hot Water System for One Bathroom

A one-bathroom home may suit several Rheem options depending on energy source and usage.

A Rheem electric storage system may suit if:

• The home already has electric storage

• Gas is not available

• A compact or medium tank suits demand

• A straightforward replacement is preferred

A Rheem gas or instant gas system may suit if:

• Natural gas or LPG is available

• Gas hot water is preferred

• The selected flow rate suits household demand

• Gas supply and water pressure are suitable

A Rheem heat pump may suit if:

• Outdoor space and airflow are suitable

• Tank capacity suits the household

• Noise and drainage can be managed

• Electrical requirements can be confirmed

One bathroom does not always mean low demand. A one-bathroom family home can use more hot water than a two-bathroom home with fewer occupants.

Best Rheem Hot Water System for Two Bathrooms

Two-bathroom homes need more careful sizing because showers and outlets may overlap.

A Rheem storage system may suit if:

• Tank capacity is large enough

• Recovery rate suits household demand

• The current storage location works

• The home prefers a tank-style system

A Rheem instant gas system may suit if:

• A suitable L/min flow rate is selected

• Natural gas or LPG is confirmed

• Gas supply can support the selected unit

• Water pressure is suitable

• Two bathrooms may be used close together

A Rheem heat pump may suit if:

• Tank capacity is suitable

• Outdoor airflow is available

• Noise placement works

• Electrical requirements can be met

For two bathrooms, sizing matters more than brand preference.

Best Rheem Hot Water System for Families

Families usually have higher hot water demand, especially during morning and evening peaks.

A Rheem system for a family should be selected based on:

• Number of people

• Number of bathrooms

• Shower duration

• Back-to-back showers

• Bath use

• Kitchen hot water use

• Laundry use

• Energy source

• Space available

• Current system performance

Rheem electric storage may suit families where a larger tank is practical.

Rheem gas or instant gas may suit families where natural gas or LPG is available and the property can support the selected system.

Rheem heat pump may suit families where outdoor location, tank capacity and electrical requirements line up.

Avoid choosing the smallest Rheem model just to reduce upfront cost. An undersized system can be frustrating and may not suit family use.

Best Rheem Hot Water System for Small Homes

Small homes may suit compact or medium Rheem systems depending on demand.

Rheem electric storage may suit if:

• Gas is not available

• A tank-style system is already installed

• The household has low to moderate demand

• The unit fits the available location

Rheem instant gas may suit if:

• Gas is available

• External wall space is suitable

• Flow rate matches demand

• A storage tank is not preferred

Rheem heat pump may suit if:

• Outdoor space is available

• Airflow is not restricted

• Noise placement is acceptable

• Tank capacity matches the household

Small homes still need correct sizing. Do not assume the smallest model is automatically right.

Best Rheem Hot Water System for Units

Units often have space limits, access issues and building rules.

Rheem electric storage may suit units if:

• Electric storage is already installed

• A compact or medium tank fits

• Building rules allow the replacement

• A straightforward like-for-like option is preferred

Rheem gas may suit units if:

• The building already supports gas hot water

• Natural gas or LPG is confirmed

• External location requirements can be met

• Body corporate rules allow the system

Rheem heat pump may be harder in some units unless there is suitable outdoor space, airflow, drainage and noise placement.

For units, check building rules before ordering supply-only.

Best Rheem Hot Water System for Townhouses

Townhouses can suit Rheem electric, gas, instant gas or heat pump systems depending on layout.

Important checks include:

• Garage or courtyard space

• Side access

• Existing system type

• Gas availability

• Outdoor airflow

• Noise placement

• Condensate drainage

• Body corporate or complex rules

• Product dimensions

• Delivery access

Rheem electric storage may suit straightforward tank replacements.

Rheem instant gas may suit gas-connected townhouses with suitable external wall space.

Rheem heat pump may suit townhouses with enough airflow, drainage and acceptable noise placement.

Best Rheem Hot Water System for Rental Properties

Rental properties need practical hot water systems that suit likely tenant demand.

Rheem electric storage may suit rentals if:

• Electric storage is already installed

• A tank-style system is preferred

• The selected tank capacity suits likely tenants

• A straightforward replacement is useful

Rheem gas may suit rentals if:

• Gas hot water is already installed

• Natural gas or LPG is confirmed

• The replacement model suits the property

• Gas supply and water pressure are suitable

Rheem heat pump may suit rentals if:

• Outdoor location is suitable

• Noise is unlikely to create complaints

• Tank capacity suits likely tenant use

• Electrical requirements can be confirmed

Avoid undersizing rental hot water. A cheaper system is not good value if tenants regularly run out.

Best Rheem Hot Water System for Renovations

Renovations are a good time to reassess hot water because demand and layout may change.

A renovation may need a different Rheem system if:

• A second bathroom is being added

• More occupants will use the home

• A bath is being added

• The old system location is changing

• Gas availability is changing

• Solar or electrical setup is being updated

• Outdoor space is being redesigned

Plan the Rheem hot water system around the finished home, not the old layout.

Rheem Natural Gas vs LPG Systems

If you are choosing Rheem gas hot water, gas type must be confirmed before ordering.

Gas models may be:

• Natural gas

• LPG

Natural gas and LPG systems are not interchangeable.

Before ordering, check:

• Existing hot water unit label

• Gas meter

• LPG bottle setup

• Product listing

• Appliance data plate

• Licensed gas fitter advice if unsure

Choosing the wrong gas type can cause delays, compatibility issues and extra costs.

Rheem Flow Rate for Instant Gas

Rheem instant gas systems are sized by flow rate in L/min.

A higher L/min rating may suit higher demand, but only if the property can support it.

Rheem Tank Capacity for Storage Systems

Rheem storage systems are sized by tank capacity in litres.

Before choosing a tank size, check:

• Current tank size

• Whether the current system runs out

• Number of occupants

• Number of bathrooms

• Shower habits

• Bath use

• Kitchen use

• Laundry use

• Recovery rate

• Energy source

• Available space

Replacing with the same tank size can work if the old system suited the home. If it ran out, compare other sizes.

Rheem Heat Pump Location Checklist

Before choosing a Rheem heat pump, check the proposed location carefully.

A suitable location should allow for:

• Outdoor air movement

• Clearance around the system

• Condensate drainage

• Access for licensed tradespeople

• Acceptable noise placement

• Suitable electrical connection

• Safe delivery access

• Product dimensions

• Compliance with product requirements

Heat pump hot water is not just a product choice. It is a site suitability decision.

Rheem Warranty Information

Warranty terms vary by product type, model, component and installation conditions.

Before choosing a Rheem hot water system based on warranty, check:

• Product warranty details

• Cylinder or heat exchanger warranty where relevant

• Parts or labour terms where relevant

• Installation requirements

• Servicing requirements

• Exclusions

• Domestic or commercial use conditions

• Whether licensed installation is required

Do not assume every Rheem product has the same warranty. Check the specific model.

Rheem Supply-Only Pricing vs Installed Cost

When comparing Rheem hot water systems online, make sure you understand what the price includes.

Hot Water Outlet sells supply-only hot water systems and accessories online. Supply-only pricing usually does not include:

• Installation

• Plumbing labour

• Gas fitting

• Electrical work

• Old unit removal

• Disposal

• Valves

• Fittings

• Pipework changes

• Drainage work

• Switchboard upgrades

• Gas upgrades

• Compliance upgrades

• Concrete bases or platforms

• Delivery beyond what is shown at checkout

Before ordering, confirm full job requirements with licensed tradespeople.

Rheem Valves, Fittings and Accessories

A Rheem hot water order may need valves, fittings or accessories as well as the main unit.

Common items include:

• Tempering valves

• Pressure relief valves

• Duo valves

• Non-return valves

• Isolation valves

• Copper pipework

• Fittings

• Controllers for compatible instant gas systems

• Drainage parts for heat pumps

• Connection parts

Hot Water Outlet has a dedicated range of valves, pipework and fittings to help customers compare common hot water accessories.

Always confirm compatibility before ordering.

Common Mistakes When Buying a Rheem Hot Water System

Choosing Brand Before System Type

Rheem has different system types. Choose electric, gas, instant gas or heat pump before choosing the exact model.

Choosing the Same Size Without Checking Demand

The old system size may not suit if the household has changed or the old system ran out.

Confusing Storage Litres With Instant Gas L/min

A storage tank’s litres and an instant gas unit’s L/min rating are not the same thing.

Forgetting Natural Gas vs LPG

Gas type must be correct. Natural gas and LPG models are not interchangeable.

Ignoring Heat Pump Location

A Rheem heat pump needs outdoor airflow, drainage and suitable noise placement.

Comparing Supply-Only Price to Installed Cost

Supply-only product pricing is not the same as full installed cost.

Forgetting Valves and Fittings

The hot water unit may not be the full order. Accessories may also be required.

Choosing Only by Upfront Price

The cheapest Rheem system is not the best choice if it is undersized, unsuitable or missing required compatibility.

Rheem Buyer Checklist

Before choosing a Rheem hot water system, check:

• Current hot water system type

• Current brand and model

• Current tank capacity or flow rate

• Whether the current system keeps up

• Electricity, natural gas or LPG

• Number of people in the home

• Number of bathrooms

• Shower habits

• Bath use

• Desired system type

• Tank capacity if storage

• Recovery rate if storage

• Flow rate in L/min if instant gas

• Gas supply suitability

• Water pressure and flow

• Heat pump outdoor location

• Heat pump airflow

• Heat pump noise placement

• Condensate drainage

• Electrical requirements

• Product dimensions

• Connection positions

• Delivery access

• Required valves and fittings

• Warranty information

Compare Rheem Hot Water Systems Online

Hot Water Outlet makes it easier to compare Rheem hot water systems by system type, size, gas type, product dimensions and specifications.

Start with:

• Rheem Hot Water Systems

• Hot Water Systems

• Electric Hot Water Systems

• Gas Hot Water Systems

• Instant Gas Hot Water Systems

• Heat Pump Hot Water Systems

• Valves, Pipework and Fittings

If a Rheem product is not the best match for your home, compare other brands such as Rinnai hot water systems, Dux hot water systems, Bosch hot water systems, Vulcan hot water systems, iStore hot water systems, Stiebel Eltron hot water systems, Envirosun hot water systems and Emerald Energy hot water systems.

FAQs About Rheem Hot Water Systems

Are Rheem hot water systems good?

Rheem hot water systems are widely compared by Australian buyers because the brand covers several hot water categories. The best Rheem system depends on your home’s energy source, household demand, size requirements and installation location.

Which Rheem hot water system is best?

The best Rheem hot water system is the one that suits your home. Electric storage may suit some homes, gas may suit others, instant gas may suit continuous flow demand, and heat pump may suit properties with suitable outdoor space and airflow.

Is Rheem electric hot water better than Rheem gas?

Neither is automatically better. Rheem electric may suit homes without gas or straightforward electric storage replacements. Rheem gas may suit homes with natural gas or LPG where gas hot water is preferred.

Is Rheem instant gas better than Rheem gas storage?

Rheem instant gas may suit homes wanting continuous flow hot water with suitable gas supply and water pressure. Rheem gas storage may suit homes wanting a traditional tank-style gas replacement.

Is Rheem heat pump better than Rheem electric storage?

A Rheem heat pump may suit homes with suitable outdoor space, airflow, drainage and electrical requirements. Rheem electric storage may be more practical where a simple like-for-like tank replacement is preferred.

What size Rheem hot water system do I need?

The right size depends on the number of people in the home, number of bathrooms, shower habits, bath use, energy source and current system performance. Storage systems use tank capacity in litres. Instant gas systems use flow rate in L/min.

Can I replace my old Rheem with another Rheem?

Yes, if a suitable replacement model is available and the size, system type, dimensions, connections and energy source suit the home. Still compare demand before ordering the same size again.

Are Rheem gas systems natural gas or LPG?

Rheem gas models may be available in natural gas or LPG versions depending on the product. Natural gas and LPG are not interchangeable, so always order the correct model.

Do Rheem systems need valves and fittings?

Some Rheem replacements require valves, fittings or accessories depending on system type, pressure rating and connection layout. Browse valves, pipework and fittings and confirm compatibility before ordering.

Can I install a Rheem hot water system myself?

No. Hot water systems involve plumbing, gas and electrical work that should be completed by appropriately licensed tradespeople. Hot Water Outlet sells supply-only hot water systems and accessories online, and may help organise quotes from reputable installers where appropriate.

Find the Right Rheem Hot Water System

The best Rheem hot water system depends on your current setup, household demand, energy source, available space and replacement requirements. Rheem electric storage may suit practical tank replacements. Rheem gas may suit homes with natural gas or LPG. Rheem instant gas may suit continuous flow needs. Rheem heat pump may suit efficient electric hot water where the location is suitable.

Browse Rheem hot water systems online with Hot Water Outlet to compare Rheem hot water options by system type, size, gas type and product specifications.