Rheem Stellar 125L Stainless Steel Electric Hot Water System
4A1125 · 4A1125G4 1.8kW · 4A1125G7 3.6kW
Buy the Rheem Stellar 125L stainless steel electric storage water heater from Hot Water Outlet. Designed for smaller-household electric hot-water replacements, it offers 125L rated hot-water delivery, a premium stainless steel cylinder, no sacrificial anode and dual-handed cold-water connections. Product supply only, with selected metro delivery availability and independent licensed installation arranged separately.
About the Rheem Stellar 125L
Rheem Stellar 125L (4A1125) is a compact mains-pressure electric storage water heater with a stainless steel cylinder and stainless steel water fittings. The product’s no-anode design helps avoid regular sacrificial-anode replacement where local water chemistry is suitable.
Rheem’s current listing suggests up to four household members under its specific moderate-climate, seven-minute-shower and tariff assumptions. That is a selection guide rather than a promise of sufficient hot water for every four-person home. Daily use, incoming water temperature and the reheating window matter.
The 125L figure is the rated hot-water delivery, not a contradiction of the 135L storage capacity listed in Rheem’s May 2025 brochure. The 1.8kW and 3.6kW single-element versions need to match the approved electrical arrangement.
Eight Key Features of the Rheem Stellar 125L
125L rated delivery
Rheem specifies 125 litres of rated hot-water delivery for the single-element 4A1125 family.
135L physical storage
Rheem’s May 2025 domestic brochure lists 135 litres of actual stored-water capacity.
Stainless steel cylinder
Stainless steel cylinder and water fittings give a premium construction option where local water chemistry is suitable.
No sacrificial anode
The stainless steel tank does not need the sacrificial anode associated with many vitreous enamel storage heaters.
Two element ratings
Manufacturer-listed 1.8kW and 3.6kW single-element options allow selection for the approved electrical circuit.
Dual-handed cold inlet
Left and right cold-water inlet positions offer plumbing layout flexibility for compatible replacements.
Indoor or outdoor siting
Designed for compliant indoor or outdoor installations subject to access, drainage and local requirements.
12-year cylinder cover
Manufacturer warranty offers up to 12 years on eligible domestic cylinders, with labour limits after year three.
These are manufacturer-published characteristics of the 4A1125 model family. Element rating, included fittings and actual SKU must be confirmed for the product ordered.
Rheem 4A1125G4 vs 4A1125G7
Rheem lists two single-element versions of its Stellar 125L. Both are 125L rated-delivery stainless steel heaters; the primary orderable difference is the electrical heating element rating.
| Specification | 4A1125G4 | 4A1125G7 |
|---|---|---|
| Manufacturer-listed element | 1.8kW | 3.6kW |
| Model family | 4A1125 | 4A1125 |
| Element arrangement | Single | Single |
| Rated delivery | 125L | 125L |
| Physical storage | 135L (2025 brochure) | 135L (2025 brochure) |
| Primary construction | Stainless steel | Stainless steel |
| Installation | Indoor/outdoor where compliant | Indoor/outdoor where compliant |
| Selection advice | Confirm the lower-powered electrical circuit | Confirm circuit supports the higher element power |
Rheem Stellar 125L Technical Specifications
Manufacturer-published values from the 4A1125 specification, May 2025 brochure and October 2025 owner/installation guide. Document revisions and measurement conventions are identified where relevant.
| Specification | Manufacturer figure / qualification |
|---|---|
| Manufacturer | Rheem Australia |
| Product range | Stellar / Stainless Steel Electric |
| Model family | 4A1125 |
| Listed 1.8kW SKU | 4A1125G4 |
| Listed 3.6kW SKU | 4A1125G7 |
| Water heater type | Mains-pressure electric storage |
| Element arrangement | Single element |
| Element power options | 1.8kW or 3.6kW; depends on selected SKU |
| Rated hot-water delivery | 125L |
| Physical storage capacity | 135L (Rheem May 2025 domestic hot-water brochure) |
| Rheem household guidance | Up to 4 people under Rheem stated moderate-climate, 7-minute shower and tariff assumptions |
| Tank construction | Stainless steel |
| Water fittings | Stainless steel |
| Sacrificial anode | Not required |
| Country of manufacture | Australia |
| Installation position | Indoor or outdoor where compliant |
| Overall height A | 1295mm |
| Dimension B (body width) | 495mm |
| Dimension C, May 2025 brochure | 500mm |
| Dimension C, October 2025 guide | 485mm; published dimension-document difference |
| Front lower cold connection height E | 185mm |
| Cable-entry position above bottom F | 105mm |
| TPR valve height D | 920mm |
| Approximate packaged weight | 31kg |
| Hot-water outlet | At top of water heater |
| Cold-water inlet arrangement | Dual-handed left and right connections |
| Water connection size | Rp 3/4 |
| Temperature and pressure relief valve | 1400kPa |
| Expansion control valve nominal setting | 1200kPa |
| Maximum water supply pressure with ECV | 960kPa |
| Maximum water supply pressure without ECV | 1120kPa |
| Relative energy performance | 17% better than MEPS under Rheem comparison |
| Relative product weight claim | Up to 42% lighter under Rheem comparison; not a product weight specification |
| Electrical supply | Site/circuit and chosen element to be confirmed by licensed electrician |
| Electrical work | Licensed electrician required as applicable |
| Plumbing work | Licensed plumber required |
| Delivery coverage | Selected Brisbane, Gold Coast, Sydney and Melbourne areas; address-dependent |
| Product-only purchase | Yes; installation and ancillary work excluded |
| Independent installer quote assistance | May be requested after purchase in selected metro areas, subject to availability |
| Cylinder warranty — eligible single-family dwelling | 12 years; labour conditions vary by year |
| All components — all installations | 1 year parts and labour under manufacturer conditions |
| Cylinder in eligible home — years 2–3 | Cylinder repair/replacement including labour |
| Cylinder in eligible home — years 4–12 | Replacement cylinder only; installation and repair labour excluded |
| Manufacturer water-quality chloride limit | Over 250mg/L may exclude cylinder coverage |
| Manufacturer water-quality TDS limit | Over 600mg/L may exclude cylinder coverage |
| Manufacturer water-quality pH range | 6.0–9.5 inclusive for cylinder coverage |
| Manufacturer service guidance | Major service recommended during sixth year; failure to arrange may affect specified claims |
| Source document versions | May 2025 brochure; October 2025 owner / installation guide |
Important: the 500mm drawing dimension in Rheem’s May 2025 brochure differs from the 485mm C dimension shown in the October 2025 guide; the manufacturer’s standalone plumbers handbook shows 500mm. Do not use either alone as a substitute for measuring the installed unit, verifying clearances and consulting the latest drawing.
Buy the Rheem Stellar 125L Supply Only
Hot Water Outlet sells the Rheem Stellar 125L as a supply-only water heater. This is a product purchase, suitable when licensed plumbing and electrical trades are organised independently.
What the product-only order covers
- The selected 4A1125 stainless steel electric heater SKU.
- Delivery where available and confirmed for the destination.
- Applicable manufacturer information relating to the supplied model.
- Optional enquiry for independent licensed installer quotations after purchase in selected metro areas.
Not included in the supply-only price
- Installation labour, plumbing work or electrical work.
- Valves, tempering and pressure control devices unless the live listing expressly includes them.
- Old system removal, disconnection or disposal.
- Drains, safe trays, bases, pipe relocation and access work.
- Switchboard, circuit, compliance or other site-specific upgrades.
Is the Rheem Stellar 125L Right for Your Home?
A 125L stainless steel electric storage water heater can suit smaller homes, units, townhouses, granny flats and some rental dwellings where the actual hot-water demand and site dimensions match the model. It may be considered for compatible replacements of an existing smaller electric storage heater.
Situations worth considering
- A compact upright tank is preferred over a larger 160L or 250L design.
- The property has suitable water chemistry for stainless steel.
- You want a heater that does not require a sacrificial anode.
- Both plumbing and electrical trades can be arranged separately.
- A 1.8kW or 3.6kW single-element circuit suits the selected heater.
Confirm before purchasing
- Daily shower usage and available electrical heating windows.
- 1295mm tank height and appropriate clearance around pipework.
- The difference between the brochure and 2025 installation drawing dimensions.
- Incoming water pressure, relief valve discharge and tempering arrangements.
- Water chloride, total dissolved solids, pH and saturation index.
- Property access, safe base, removal route and electrical circuit capacity.
Model identification matters: Do not replace Rheem Stellar 4A1125 specifications with pressure settings or dimensions from other 125L electric heaters or the larger 250L/315L Stellar family.
Stainless Steel Water Quality Limits
Rheem specifically warns that its stainless steel electric water heaters are not suitable for all local water supplies. The manufacturer’s October 2025 owner and installation guide sets out water-chemistry values beyond which the warranty will not cover resultant faults to stated components.
| Water chemistry | October 2025 Rheem warranty guidance |
|---|---|
| Chloride above 250mg/L | Cylinder coverage excluded for related faults |
| Total dissolved solids above 600mg/L | Cylinder coverage excluded for related faults |
| pH below 6.0 or above 9.5 | Cylinder coverage excluded for related faults |
| Saturation Index below −1.0 | Cylinder and copper-sheathed element affected under guide |
| SI above +0.4 without ECV | Specified cylinder and TPR valve coverage affected |
| SI above +0.8 | Specified cylinder and standard-watt-density element coverage affected |
Water Pressure, Dual-Handed Fittings and Temperature Safety
Rheem lists Rp 3/4 water fittings and left- and right-hand cold-water inlets. The hot-water outlet is positioned at the top. For model 4A1125, the TPR valve rating is 1400kPa, and the manufacturer lists a 1200kPa expansion control valve where required.
| Water pressure / valve condition | Rheem 4A1125 figure |
|---|---|
| Temperature and pressure relief valve | 1400kPa |
| Expansion control valve nominal setting | 1200kPa |
| Maximum supply pressure with ECV | 960kPa |
| Maximum supply pressure without ECV | 1120kPa |
| Hot/cold connection size | Rp 3/4 |
Licensed plumbing trades must assess incoming supply pressure, select any necessary pressure controls, provide compliant relief-valve discharge drainage, and meet local plumbing and temperature-delivery requirements. Hot water stored in a cylinder can cause scalding; the correct temperature controls depend on the site and applicable standards.
Rheem Stellar 125L vs 160L vs 250L
Choose based on required hot-water delivery, storage volume, physical dimensions, energy tariff and electrical circuit—not solely the household-occupancy guideline.
| Stellar stainless steel model | 125L 4A1125 | 160L 4A1160 | 250L 4A1250 |
|---|---|---|---|
| Rated hot-water delivery | 125L | 160L | 250L |
| Physical storage, May 2025 | 135L | 165L | 270L |
| Overall height | 1295mm | 1615mm | 1440mm |
| Body width | 495mm | 495mm | 625mm |
| Available elements | 1.8 / 3.6kW | 2.4 / 3.6kW | 3.6 / 4.8kW |
| Cylinder material | Stainless steel | Stainless steel | Stainless steel |
| Sacrificial anode | No | No | No |
These are comparisons within Rheem’s stainless steel electric range; the 250L family is wider and uses different relief-valve and water-pressure specifications. Check the actual model documentation before ordering.
Rheem Stellar 125L Manufacturer Warranty
Rheem advertises a 12-year cylinder warranty and a 1-year parts-and-labour warranty. Its October 2025 guide identifies which warranty periods include labour, and specifies that extended cylinder cover is for a qualifying water heater installed in a single-family domestic dwelling.
| Coverage period | Manufacturer terms |
|---|---|
| Year 1 — all installations | Repair or replacement of eligible faulty components, including labour |
| Years 2 and 3 — eligible single-family domestic cylinder | Repair or replacement of the cylinder including labour |
| Years 4 to 12 — eligible single-family domestic cylinder | Replacement cylinder free of charge; installation and repair labour at owner cost |
| Other installation classifications | Do not assume years 2 to 12 apply; read the applicable warranty |
| Relevant warranty conditions | Original installation, water quality, qualified installation, servicing and applicable exclusions |
Rheem recommends a major service in the sixth year after installation and explains that the absence of this service may affect claims where the fault would have been detected and corrected. The warranty is in addition to any statutory rights under Australian Consumer Law.
Rheem Stellar 125L Delivery: Brisbane, Gold Coast, Sydney & Melbourne
Hot Water Outlet may deliver this product to selected metropolitan locations in Brisbane, the Gold Coast, Sydney and Melbourne. The delivery address, stock status, freight cost, access and timing must be checked with HWO before the order is accepted. The listed locations are service-area indications, not guarantees for every postcode.
BrisbaneGold CoastSydneyMelbourne
After purchasing, customers may request help obtaining independent licensed installation quotations in selected metro regions. That enquiry is separate from the product purchase and depends on local availability.
Before You Order the 4A1125
Rheem Stellar 125L FAQs
Answers are specific to the stainless steel Rheem Stellar 4A1125 family and HWO’s supply-only purchase model.
Can I buy the Rheem Stellar 125L supply only?
Yes. Hot Water Outlet supplies the Rheem Stellar 125L electric storage heater as a product-only purchase, with any delivery charge and address availability confirmed at checkout.
Does Hot Water Outlet install this hot water system?
No. Hot Water Outlet does not directly install water heaters or include installation in the supply-only product price.
Can HWO help me seek an independent installation quote?
After purchase, eligible customers in selected metropolitan areas may request assistance seeking separate quotations from independent licensed plumbers and electricians. No quote or trade availability is guaranteed.
What is the model number for the Stellar 125L?
The Rheem model family is 4A1125. Rheem separately lists 4A1125G4 for a 1.8kW version and 4A1125G7 for a 3.6kW version.
What is the difference between 4A1125G4 and 4A1125G7?
The element power rating: G4 is 1.8kW and G7 is 3.6kW according to the respective Rheem product listings. Both share the 125L rated delivery and basic single-element tank format.
Is the 125L figure actual tank capacity?
125L refers to rated hot-water delivery. Rheem’s May 2025 brochure lists 135L physical storage capacity, so these numbers measure different things.
Is the Stellar 125L suitable for four people?
Rheem lists up to four people under assumptions including seven-minute showers at 42°C mixed water temperature, a moderate climate and a time-of-use tariff. Actual hot-water demand can make the appropriate size larger or smaller.
Is this a stainless steel water heater?
Yes. Rheem identifies stainless steel construction for both the storage cylinder and the water fittings.
Does a Stellar 125L need a sacrificial anode?
No. Rheem states there is no sacrificial anode in this stainless steel range. The tank and valves still require maintenance in accordance with the manufacturer guide.
Does no anode mean no maintenance at all?
No. Relief valves, electrical equipment, water pressure controls and other components still require inspection and servicing according to Rheem instructions.
How tall is the Rheem Stellar 125L?
Rheem lists an overall height of 1295mm. Additional working clearance may be required above and around the unit.
What are the width and depth?
The Rheem technical drawing lists 495mm body width. The May 2025 brochure lists dimension C as 500mm, while the October 2025 manual lists it as 485mm. Confirm the revision and actual clearance from the supplied unit and latest installation drawing.
What does the empty water heater weigh?
Rheem gives approximately 31kg as packaged/shipped weight. This is not the full operating weight when filled with water.
Can the Stellar 125L be installed indoors?
Yes, where the site satisfies relevant plumbing, electrical, drainage, access and safety requirements.
Can the Stellar 125L be installed outdoors?
Yes, Rheem permits suitable indoor or outdoor installations, subject to the applicable installation guide and required conditions.
Does it support cold-water connections on either side?
Yes. Rheem describes dual-handed cold-water inlets. The hot-water outlet is at the top and the TPR valve position is to the side.
What is the water connection size?
Rheem lists Rp 3/4 water connections. Have the licensed plumber confirm the compatible fittings and layout.
What is the relief-valve pressure rating?
The listed temperature-and-pressure relief valve setting is 1400kPa for 4A1125.
What expansion control valve setting applies?
The manufacturer specifies an ECV setting of 1200kPa where an expansion control valve is required.
What water supply pressures are permitted?
Rheem lists maximum supply pressures of 960kPa with an ECV and 1120kPa without an ECV. The licensed plumber must assess supply pressure and the required controls.
Is it available in 1.8kW and 3.6kW?
Yes. Rheem lists both power ratings for the 4A1125 model family. Verify the SKU and rating plate of the specific heater being purchased.
Will the 3.6kW model heat faster?
Higher element power generally provides faster electrical reheating under similar conditions, but suitability and actual recovery depend on the unit, wiring, controls and available electricity supply.
Can I use an off-peak electricity tariff?
Potentially. The model, element rating, electricity tariff window and household demand must all suit the approved wiring and tariff arrangement.
Is it suitable for every water supply?
No. Rheem warns that stainless steel heaters are not recommended for some areas and specifies water chemistry exclusions affecting warranty coverage.
What chloride content is allowed?
The October 2025 Rheem guide says cylinder warranty does not apply where chloride exceeds 250mg/L.
What total dissolved solids level is allowed?
The October 2025 guide identifies TDS above 600mg/L as outside the listed stainless steel cylinder warranty water-quality limits.
What water pH range is covered?
Rheem identifies cylinder warranty exclusions for water with pH below 6.0 or above 9.5.
Does the warranty also mention saturation index?
Yes. The October 2025 guide lists different saturation-index thresholds affecting specified components. Check the complete water-supply section when water quality is uncertain.
What is the Stellar 125L cylinder warranty?
For eligible single-family domestic dwellings, Rheem specifies up to 12 years on the cylinder. Coverage includes labour in years 1–3, but only a replacement cylinder in years 4–12; other terms and exclusions apply.
Are parts and labour covered for 12 years?
No. Year one covers all components and labour under the published conditions. For eligible domestic cylinders, years two and three include cylinder labour; years four to twelve exclude installation and repair labour.
Does the 12-year cylinder warranty apply to every property?
No. Rheem specifically restricts the extended cylinder period to qualifying installations in a single-family domestic dwelling. Other installation categories must be assessed under the actual warranty.
How often should the water heater be serviced?
The October 2025 guide recommends a major service in the sixth year after installation and gives other component and safety checks. Failure to arrange the specified service may affect a claim if it would have prevented the fault.
Can I have the old hot water unit removed through the product price?
No. Removal, handling, disposal and any required plumbing/electrical changes are separate services and costs.
Does delivery cover Brisbane?
Selected Brisbane metro delivery addresses may be eligible. Availability, charges and scheduling must be confirmed for the actual address.
Does delivery cover the Gold Coast?
Delivery may be available in selected Gold Coast areas; confirm the product and address before purchase.
Does delivery cover Sydney?
Selected Sydney metropolitan delivery areas may be eligible, subject to current freight coverage and unit availability.
Does delivery cover Melbourne?
Selected Melbourne metropolitan delivery areas may be eligible, subject to address-dependent service coverage.
Is the Stellar 125L the same as Rheem’s standard 125L electric heater?
No. Stellar 4A1125 is a stainless steel cylinder heater with no sacrificial anode; the standard vitreous enamel family uses different cylinder protection, model codes and potentially different site specifications.
Should I choose the Stellar 125L or Stellar 160L?
The 125L has 125L rated delivery and 135L physical storage. The 160L provides higher delivery and larger physical storage but is taller. Choose based on actual demand and the available installation space.
Are there 250L and 315L Stellar models?
Yes. Rheem publishes larger 250L and 315L stainless steel models; these have distinct physical dimensions, element options and pressure settings that should not be applied to the 125L.
Is a rebate included with purchase?
No rebate or government incentive is guaranteed by this supply-only listing. Any applicable program must be checked against current eligibility requirements.
What should I check before ordering?
Confirm the model and element SKU, water quality, tank dimensions, electrical circuit, plumbing layout, water pressure, access, delivery address and separate licensed trade requirements.
Where do these specifications come from?
From Rheem Australia’s 4A1125 product pages, the 4A1125 plumbers specification, its May 2025 domestic brochure and its October 2025 owner and installation guide.
Official Rheem Sources and Specification Notes
Technical and warranty values on this page have been checked against the following Rheem Australia publications. Reconfirm any detail against the supplied appliance rating plate and current installation manual before work begins.
- Rheem 4A1125G4 1.8kW official product page
- Rheem 4A1125G7 3.6kW official product page
- Rheem 4A1125 plumbers technical handbook
- Rheem May 2025 domestic hot water brochure
- Rheem October 2025 owners, installation and warranty guide
HWO delivery and installer-quote assistance are retailer service information supplied for this listing; they are not manufacturer-published technical product claims. No prices, inventory guarantees, installation packages or independent installer availability are assumed.
Order Rheem Stellar 125L Stainless Steel Electric Supply Only
Choose your 4A1125 single-element variant and confirm freight eligibility with Hot Water Outlet. Installation is not included. Any assistance requesting independent licensed trade quotations is separate and dependent on location and installer availability.
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.
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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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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.
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