Stiebel Eltron WWK 302H 302L Heat Pump Hot Water System
Buy the Stiebel Eltron WWK 302H from Hot Water Outlet as a supply-only 302L heat pump water heater. The WWK 302H combines ambient-air heat pump technology with a 1.7kW smart element to assist recovery during high hot-water use. Selected Australian metro delivery may be available; installation is arranged separately with independent licensed trades.
About the Stiebel Eltron WWK 302H
Large-capacity, integrated domestic air-source heat pump with smart-boost support
The WWK 302H takes usable heat from the surrounding air and transfers it to its 302L enamelled-steel hot-water cylinder. Unlike a standard resistance-heated electric storage system, the compressor normally provides the heat, helping reduce electricity demand under suitable climate, tariff and installation conditions.
The “H” designation matters: the WWK 302H includes a 1.7kW electric smart element in the upper tank to assist water recovery after high draw-off. The otherwise similar WWK 302 does not include this element. The system also provides active defrost, optional solar-PV signal integration and an impressed-current corrosion-protection anode.
Model-code confirmation: The supplied draft names article 233211, but STIEBEL ELTRON’s May 2024 Australian datasheet and its WWK installation manual identify 232905 as the WWK 302H article number. Confirm the exact SKU, manufacturer rating plate and product revision with the seller before ordering.
Key features of the WWK 302H
Eight practical reasons to consider the H-model
Larger WWK cylinder for households with substantial daily hot-water demand.
The H-model booster supports recovery of approximately the upper 80L when needed.
Australian seasonal coefficient of performance for climate zone HP2-AU under stated modelling.
Helps the heat pump continue operating at ambient temperatures as low as −5°C.
An external signal can activate a second temperature target when correctly configured.
Electronic corrosion-protection system; its power supply needs to be maintained.
Manufacturer nominal maximum mixed-water amount under specified temperature assumptions.
Only where air volume, placement, drainage, clearances and local rules are satisfied.
WWK 302H technical specifications
Model-specific figures from STIEBEL ELTRON Australian datasheets and installation manual
| Specification | WWK 302H |
|---|---|
| Manufacturer | STIEBEL ELTRON |
| Product name | WWK 302 H / WWK 302H |
| Manufacturer article number | 232905 in May 2024 manufacturer datasheet and official installation manual; confirm the unit label |
| Article 233211 in submitted text | Not substantiated for WWK 302H by checked manufacturer technical documents; confirm seller stock code before ordering |
| Appliance type | Integrated air-source heat-pump domestic hot-water heater |
| Tank nominal storage capacity | 302L |
| Available nominal mixed hot water at 40°C | Up to 540L under stated manufacturer conditions |
| H-model smart booster element | 1.7kW (2024 Australian datasheet) |
| Smart element heated portion | Approximately upper 80L when activated |
| Heat-pump electrical input, EN16147 at A15 | 0.55kW |
| Seasonal COP, Australia | 3.58 in climate zone HP2-AU, based on AS/NZS 4234 modelling |
| Average heat-pump heating output at A15 / W10–55 | 1.6kW (installation manual) |
| Operating ambient temperature | −5°C to +42°C |
| Nominal DHW set temperature | 61°C |
| Maximum DHW temperature | 65°C |
| Operating modes | Heat pump operation, active defrost, H-model booster and configurable external signal |
| Refrigerant | R134a, per May 2024 data table; verify actual unit plate |
| Refrigerant charge | 0.85kg |
| Refrigerant GWP100 | 1430 in manufacturer guide |
| Rated supply | 240V, single-phase 1/N/PE |
| Maximum operating current | 9.70A (H-model), per May 2024 Australian data sheet |
| Guide-referenced fuse protection | C16 for H-model; licensed electrician must confirm circuit to local rules |
| Maximum start-up current | 23.44A per manufacturer installation guide |
| Air flow | 550m³/h |
| Sound pressure | 45 dB(A) at 1m in free field, per manufacturer test |
| Sound power | 60 dB(A) EN12102, from operation/installation guide |
| Ingress protection | IP24 |
| Height with adjustable feet | 1921–1937mm |
| Diagram body dimension excluding adjustment | 1905mm; do not use instead of installed adjustable-foot height |
| Diameter | 690mm |
| Weight empty | 135kg |
| Weight filled | 437kg manufacturer value; structural support must be verified |
| Height when tilted for handling | 2026mm (guide); greater clearance may be necessary during delivery/positioning |
| Minimum indoor free air volume | 13m³ in manufacturer instructions, plus other airflow and site requirements |
| Outdoor air clearance guidance | At least 500mm either side of grille per manufacturer product page; consult site-specific clearance drawing |
| Cold water inlet connection | G 1 male thread |
| Hot water outlet connection | G 1 male thread |
| Temperature/pressure relief port | Rp 3/4 female thread |
| Condensate drain connection | G 3/4 male thread |
| Maximum appliance operating pressure | 850kPa in manufacturer operation/installation guide |
| Mains pressure / plumbing design | May 2024 Australian sheet states maximum permissible pressure of 500kPa in accordance with AS/NZS 3500.4 |
| T&P relief valve | 850kPa in May 2024 Australian data sheet; 2018 sheet lists 700kPa — confirm revision |
| Water conductivity range | 100–1500 µS/cm, guide specification |
| Corrosion protection | Impressed-current anode; battery and power requirements depend on supply interruptions |
| WaterMark approval | WMKA00301; AS3498 |
| Manufacture / design | Made in Europe, German engineered for Australian conditions (manufacturer claim) |
| Warranty: cylinder/condenser (domestic) | 5 years; manufacturer terms and installation category apply |
| Warranty: sealed refrigeration/electrical (domestic) | 2 years; manufacturer terms apply |
| Warranty: T&P relief valve (domestic) | 1 year; manufacturer terms apply |
Test values are not guarantees of installed performance. Manufacturer editions differ on some water-pressure and valve figures. The actual supplied unit rating plate, manufacturer-supplied guide and current AS/NZS plumbing and electrical requirements must be checked by licensed installers.
WWK 302 vs WWK 302H — what does the H model add?
| Feature | WWK 302 | WWK 302H (this page) |
|---|---|---|
| Tank storage | 302L | 302L |
| Smart recovery element | Not fitted | 1.7kW; assists upper ~80L |
| Heat pump electrical input | 0.55kW | 0.55kW |
| Seasonal COP, Australian zone HP2-AU | 3.58 | 3.58 |
| Max operating current | 3.18A | 9.70A |
| Nominal mixed 40°C hot water | Up to 540L | Up to 540L |
The smart element is recovery assistance, not another 302L of storage and not a second heat pump. Auxiliary resistance heating uses more electricity while active than heat-pump-only operation.
How the heat pump and smart element work
Ambient-air heat pump
Air passes over the evaporator and refrigerant circuit. The compressor transfers collected heat to the stored water. STIEBEL ELTRON gives 0.55kW heat-pump electrical input at its nominated EN16147/A15 test condition and seasonal COP 3.58 in Australian climate zone HP2-AU.
Efficiency and heat-up time change with intake air temperature, water draw-off, operating mode and site airflow.
1.7kW smart element
The H-model booster can heat approximately the top 80L when higher household demand triggers recovery assistance. This provides a more rapid supply of usable hot water near the top of the tank.
When activated, the element adds an electrical load; it does not make the tank larger or guarantee a particular number of simultaneous showers.
302L storage and up to 540L mixed water at 40°C
The cylinder physically stores 302 litres. Stiebel Eltron separately publishes a maximum available nominal amount of 540L at 40°C. This is a test-dependent mixed-water illustration made possible because hotter tank water can be blended with cold water for use at shower temperature.
Do not interpret 540L as a second storage capacity. Actual mixed water availability depends on storage temperature, cold water inlet temperature, outlet flow, heat-up/recovery, controls and how a household draws water. The manufacturer guide lists the 302 family as suitable for up to six users under its usage assumptions, rather than guaranteeing performance for six people.
Cold-weather operation, compressor sound and defrost
STIEBEL ELTRON lists heat-pump operation from −5°C to +42°C ambient with active defrost. When frost builds on the evaporator in suitable conditions, a defrost cycle helps restore normal heat transfer. Cold weather can still change recovery rate and energy consumption.
The stated 45 dB(A) sound pressure at one metre is a free-field test result; the guide also lists 60 dB(A) sound power. They are different acoustic measures. Installed sound at a neighbour’s window or adjacent wall depends on clearance, reflections and mounting arrangements and requires site-specific consideration.
Solar PV, off-peak tariffs and electrical planning
The WWK 302H does not require sunlight to heat water. For homes with solar PV, the installer may configure an external signal contact to activate a second, higher hot-water set temperature at suitable times. The electrical signal and any energy management controls must be compatible with the manufacturer’s guide.
Stiebel Eltron lists 9.70A maximum operating current for the H-model and its installation manual references C16 fuse protection. It also provides detailed switching arrangements for the impressed-current anode: regular interrupted supplies may require a separate continuous anode supply or battery replacement on the manufacturer’s schedule. A licensed electrician must check the actual installation and tariff arrangement.
Impressed-current anode caution: Calling the anode “maintenance-free” does not mean the entire electrical protection arrangement can be ignored. The manual states that rechargeable backup batteries can require replacement every three years in regularly interrupted supply configurations.
Indoor and outdoor installation: check the entire site
Outdoor installation
Confirm unobstructed air intake/discharge, manufacturer clearances (its product page references 500mm either side of the air grille), condensate management, access for service and a stable compliant platform. Noise and nearby windows deserve particular attention.
Indoor installation
The manufacturer permits indoor placement subject to at least 13m³ clear air space and further requirements for air movement, condensate, humidity, installation access and local compliance. Not every cupboard, garage or enclosed alcove qualifies.
The appliance measures 690mm diameter and 1921–1937mm high with adjustable feet. Empty and water-filled weights are 135kg and 437kg, so transport path, handling, slab/load-bearing strength and all service access must be assessed. The installation drawing’s 1905mm figure is a body dimension, not the full adjustable-foot height.
Plumbing, condensate drainage and water pressure
A licensed plumber should assess the G 1 cold and hot water connections, appropriate compatible valves, T&P relief piping, water quality and G 3/4 condensate drain. These are not optional details: heat pumps generate condensate during normal operation, and a blocked or improperly routed drain can create issues.
Pressure document discrepancy: The STIEBEL ELTRON installation guide quotes 850kPa maximum appliance operating pressure, while the May 2024 Australian datasheet publishes 500kPa maximum permissible pressure for AS/NZS3500.4 plumbing design and an 850kPa PTR valve. An older 2018 sheet shows a 700kPa supplied PTR valve. These are different documents/contexts and must not be treated as interchangeable instructions. The current unit manual and prevailing Australian plumbing requirements control the installation.
Is the WWK 302H right for your home?
The WWK 302H may be appropriate for families, larger owner-occupied homes, suitable townhouses and some investment properties where a large cylinder and the smart-element recovery support are useful. It is especially relevant for electric-storage replacements where the installer can accommodate the required airflow, drainage, plumbing and power connection.
Why it may suit
- 302L cylinder and enhanced H-model recovery
- Heat-pump efficiency potential compared with conventional electric storage
- Solar-PV / energy management compatibility
- Active defrost for varying Australian climates
- Option for suitable indoor or outdoor sites
- Preference for an impressed-current corrosion-protection system
What to confirm
- Correct WWK 302H model and stock code
- Household draw-off and recovery requirements
- Equipment height, floor loading and installation access
- Air-path clearances and indoor minimum air volume
- Electrical circuit, off-peak switching and anode protection
- Valve kit, mains pressure, condensate and relief drainage
Supply-only WWK 302H from Hot Water Outlet
Hot Water Outlet is a supplier, not an installation contractor. You can order the Stiebel Eltron WWK 302H as a supply-only system and appoint your own suitably licensed plumber and electrician for the works.
Unless separately and explicitly itemised, the price does not include installation labour, electrical connections or switchboard work, plumbing modifications, valves, pressure limiting devices, condensate/T&P drain lines, a base or tray, equipment lifting, old heater removal, disposal, certification or other site-specific costs.
Optional installation-quote assistance: After purchase, HWO customers in selected metro areas may request help obtaining a quotation from an independent licensed installer. HWO does not directly carry out the installation. Quote availability, prices, timing and suitability depend on the installer and property.
Selected metro delivery: Brisbane, Gold Coast, Sydney and Melbourne
Hot Water Outlet may offer metro delivery to selected areas of Brisbane, the Gold Coast, Sydney and Melbourne. Coverage depends on postcode, stock and freight arrangements; not every area is serviced for every product.
Before ordering, confirm availability, delivery charges, unload conditions, pallet access, delivery timing, the actual manufacturer article number and whether your site can accommodate the large heat-pump cylinder. Delivery does not include installation.
WWK 302H warranty — domestic and commercial
Warranty is provided by STIEBEL ELTRON subject to its Australian terms
| Covered part / installation category | Published manufacturer term |
|---|---|
| Cylinder and condenser — domestic | 5 years, with eligible labour coverage under STIEBEL ELTRON warranty terms |
| Sealed refrigeration system — domestic | 2 years, including compressor, evaporator, valves and associated pipework |
| Other electrical components — domestic | 2 years |
| Temperature and pressure relief valve — domestic | 1 year |
| Cylinder and condenser — commercial | 2 years |
| Sealed refrigeration and electrical — commercial | 2 years |
| Temperature and pressure relief valve — commercial | 1 year |
The manufacturer’s warranty schedule marks these eligible component terms as including labour. The warranty period normally begins on installation completion; where that date is unknown, the guide states it begins two months after manufacture. Read the full conditions, exclusions and claim instructions. Your rights under Australian Consumer Law remain applicable.
WWK 302H frequently asked questions
Answers about buying, model selection, performance and site suitability
Can I buy the Stiebel Eltron WWK 302H supply only?
Yes. Hot Water Outlet lists the WWK 302H as a supply-only water heater. Installation labour and materials are separate.
Does Hot Water Outlet install the WWK 302H?
No. Hot Water Outlet does not directly provide plumbing or electrical installation. In selected metro locations, you may request assistance obtaining independent licensed-installer quotes after purchase.
Is installation included in the product price?
No. Unless explicitly stated in the applicable separate transaction, the product price covers the supplied unit, not installation, valves, drainage, electrical works, removal or disposal.
What is the correct WWK 302H article number?
STIEBEL ELTRON’s May 2024 Australian datasheet and installation manual list 232905. The 233211 code in the supplied draft was not confirmed for this model; check the item label and seller SKU.
Is WWK 302H the same as WWK 302?
No. Both are 302L, but the WWK 302H has the 1.7kW H-model smart element. The standard WWK 302 does not.
What is the difference between WWK 222H and WWK 302H?
The WWK 222H has a 220L tank; the WWK 302H has a 302L tank. Both are H-models with the auxiliary smart element.
How much water can the WWK 302H deliver at 40°C?
The manufacturer lists up to 540L of nominal mixed hot water at 40°C under specified conditions. This is not 540L of physical tank storage.
What is the storage capacity?
The manufacturer rates the WWK 302H cylinder at 302 litres.
What is the smart element power?
The Australian May 2024 data sheet lists 1.7kW for the H-model smart element.
What part of the tank does the booster heat?
STIEBEL ELTRON states the element can support heating of approximately the upper 80L during high hot-water draw-off.
Can the WWK 302H operate in cold weather?
It is specified for heat-pump operation down to −5°C ambient air and includes active defrost. Output and recovery still vary with temperature.
Does the WWK 302H need sunlight?
No. It extracts heat from ambient air. Solar PV can provide an optional electricity integration, but sunlight is not required for normal heat-pump operation.
Can I use the WWK 302H with solar PV?
Yes, a suitable external signal and electrical configuration can call a higher temperature setpoint. This requires compatible controls and professional setup.
What is the seasonal COP?
The May 2024 Australian sheet lists 3.58 for WWK 302H in climate zone HP2-AU under AS/NZS 4234 modelling conditions.
How much electricity does the heat pump use?
At the stated EN16147/A15 test condition, the manufacturer lists 0.55kW heat-pump input. Total demand is higher when the smart element is used.
What power circuit is required?
The Australian specification lists a maximum operating current of 9.70A for the H-model; the manufacturer manual references C16 fuse protection. A licensed electrician must determine the compliant circuit and switching arrangement.
Can it run on an off-peak tariff?
Potentially, if enough heating time is available and the impressed-current anode remains correctly powered. Have the electrician review the supply arrangement with the manufacturer guide.
Why does an impressed-current anode matter?
It provides electronic corrosion protection without a conventional sacrificial anode, but it still depends on correct electrical supply and any required battery maintenance.
Does the impressed-current anode require maintenance?
The manufacturer calls the anode itself maintenance-free, but its guide says backup rechargeable batteries may need replacement every three years where the supply is regularly interrupted.
Can the WWK 302H be installed indoors?
STIEBEL ELTRON lists indoor installation as possible when the site provides at least 13m³ of free air space and meets other ventilation, noise, drainage and access conditions.
Can it be installed outdoors?
Yes, where the site meets manufacturer clearance, drainage, weather exposure, base, airflow and service requirements.
How much ventilation clearance is required?
The manufacturer product page describes 500mm either side of the air grille outdoors. The full current installation guide and site layout govern all required air-path and service clearances.
What are the WWK 302H dimensions?
The listed height with adjustable feet is 1921–1937mm, with 690mm diameter. The technical drawing also shows a 1905mm body dimension; allow for feet, handling and connections.
How much does the system weigh?
The manufacturer gives 135kg empty and 437kg filled. Delivery handling and base suitability need to be checked before purchase.
What are the water connections?
The guide specifies G 1 male cold inlet and hot outlet, Rp 3/4 female T&P port and G 3/4 male condensate connection. Valve and adaptor requirements are installation-specific.
What is the maximum water pressure?
The installation guide lists 850kPa appliance operating pressure, while the May 2024 Australian sheet sets 500kPa as a permissible plumbing supply figure under AS/NZS3500.4. The licensed installer must comply with the current local pressure/valve requirements.
What refrigerant is used?
The May 2024 model table and operation manual list R134a, 0.85kg for WWK 302H. Check the actual unit rating plate for any revised stock.
What is the operating noise?
STIEBEL ELTRON lists 45 dB(A) sound pressure at 1m in free-field test conditions. Installed noise depends on mounting location and surroundings.
Is the WWK 302H eligible for STCs?
Potentially, if the exact model, installer, location, date and current rules qualify. Certificate counts and values can change and are not guaranteed by a supply-only purchase.
How long is the STIEBEL ELTRON domestic warranty?
The current manufacturer warranty schedule states five years for cylinder/condenser, two years for refrigeration and electrical parts and one year for the T&P relief valve, subject to its published terms.
What is the WWK 302H commercial warranty?
STIEBEL ELTRON lists two years for cylinder/condenser and two years for sealed-system/electrical components, with one year for the T&P relief valve, under commercial warranty terms.
Is labour included in the manufacturer warranty?
The manufacturer’s published WWK table marks eligible stated component warranties as including labour. Refer to its actual warranty conditions and exclusions, which operate alongside Australian Consumer Law.
Can I get an installation quote after buying?
In selected metro areas HWO may assist customers after purchase in seeking quotes from independent licensed plumbers/electricians. Availability and quoted services are not guaranteed.
Where does Hot Water Outlet deliver?
Selected metro delivery may be available around Brisbane, Gold Coast, Sydney and Melbourne. Confirm destination, stock, freight cost, access and scheduling before payment.
How does the WWK 302H compare with standard electric storage?
It uses a heat pump for primary water heating with optional H-model element assistance, whereas a conventional electric tank uses resistance heating. Real operating costs depend on electricity pricing, climate and usage.
Order the Stiebel Eltron WWK 302H supply only
Choose the 302L H-model heat pump with the 1.7kW smart element for suitable hot-water demands. Confirm the manufacturer's 232905 article number and revision, current stock, freight to your postcode and all installation requirements before purchasing. Hot Water Outlet supplies the product and does not directly install it.
Official STIEBEL ELTRON technical references
All additional technical data in this listing was checked against manufacturer documents and the official Australian warranty page. If documents differ, confirm the actual model revision and use the instructions supplied with your unit.
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.
Buying a new hot water system or hot water part should be simple. Hot Water Outlet helps you compare hot water systems, valves, thermostats, elements, pipework and fittings in one place, so you can choose the products that suit your home, budget and hot water needs without the back and forth.
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Valves and Accessories Available
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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.
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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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