Stiebel Eltron WWK 222 220L Heat Pump Hot Water System
Buy the Stiebel Eltron WWK 222 (manufacturer article 231209) as a supply-only 220L heat-pump hot-water system. The standard non-H model uses ambient-air heat, active defrost and a maintenance-free impressed-current anode. It has solar PV control compatibility and does not include the electric smart element fitted to WWK 222H.
About the Stiebel Eltron WWK 222
Standard 220L non-H model — manufacturer article 231209
The Stiebel Eltron WWK 222 is a 220L integrated air-source heat-pump hot water system designed to extract heat from ambient air and transfer it into an enamelled-steel storage cylinder. The model can reduce reliance on direct electric resistance heating compared with a conventional electric storage heater, depending on usage and conditions.
This listing is exclusively for the standard WWK 222, article 231209. It includes active defrost, an impressed-current anode and compatible solar PV control input, but does not include the H-model 1.7kW smart element.
Model check before ordering: WWK 222 231209 and WWK 222H 233209 both have 220L storage, but their electric booster, current ratings and recovery options differ. Order the exact model specified by your licensed installer.
Eight key WWK 222 features
Model-specific benefits without mixing H-model specifications
One-piece heat-pump storage system with enamelled-steel hot-water tank.
WWK 222 (231209) does not feature the electric smart element found in WWK 222H.
Australian zone HP2-AU seasonal performance figure under specified testing assumptions.
Heat-pump operation listed from −5°C to +42°C ambient conditions.
Accepts a suitable external signal to change the hot-water target during solar production.
Electronic, non-sacrificial corrosion protection for the enamelled cylinder.
Nominal amount at 40°C in the manufacturer test example, not the storage capacity.
Indoor installation requires at least 13m³ clear air volume and compliant siting.
Technical specifications — WWK 222
52 model-specific specification entries
| Specification | WWK 222 details |
|---|---|
| Manufacturer | STIEBEL ELTRON |
| Range | WWK domestic air-source heat-pump hot water |
| Product | WWK 222 — standard non-H model |
| Article number | 231209 |
| Different H-model article | WWK 222H: 233209 (not supplied by this listing) |
| Water-heater type | One-piece heat-pump storage hot water |
| Tank material | Enamelled steel |
| Corrosion protection | Maintenance-free impressed-current anode technology |
| Nominal physical storage capacity | 220L |
| Nominal available water at 40°C | Up to 360L under manufacturer stated assumptions |
| Manufacturer user guideline | Up to four people, depending on consumption |
| Electric smart/backup element | Not fitted to WWK 222 non-H model |
| Heat-pump electrical input, EN16147/A15 | 0.55kW (Australian May 2024 datasheet) |
| Average heating output, A15/W10–55 | 1.6kW (operation and installation guide) |
| Maximum heat-pump input excluding start-up | 0.65kW (operation and installation guide) |
| Seasonal COP (Australia) | 3.94 — HP2-AU climate zone, AS/NZS 4234 basis |
| Refrigerant | R134a (WWK 222 model-specific table) |
| Refrigerant charge | 0.85kg (manufacturer operation and installation guide) |
| Heat-pump ambient range | −5°C to +42°C |
| Cylinder ambient operating range | −5°C to +55°C (operation manual) |
| Nominal hot-water setpoint | 61°C |
| Maximum hot-water setpoint | 65°C |
| Active defrost | Yes |
| Solar PV / energy-management compatibility | External signal input and compliant switching required |
| Voltage | 240V Australian datasheet; 220–240V 1/N/PE in manual |
| Maximum operating current, standard model | 3.18A |
| Maximum start-up current | Check specific unit rating plate and manual |
| Electrical standards | AS/NZS 3000 and manufacturer installation instructions |
| Airflow | 550m³/h |
| Sound pressure level | 45dB(A) at 1m, free field, manufacturer test |
| Ingress protection | IP24 |
| Height, including adjustable feet | 1553–1569mm |
| Illustrated body dimension (excludes feet) | 1501mm; do not substitute for installed height |
| Cylinder diameter | 690mm |
| Empty weight | 120kg |
| Approximate filled weight | 340kg |
| Indoor air volume requirement | Minimum 13m³ clear room volume; other airflow conditions also apply |
| Outdoor side grille clearance | 500mm on either side per manufacturer product information; consult complete guide |
| Cold-water connection | G 1 male (manufacturer installation guide) |
| Hot-water connection | G 1 male (manufacturer installation guide) |
| Temperature/pressure relief port | Rp 3/4 female (manufacturer installation guide) |
| Condensate drain connection | G 3/4 male (manufacturer installation guide) |
| Australian datasheet maximum permissible pressure | 500kPa, AS/NZS 3500.4 context |
| Installation guide maximum appliance operating pressure | 850kPa; different stated context |
| T&P relief valve rating | 850kPa in the May 2024 Australian datasheet |
| Potable-water conductivity range | 100–1500 µS/cm, subject to manual |
| WaterMark | WMKA00301 / AS3498 |
| Manufacturing | European-made; German engineered per manufacturer |
| Domestic cylinder/condenser warranty | 5 years, subject to terms |
| Domestic sealed refrigeration warranty | 2 years, subject to terms |
| Domestic electrical-component warranty | 2 years, subject to terms |
| Domestic T&P relief valve warranty | 1 year, subject to terms |
Manufacturer specifications come from Stiebel Eltron’s Australian WWK product page, May 2024 datasheet, installation guide and warranty schedule. Figures measured under test conditions are not guaranteed in every installation. The actual unit rating plate and current model instructions take precedence for installation planning.
WWK 222 versus WWK 222H
Both have 220L cylinders; the electrical recovery architecture differs
| Feature | WWK 222 — this listing | WWK 222H — separate product |
|---|---|---|
| Article number | 231209 | 233209 |
| Nominal storage | 220L | 220L |
| Smart booster element | Not fitted | 1.7kW in AU datasheet |
| Heat-pump power at A15 | 0.55kW | 0.55kW |
| Max operating current | 3.18A | 9.70A |
| Australian seasonal COP | 3.94 | 3.94 |
| 40°C nominal mixed hot water | Up to 360L | Up to 360L |
| Additional element-assisted recovery | No | Yes; when triggered |
The H model adds a 1.7kW electrical smart element that can assist hot-water recovery in high-use situations. The standard WWK 222 does not have that booster and has a different maximum current rating. A higher hot-water demand is a reason to review usage and recovery requirements, not an automatic need to choose the H model.
WWK 222 versus WWK 302
The next cylinder size up in the standard WWK range
| Specification | WWK 222 — this listing | WWK 302 — larger alternative |
|---|---|---|
| Article number | 231209 | 231211 |
| Physical cylinder | 220L | 302L |
| Mixed water at 40°C, stated test | Up to 360L | Up to 540L |
| Seasonal COP HP2-AU | 3.94 | 3.58 |
| Max operating current | 3.18A | 3.18A |
| Height with adjustable feet | 1553–1569mm | 1921–1937mm |
| Diameter | 690mm | 690mm |
| Empty / filled weight | 120kg / 340kg | 135kg / 437kg |
| Smart electric element | No | No |
Both compared units are standard non-H versions. The WWK 302 provides a larger cylinder and higher nominal mixed-water volume, but is significantly taller and heavier when filled. Choose based on real household demand, available installation room, base capacity and access.
How heat-pump hot water works
The WWK 222 fan draws ambient air across an evaporator, transferring heat to its refrigerant circuit. A compressor increases the refrigerant temperature, and heat is passed to stored water through the condenser. The appliance primarily uses heat from air rather than an electric resistance element to heat water.
The manufacturer specifies 0.55kW electrical consumption at the EN16147/A15 heat-pump test condition and 3.94 Australian seasonal COP under its defined modelling conditions. Actual electricity use and temperature recovery depend on climate, hot-water draw, heat-pump cycling, setpoint, tariffs and siting.
Important: A seasonal COP is a performance metric, not a promise of a particular electricity bill or a fixed percentage saving for every household.
No smart element — an essential model distinction
The WWK 222 non-H is designed for heat-pump water heating without the auxiliary H-model booster. Its WWK 222H counterpart integrates an electric smart element rated 1.7kW in Stiebel Eltron’s Australian datasheet.
The absence of a smart element affects recovery options and electrical characteristics. Households with larger back-to-back shower demand or constrained heating windows should compare the H model or larger WWK 302 after assessing usage.
360L mixed water and the real 220L cylinder
Stiebel Eltron describes 220L physical tank volume and up to 360L at 40°C under the manufacturer’s mixed-water reference conditions, using 20°C incoming cold water. The 360L figure accounts for the mixing of stored hot water with incoming cold water; it is not a 360L storage tank.
Shower and outlet availability varies with cold-water temperature, mixing arrangements, storage temperature, use patterns, pipework and shower flow rates.
Active defrost for colder climates
The manufacturer rates heat-pump operation over ambient air temperatures of −5°C to +42°C. Active defrost helps clear frost from the evaporator when cold conditions affect the heat exchanger. Performance and recovery vary with outdoor temperature, so the rated temperature range is not a guarantee of identical output throughout the range.
Solar PV and off-peak power compatibility
The WWK 222 can integrate with compatible solar PV and energy-management configurations. When a suitable external control signal is provided, the unit can increase its hot-water temperature target during periods of solar generation, helping homeowners make use of available solar electricity. Solar panels, a relay and any control integration are not included as part of this product listing.
Off-peak electricity may be suitable where permitted by the manufacturer and where the heating window meets demand. Electrical design must account for the impressed-current anode system and its backup provisions. A licensed electrician should assess isolation, power interruption, tariff switching and compliance before installation.
Corrosion protection and water quality
The enamelled-steel cylinder has a manufacturer-described maintenance-free impressed-current anode. Unlike a sacrificial anode, its electrochemical corrosion protection depends on an electronic system rather than wearing away a metal rod in normal operation.
Maintenance-free does not mean the entire appliance needs no inspection. The manufacturer's manual includes water-quality limits, anode power and backup-battery considerations. Licensed trades should assess the property’s water quality and ongoing service needs.
Installation space, sound and full unit weight
Indoor positioning
The manufacturer permits selected indoor installation where at least 13m³ of clear space is available alongside ventilation, airflow, access, condensate and other requirements. A sealed cupboard should not be assumed suitable.
Outdoor positioning
The manufacturer’s website states 500mm side clearance on either side of the grille. Final placement must also satisfy other manual clearances, noise and drainage requirements.
The WWK 222 is 690mm diameter and 1553–1569mm high including adjustable feet. It weighs 120kg empty and approximately 340kg full. The 1501mm dimension on its schematic is not the complete installed height. Verify access, floor/base load capacity, acoustic positioning and handling before purchase.
Manufacturer sound pressure is 45dB(A) at one metre in free-field conditions; actual installed noise can differ due to nearby buildings, walls, fences, bedrooms and reflections.
Plumbing, condensate and pressure settings
Heat-pump water heaters generate condensate during normal operation. The installer must provide appropriate drainage as well as compliant safety valve discharge and water connections.
Manufacturer pressure-document distinction: The May 2024 Australian datasheet lists 500kPa maximum permissible pressure in its AS/NZS 3500.4 context and an 850kPa PTR valve. The operation/installation guide separately lists 850kPa maximum cold/hot appliance operating pressure. They should not be treated as interchangeable pressure-limiting valve setpoints. Confirm exact variant, Australian installation rules and manufacturer's applicable guide.
Model manual water fitting descriptions include G 1 hot and cold connectors, Rp 3/4 relief-valve connection and G 3/4 condensate outlet. The appointed plumber must check every fitting, valve and discharge point rather than use the table alone as installation instructions.
Who should consider the WWK 222?
The WWK 222 may suit smaller-to-medium families replacing a conventional electric storage system, townhouses with sufficient installation space, and homes with solar PV or a compatible tariff. The manufacturer operation guide offers a four-user guideline, but daily hot-water demand, peak showers, climate and recovery expectations matter more than occupancy alone.
Good reasons to consider it
- Need a 220L standard non-H heat pump
- Want to use ambient air instead of resistance-only heating
- Have compatible solar PV or energy-management needs
- Need a unit with active defrost
- Have appropriate indoor or outdoor siting
Check before paying
- Exact article 231209
- Household peak hot-water demand
- Compliant ventilation and air clearances
- Electrical supply and anode provision
- Drains, plumbing and pressure control
- Access to move a 120kg empty appliance
- Support for 340kg filled weight
Buy Stiebel Eltron WWK 222 supply only
Hot Water Outlet supplies the WWK 222 heat-pump hot-water appliance. HWO does not directly carry out installation. This purchasing option suits buyers who will organise their own licensed plumber and electrician.
The supply-only product price does not include labour, plumbing changes, electrical circuits, valves or pressure control, base construction, condensate drainage, safety tray, old heater removal, disposal, lifting and access equipment, certification or site upgrades unless separately and expressly stated.
Independent installer quotations: After purchase, customers in selected metro areas may request HWO’s assistance seeking a separate quotation from independent licensed installers. HWO is not the installing contractor and installation quote availability is not guaranteed.
Delivery in selected metro areas
Selected metro delivery for the WWK 222 may be available in Brisbane, Gold Coast, Sydney and Melbourne service areas, depending on postcode, stock, transport arrangements and unloading access. Delivery is not offered at every address and does not include installation.
Check product availability, freight charge, delivery access, expected delivery timing and your installer’s site assessment before ordering. No specific lead time, installation date or stock status is guaranteed by this description.
WWK 222 Australian manufacturer warranty
Current Stiebel Eltron Australian WWK domestic and commercial schedules
| Covered component | Stiebel Eltron published period |
|---|---|
| Domestic — cylinder and condenser | 5 years, subject to eligibility and exclusions |
| Domestic — sealed refrigeration system | 2 years (compressor, evaporator, valves and associated pipework) |
| Domestic — other electrical components | 2 years |
| Domestic — temperature/pressure relief valve | 1 year |
| Commercial — cylinder and condenser | 2 years, subject to terms |
| Commercial — sealed refrigeration system | 2 years, subject to terms |
| Commercial — electrical components | 2 years, subject to terms |
| Commercial — temperature/pressure relief valve | 1 year |
| Labour during eligible coverage | Included for the listed WWK warranty components, subject to manufacturer conditions |
The WWK warranty PDF describes commencement at installation completion, or two months after manufacture when installation date is unknown. Manufacturer exclusions and service requirements apply. Australian Consumer Law rights are separate and are not displaced by the voluntary manufacturer warranty.
WWK 222 frequently asked questions
Answers about the non-H article 231209, supply-only purchasing and site suitability
Can I purchase the Stiebel Eltron WWK 222 supply only?
Yes. The Hot Water Outlet product is supply-only; arrange licensed plumbing and electrical installation separately.
Does Hot Water Outlet install the WWK 222?
No. Hot Water Outlet does not directly provide installation services. In some selected metro areas it may help customers request independent licensed-installer quotes after purchase.
Is installation included in the product price?
No. The unit is supplied without labour, valve kits, electrical work, base works, condensate drainage, old heater removal or compliance costs.
What article number is the standard WWK 222?
The manufacturer article number is 231209.
Is this the WWK 222H model?
No. The WWK 222H is a different product, article 233209, and has a 1.7kW smart element. This page is for the WWK 222 non-H model.
Does the standard WWK 222 include an electric smart element?
No. The standard WWK 222 does not have the H-model 1.7kW electric booster.
How much hot water does the WWK 222 store?
Its actual nominal cylinder size is 220L.
Why does the manufacturer mention 360 litres at 40°C?
That figure is the nominal quantity of mixed water at 40°C under specific manufacturer assumptions. The tank itself is 220L, not 360L.
How many people is WWK 222 intended for?
The operation manual lists a recommended figure of up to four people, subject to household demand, showers, incoming water temperature and heating windows.
What is the seasonal COP of WWK 222?
The Australian seasonal COP is 3.94, with the published figure based on specified HP2-AU/AS/NZS 4234 conditions.
What is its heat-pump power input?
The Australian datasheet quotes 0.55kW at EN16147/A15. Electrical use changes with conditions and operating stage.
What is the maximum running current for WWK 222?
The May 2024 Australian datasheet quotes 3.18A for the standard non-H model; an electrician must assess actual circuit requirements.
Can WWK 222 be connected to solar PV?
Yes, where a suitable external relay/switch and control integration are fitted. Solar PV panels are not included with the unit.
Does WWK 222 require direct sunlight?
No. The unit uses surrounding air as its heat source and does not need sunlight or rooftop solar hot-water collectors.
Can WWK 222 operate on off-peak electricity?
Depending on available tariff windows, hot-water demand and compliant power arrangements. The impressed-current anode must remain protected as required by Stiebel Eltron.
Does it operate in cold weather?
The stated ambient heat-pump operating range is −5°C to +42°C, and the model includes active defrost. Recovery performance still varies.
What does active defrost do?
It assists in clearing frost from the heat-pump evaporator in suitable cold conditions so heat-pump operation can resume.
Which refrigerant does WWK 222 use?
The manufacturer model-specific datasheet and operation guide specify R134a. Check the actual supplied unit rating plate if revisions change.
How much refrigerant is listed?
The WWK 222 manual lists 0.85kg R134a for this revision.
What are the dimensions?
The height with adjustable feet is 1553–1569mm and diameter is 690mm. Allow additional handling and service clearance.
What does WWK 222 weigh?
The manufacturer lists 120kg empty and approximately 340kg when full. A suitable base and access path are essential.
How loud is the heat pump?
A free-field manufacturer test specifies 45dB(A) at one metre. Nearby surfaces, walls, windows and operating conditions affect perceived noise.
Can it be installed outdoors?
Yes, subject to the manufacturer’s outdoor clearances, a suitable base, condensate handling, plumbing and electrical compliance.
Can it be installed indoors?
Yes, if all conditions are met, including a minimum 13m³ clear space, suitable airflow and drainage. A tiny enclosed cupboard is not necessarily suitable.
What outdoor clearance is required?
The manufacturer advises 500mm either side of the grille, together with the complete model-specific clearance instructions.
Does it require a condensate drain?
Yes. A heat pump produces water condensate during operation, which needs an acceptable route to drainage.
How is water pressure rated?
The Australian datasheet lists 500kPa maximum permissible pressure in its standards context, while the installation manual lists an 850kPa appliance operating-pressure limit. The licensed installer must resolve correct valves and pressure settings using the applicable manual and Australian requirements.
Does the WWK 222 have an anode?
Yes. It uses a maintenance-free impressed-current anode rather than a normal sacrificial rod. Supply and backup arrangements still require attention.
Does its anode work with hard and soft water?
Stiebel Eltron describes the technology as suitable for hard or soft water, but the current installation manual still contains water-quality and conductivity limits.
What is the WWK 222 cylinder warranty?
For domestic use the manufacturer publishes five years for the cylinder and condenser, subject to its conditions.
What is the refrigeration-system warranty?
Domestic sealed refrigeration-system and electrical-component coverage is two years under the published WWK warranty schedule.
How long is the relief valve warranted?
The manufacturer lists one year for the T&P relief valve, subject to the warranty terms.
Is the WWK 222 eligible for STCs?
Potentially, where the exact model, installation date, location, installers and program requirements qualify. Incentives and amounts are not guaranteed.
What if my home needs faster hot-water recovery?
Compare the separate WWK 222H with its 1.7kW smart element or a larger-capacity WWK model. Actual demand and installation suitability determine the choice.
How is WWK 222 different from WWK 302?
WWK 222 is 220L and rated up to 360L mixed water at 40°C; standard WWK 302 is 302L and up to 540L under the same manufacturer assumptions.
Can HWO deliver to Brisbane or the Gold Coast?
Selected metro delivery may be available. Confirm postcode, stock, delivery charges and unloading requirements before purchase.
Can HWO deliver to Sydney or Melbourne?
Selected metro delivery may be available, subject to location, freight and stock. Availability is not guaranteed for every area.
Can HWO help with an independent installation quote?
Customers in selected metro areas may request assistance sourcing quotes from separate licensed installers after purchase. No installer or date is guaranteed.
What should I check before ordering?
Confirm article 231209, the non-H model, household usage, clearance, delivery postcode, installed dimensions, filled weight, electrical supply, pressure control and condensate drainage.
Official Stiebel Eltron manufacturer references
Original equipment manufacturer sources only
- Official Australian WWK 222 / WWK 302 product page
- May 2024 Australian WWK technical datasheet
- WWK operation and installation guide
- Official Australian warranty schedule
- WWK model-specific manufacturer warranty document
Technical values and product features should be checked against the exact unit supplied and its current installation instructions where model revisions or operating contexts differ.
Order WWK 222 — supply only
Confirm that you need Stiebel Eltron WWK 222 article 231209, not WWK 222H. Check household demand, delivery postcode, site access, installation clearances, pressure control, electrical configuration and drainage with appropriately licensed trades. Hot Water Outlet sells the unit; independent licensed trades perform any installation separately.
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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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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