Stiebel Eltron WWK Heatpump Range - Enter Energy & Water
Stiebel Eltron WWK Heatpump Range - Enter Energy & Water

Stiebel Eltron WWK Heatpump Range

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WWK 222/222H and WWK 302/302H

WHAT REBATES ARE YOU ELIGIBLE FOR ? Give us a call to find out these are dependant upon post code & Certificate Price.

STIEBEL ELTRON's latest range of hot water heat pumps, the WWK 222|222H and WWK 302|302H, set a new benchmark for heat pumps in the Australian market. Not only are they great looking but there are many new innovations incorporated in the sophisticated design. The great new features include a maintenance free current impressed anode, active defrost for operation down to minus 5°C, the option to connect the heat pumps with solar PV systems and the ability to transport them horizontally.


  • German engineered
  • Designed for Australian conditions
  • 17% lower heat loss due to improved tank insulation compared to the previous model
  • Quiet operation with new encased compressor design
  • Suitable for hard or soft water areas with maintenance free current impressed anode
  • Operates down to minus 5°C, ideal for cold climates
  • Unique roll bond condensor technology for optimal heat transfer
  • Active defrost function maintains operation in cold climates automatically
  • Single piece design for ease of installation
  • Ideal to operate with solar PV system



Model number WWK 222 and WWK 222H WWK 302 and WWK 302H
Power consumption at (EN16147/A15) 0.55 kW 0.55 kW
Power consumption smart element H-model only: 1.7 kW H-model only: 1.7 kW
Rated voltage 240 V 240 V
Rated current 10 Amp 10 Amp
Phases 1/N/PE 1/N/PE
Electrical Installation As per AS/NZS3000
Installation requirements AS/NZS3500.4.2 & local requirements
Type of installation Outdoor or Indoor Outdoor or Indoor
Minimum space requirements

Indoor - 13m3
Outdoor - 500mm either side of the grill.
See installation guide

Cylinder capacity 220 Litres 302 Litres
Cylinder material Enamelled Steel
Permissible operating pressure 800 kPa 800 kPa
Seasonal coefficient of performance (COP) 3.94 3.58
Application range -5 to +42°C -5 to +42°C
Air flow rate 550 m3/h 550 m3/h
IP Rating IP24 IP24
Refrigerant R134a R134a
Refrigerant capacity 0.85 kg 0.85 kg
Height 1553-1569 mm (adjustable feet) 1921-1937 mm (adjustable feet)
Diameter 690 mm 690 mm
Weight (empty) 120 kg 135 kg
Weight (filled with water) 340 kg 437 kg
Approvals WaterMark Lic No. WMKA00301, AS3498


High-quality design from STIEBEL ELTRON.
  • German engineered, designed for Australian conditions
  • Market leader in heat pump technology since 1976
  • 220 litre tank with high volume of hot water can deliver 360 L of 40°C shower temperature water at a cold water temperature of 20°C (302 litre tank delivers 540 litres)
  • Suitable for hard or soft water areas with maintenance free current impressed anode
Installation flexibility
  • Can be installed outdoors or indoors, indoor installation requires 13m3 of clear space
  • Single piece design for ease of installation
  • Active defrost function to assist operations in cold climates
  • Operates in cold climates down to minus 5°C
Energy efficient
  • Energy efficient operation saves up to 74% on hot water energy use*
  • Low power draw at only 2.3 Amps
  • Can operate on extended off-peak power and timers where available


1. What is the difference between the WWK 222/302 heat pumps and the H-models?

The WWK 222/302 H hot water heat pumps have a smart element situated in the top of the hot water cylinder.  This smart element will switch on along with the heat pump function when a high volume of hot water is drawn off from the hot water tank. This smart element will assist the heat pump to heat approximately the top 80 litres. This smart element function is designed to aid hot water recovery for high use of hot water.

2. What is the active defrost feature on the STIEBEL ELTRON hot water heat pumps?

The WWK 222/302 (H) hot water heat pumps have an active defrost function that switches on when the frost monitor detects a build-up of hoar frost at the evaporator. When frost is detected, it will switch the fan off but will keep the compressor running. Hot vapor is directed to the evaporator and the condensor is shut off, this hot gas will begin to actively defrost the evaporator.

3. Do you manufacture a heat pump with an element?

Yes, the H-models, WWK 222 H and WWK 302 H, are heat pumps with smart elements. These models have a 1.7 kW element that when engaged will heat approximately the top 80 litres of the tank.

4. Can it operate on Tariff 33 in QLD and Off Peak 2 in NSW?

Yes, these tariffs are ideal for maximum savings.

5. How can the heat pump create hot water in the cold without an element?

The heat pumps have an active defrost function that can control any icing that occurs at lower air temperatures. The active defrost function will remove any hoar frost that occurs at the evaporator and then reverts back to hot water generation mode.

6. What is the current draw of the hot water heat pumps?

2.3 Amps on 240 Volts

7. Does a heat pump make a lot of noise when operating?

The new heat pumps have an encased compressor design to reduce noise. They are operating at only 45 dB. Heat pumps do make a sound when they are operating which is the sound of the compressor and fan. The noise from a heat pump is dependent on a number of factors, we encourage our customers to read the operating and installation guide to also take into account the positioning of the heat pump when installing.

8. How often should the condensate drain be checked on the hot water heat pumps?

The condensate drain and the top of the condensate pan should be checked at least monthly to remove any blockages that may have occurred via debris.

9. How big is the tank of the WWK 222 hot water heat pump?

220 litres.

10. How big is the tank of the WWK 302 hot water heat pump?

302 litres.

10. Can the STIEBEL hot water heat pumps be installed indoors?

Yes, these heat pumps have been designed to be installed either indoors or outdoors. A clear space of 13 m3 is required for indoor installations to allow for the cold air from the refrigeration system to diffuse.

11. Can the WWK be used for in-slab and radiator hydronic heating?

The WWK range of heat pumps are not designed for room heating applications. STIEBEL ELTRON have a range of air source hydronic heat pumps in addition to geothermal hydronic heat pumps designed for hydronic heating.


Rebates (National)

Hot Water Rebates Explained

Rebates and financial incentives are offered Australia-wide at a Federal and State level depending on the type of water heater that is being replaced and what type of new system is being installed. It is extremely beneficial that you have a good understanding of what rebate is offered to achieve the best savings possible.

REC Rebate Scheme

As of January 1st 2011, there have been changes made to the existing rebate scheme (REC) that was previously in operation.
A REC from a heat pump installed before the 31st of December 2010 has been reclassified as an LREC, or Large-scale generation certificate (LGC).
A REC from heat pumps installed on or after the 1st of January 2011 has since been known as an SREC, or Small-Scale Technology Certificates (STC).

What is an STC exactly?

Small-scale Technology Certificates (STCs) are an environmental type of currency which are issued after installation of water heating, solar power and any other renewable energy technology which helps to reduce greenhouse gas emissions.
Small-scale Technology Certificates prices are market-based and will fluctuate depending on supply and demand. There are a number of STC trading companies that you can compare pricing through.

STC information for the STIEBEL ELTRON hot water heat pumps*

WWK 222 & WWK 222 H 25 26 29 31 31
WWK 302 24 25 28 31 30
WWK 302 H 24 25 28 30 30

*Please note: The number of STCs within each zone are subject to AS/NZS standards or methodology change and were accurate as at 01 July 2017. To confirm current STC numbers on the STIEBEL ELTRON heat pump range please visit the Australian Government Office of Clean Energy Regulator website. STCs are subject to meeting eligibility and conditions.

Please note that the register of solar water heaters version 32 has been released

The Office of Renewable Energy Regulator has released the Update to the Register of Solar Water Heaters (Version 32). To see current STC numbers based on your postcode please visit


Rebates (Victoria)

The Victorian Government currently offers a number of hot water rebates which are dependent on the location of Victorian households and which type of hot water system is being replaced.

Hot water rebates are offered to provide domestic households additional incentives to replace their existing hot water systems with more energy efficient water heaters. The hot water rebates make purchasing and installing new hot water systems more affordable, and help households benefit from the long-term energy and cost savings these new models offer.

Metropolitan and Regional

The Victorian Government offers a rebate to assist households in Metropolitan Melbourne and regional areas to switch to a solar hot water system or heat pump. For more information on rebates in Victoria, please visit


A VEEC is a Victorian Energy Efficiency Certificate and is awarded for installing a heat pump to replace a less-efficient electric water heater. 1 VEEC is equivalent to 1 tonne of CO2 abated by a prescribed activity.

The below table can be used as a guide for the number of VEECs for a STIEBEL ELTRON heat pump. To find out the number of VEECs you are eligible for in your area.

please view the online calculator

Model Metropolitan Regional
WWK 222 & WWK 222H 45 47
WWK 302 & WWK 302H 44 46


NOTE: STC & VEEC Rebate prices are calculated based on location & You are only eligible for the VEEC rebate if you are replacing an electric hot water service in Victoria. A sample postcode in Victoria has been used to calculate the prices displayed as the price difference is not a significant amount 



Data Sheet
Operation and Installation Guide
Technical Drawing