WWK 222/222H and WWK 302/302H

  • German engineered
  • Designed for diverse climate conditions in NZ
  • Sophisticated tank insulation to ensure minimal heat loss
  • Quiet operation with new encased compressor design
  • Suitable for hard or soft water areas with maintenance free current impressed anode
  • Operates energy efficiently 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
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Product Overview

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 New Zealand market. Not only are they great looking but there are many new innovations incorporated in the sophisticated design. 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.

Available at:
Or your local plumbing supply store.

Product Details

High-quality design from STIEBEL ELTRON.

  • German engineered, designed for New Zealand 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

Technical Data

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) 3.38 3.36
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
Approvals WaterMark Lic No. WMKA00301, AS3498
Weight (filled with water) 340 kg 437 kg
Average sound pressure level at 1m distance, free field (EN 15036) 45 dB(A) 45 dB(A)


File Category Type Download
WWK Data SheetData SheetPDF
2.16 MB
WWK 222 & 302 Operation and InstallationOperation and Installation GuidePDF
9.35 MB
WWK Operation & Installation Guide Operation and Installation GuidePDF
9.29 MB
WWK 222(H) / WWK 302(H) WarrantyWarrantyPDF
212.58 kB
STIEBEL ELTRON Tech Line Drawing WWK222Technical DrawingPNG
603.19 kB
STIEBEL ELTRON Tech Line Drawing WWK302Technical DrawingPNG
635.13 kB


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. 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.

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

2.3 Amps on 240 Volts

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

Our heat pumps have an encased compressor design to reduce noise. They are operating at 46 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.

7. 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.

10. 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.

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