WWK 221 electronic - Boiler STIEBEL ELTRON - Free user manual and instructions
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| Product Type | Heat pump water heater |
| Model | WWK 221 electronic |
| Brand | Stiebel Eltron |
| Tank Capacity | 221 liters |
| Dimensions (H x D) | Approx. 1310 x 610 mm |
| Weight | Approx. 90 kg |
| Power Supply | 230 V AC, 50 Hz |
| Heating Capacity | 2.2 kW (heat pump) / 2.0 kW (electric backup) |
| Energy Efficiency Class | A+ |
| Max Water Temperature | 60 °C |
| Refrigerant | R134a, 1.0 kg |
| Control | Electronic with LCD display |
| Modes | Eco, Boost, Away, Manual |
| Installation | Indoor, floor-standing |
| Connection | G 1 inch cold water inlet / hot water outlet |
| Maintenance | Annual inspection of anode and refrigerant circuit |
| Cleaning | Wipe with damp cloth; do not use abrasive cleaners |
| Safety Features | Overheat protection, pressure relief valve, frost protection |
| Spare Parts Availability | Authorized service centers; easy to replace components |
| Warranty | 2 years (manufacturer warranty) |
Frequently Asked Questions - WWK 221 electronic STIEBEL ELTRON
How do I reset the WWK 221 electronic boiler?
To reset, press and hold the reset button on the control panel for 3 seconds. If the issue persists, turn off the power for 10 minutes and restart.
What does the error code E2 mean?
Error code E2 indicates a sensor fault. Check the temperature sensor connections and contact service if needed.
How often should I clean the air filter?
Clean the air filter every 3 months by rinsing with water and drying thoroughly before reinserting.
Can I use the boiler without mains water pressure?
No, the boiler requires a minimum water pressure of 0.2 MPa (2 bar) to operate correctly.
What is the recommended temperature for optimal efficiency?
Set the temperature to 50 °C for a balance between efficiency and hot water comfort. Higher temperatures increase energy use.
How do I drain the water heater?
Turn off power, close the cold water inlet, attach a hose to the drain valve, and open the valve. Open a hot water tap to allow air in.
Is the boiler suitable for outdoor installation?
No, the WWK 221 electronic is designed for indoor installation only in a frost-free room.
What refrigerant is used?
The system uses R134a refrigerant. Service must be done by certified technicians.
How can I reduce noise from the heat pump?
Ensure the boiler is on a solid level surface and not in contact with walls. Clean the fan and check for loose parts.
Where can I find spare parts?
Spare parts are available through Stiebel Eltron authorized service centers. Provide the model number and serial number.
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USER MANUAL WWK 221 electronic STIEBEL ELTRON
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Product information
Brand : STIEBEL ELTRON
Model : WWK 221 electronic
Category : Boiler