DEL 18/21/24 Plus - Boiler STIEBEL ELTRON - Free user manual and instructions
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| Product type | Electric instantaneous water heater |
| Compatible models | DEL 18, DEL 21, DEL 24 Plus |
| Electrical power | 18 kW / 21 kW / 24 kW depending on model |
| Power supply | 400 V three-phase (3~) |
| Maximum current | 26 A (18 kW), 30 A (21 kW), 35 A (24 kW) |
| Minimum water pressure | 0.4 bar |
| Maximum water pressure | 10 bar |
| Min. water flow for activation | 3.5 L/min |
| Adjustable outlet temperature | 20 °C to 60 °C |
| Dimensions (H × W × D) | 470 × 225 × 115 mm |
| Net weight | 4.5 kg |
| Water connections | G 1/2" male |
| Protection rating | IP24 |
| Control type | Electronic with digital display |
| Main functions | Temperature regulation, anti-scale protection, overheat safety |
| Maintenance | Periodic descaling depending on water hardness |
| Spare parts available | Heating element, sensors, electronic board, valves |
| Repairability | Repairability score: 8.8/10 |
| Manufacturer's warranty | 2 years (parts and labor) |
| Standards | CE, NF |
Frequently Asked Questions - DEL 18/21/24 Plus STIEBEL ELTRON
What is the difference between the DEL 18, DEL 21 and DEL 24 Plus models?
The difference lies in the electrical power: 18 kW, 21 kW or 24 kW. The higher the power, the greater the possible hot water flow rate. The Plus model incorporates advanced electronic regulation.
What cable section and circuit breaker are required for installation?
For an 18 kW model: 6 mm² cable and 32A circuit breaker. For 21 kW: 10 mm² and 40A. For 24 kW: 10 mm² and 40A. Installation must be carried out by a qualified electrician.
Can I install the water heater myself?
No, installation must be performed by a professional (electrician and plumber) in accordance with current standards. Incorrect installation can lead to electrical and leakage risks.
How to adjust the water temperature?
Use the buttons or control panel to adjust the desired temperature between 20 °C and 60 °C. The digital display shows the set temperature. An indicator lights up when the device is heating.
What to do if the water does not heat or the flow is insufficient?
First check that the power supply is activated and that the circuit breaker has not tripped. Ensure the water pressure is above 0.4 bar. If the problem persists, contact after-sales service.
How to maintain the water heater to prevent limescale?
Regular descaling is recommended (every 1 to 2 years depending on water hardness). Use a suitable descaling product following the manufacturer's instructions. You can also install a water softener upstream.
What is the recommended water pressure?
The operating pressure must be between 0.4 bar and 10 bar. Below 0.4 bar, the device does not turn on. Above 10 bar, install a pressure reducer.
The water heater makes noise, is that normal?
A slight heating or water circulation noise is normal. If the noise is abnormal (whistling, cracking), it may indicate limescale build-up or a flow problem. Perform descaling.
What are the protection and safety ratings?
The device is certified IP24, protected against water splashes. It has overheat protection, a temperature limiter and flow control to prevent dry running.
Where to find spare parts and how to repair the device?
Spare parts are available from authorized dealers Stiebel Eltron or online. The repairability score is 8.8/10, indicating good ease of repair. For complex repairs, call a professional.
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USER MANUAL DEL 18/21/24 Plus STIEBEL ELTRON
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Product information
Brand : STIEBEL ELTRON
Model : DEL 18/21/24 Plus
Category : Boiler