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STIEBEL ELTRON DHB-E18/21/24LCD vs GERMAN POOL CEX21 Comparison
Side by side
DHB-E18/21/24LCD CEX21
- DHB-E18/21/24LCD offers selectable 18/21/24 kW ratings at 400 V; CEX21 offers 18/21 kW settings and requires a three-phase supply.
- CEX21 is smaller and lighter: 294 × 177 × 108 mm and 2.8 kg net, versus DHB-E18/21/24LCD at 466 × 225 × 116 mm and 3.2 kg.
- DHB-E18/21/24LCD specifies an LCD display, childproof temperature limits and solar-preheated water compatibility; these features are not specified for CEX21.
- DHB-E18/21/24LCD is listed as a centralized unit; CEX21 explicitly supports single-point and multipoint supply and under-ceiling installation.
- DHB-E18/21/24LCD has a 2-year warranty; CEX21 has a conditional 3-year warranty, with free on-site and parts replacement services in the first year.
| 項目/item | DHB-E18/21/24LCD | CEX21 |
| Power ratings and settings | 18/21/24 kW at 400 V; 16.2/19/21.7 kW at 380 V | Settings: 18/21 kW. Rated power consumption: 16.2–19.4 kW at the 18 kW setting; 19–22.6 kW at the 21 kW setting |
| Supply phase requirement | Not specified | Three-phase electric power only |
| Voltage | 380 V and 400 V, as listed with power ratings | 380–415 V |
| Current, listed as “Electric Power” | Not specified | 23.4–28.8 A at the 18 kW setting; 28.8–31.4 A at the 21 kW setting |
| Required cable size | Not specified | 4 mm² |
| Control system | Full electronic control | |
| Temperature range | OFF; 20–60°C | 20–60°C |
| Fine temperature adjustment | 0.5°C increments from 35°C or 43°C, as stated | Not specified |
| Temperature display | LCD | Not specified |
| Dimensions, H × W × D | 466 × 225 × 116 mm | 294 × 177 × 108 mm |
| Weight | 3.2 kg | 2.8 kg net |
| Net weight when filled with water | Not specified | 3.1 kg |
| Gross weight with packaging | Not specified | 3 kg |
| Flow-rate specifications | 5.2–13.8 L/min, dependent on model | Min–max flow: 2–8 L/min. Stated hot water output: 10.7 L/min at 21 kW with an 8 L/min flow limiter, at Δt = 28 K, for example 12°C to 40°C |
| Minimum starting flow and starting volume | Minimum flow: 2.5 L/min; starting volume: ≥2.5 L | Not specified |
| Working pressure | 10 bar | Not specified |
| Testing pressure | Not specified | 10 bar |
| Incoming water pressure limitation | Not specified | Should not exceed 0.6 MPa under normal working conditions. Above 0.6 MPa, a separate pressure control device is required; repair service is withheld until it is installed |
| Water inlet size | 15 mm, G1/2″ | Not specified |
| Ingress protection rating | IP25 | |
| Heating system | Bare wire heating system with pressure-tested copper casing | Instantaneous heating |
| Hot water supply configuration | Centralized unit | Single-point and multipoint supply |
| Under-ceiling installation suitability | ❌ Not specified | ✅ Suitable |
| Water hardness compatibility | Hard and soft water | Not specified |
| Childproof temperature limits | 43°C / 50°C / 55°C / 60°C | Not specified |
| Electronic safety system | ✅ Air detection and temperature cut-off device | ❌ Not specified |
| Solar-preheated water compatibility | ✅ Compatible | ❌ Not specified |
| Optional wireless remote control | ✅ FFB4 comfort remote available separately | ❌ Not specified |
| Energy-efficiency statements | Key features: up to 30% energy savings compared with traditional cylinder water-heating systems. Important note: the comparison is with hydraulic instantaneous water heaters and depends on usage pattern | Instantaneous heating heats water only when needed to minimize energy waste |
| Certifications and approvals | Not specified | VDE approval; CB/ISO; VDE/EMC; VDE/GS |
| Colour | Not specified | White |
| Country of origin | Germany | |
| Warranty | 2 years | 3 years on all parts for purchases after 1 November 2015, including free on-site and parts replacement services in the first year |
The above information is analyzed and compared by AI, and the content may not be 100% accurate. If you have any questions, please contact our sales staff or the brand for inquiries.