Description
| 18/25 KKZ 21 | 18/25 KKZ 42 | |
| Energy boiler efficiency | A | A |
| Energy class for preparing hot water | A | A |
| Min.-Max power | 4,9 – 19,6 / 5,1 – 25,5* | 4,9 – 19,6 / 5,1 – 25,5* |
| Efficiency (%) | 108,4 | 108,4 |
| Temperature support (°C) | 10-80 | 10-80 |
| Maximum pressure (bar) | 0,5 – 3 | 0,5 – 3 |
| Expansion vessel capacity (l) | 12 | 12 |
| Hot water temperature in preparation (°C) | 45 -65 | 45 -65 |
| Minimum hot water content (l/min) | 0,1 | 0,1 |
| Hot water content (delta t 30°C) (l/m) | 15 | 18,5 |
| Minutes.- Max. hot water pressure (bar) | 0,3 – 10 | 0,3 – 10 |
| Power supply (V/Hz) | 230/50 | 230/50 |
| Protection Class (IP) | IPX4D | IPX4D |
| Class No x | 5 | 5 |
| Chimney connections (mm) | 60/100 80/125 80/80 | 60/100 80/125 80/80 |
| Mass without water (kg) | 56,7 | 63 |
| Dimensions (a,p,hg) (mm) | 892 x 470 x 502 | 892 x 470 x 502 |
