These are energy-efficient solid fuel boilers with natural draft. High corrosion resistance and durability are ensured by a reliable heat exchanger, which is made of cast iron sections with increased cross-sections, assembled with steel nipples. The grates are water-cooled, which helps prevent burnout. The heat exchanger is designed with a two-pass design on the flue gas side.
Can be equipped with a pellet burner from 5 kW to 30 kW, price 13,500 UAH
| Name | Unit | CALDO 03 A/C | CALDO 04 A/C | CALDO 05 A/C | CALDO 06 A/C |
| Number of sections | pcs. | 3 | 4 | 5 | 6 |
| Nominal thermal power / coal | kW | 15-17 | 24-27 | 31-34 | 38-41 |
| Nominal heating power / firewood | kW | 12-14 | 18-20 | 25-27 | 30-33 |
| Boiler class according to EN 303-5 | - | 1 |
| Maximum operating temperature | °C | 90 |
| Burn time of the bookmark/coal | h | >4 |
| Burning time of the bookmark/firewood | h | >2 |
| Cooling water pressure for the additional cooling circuit (Caleffi valve) | bar | 2-6 |
| Max. working pressure | bar | 3 |
| Diameter of coolant connections | | 2'' |
| Diameter of safety valve connections | | 1/2'' |
| Volume of water | l | 16.3 | 20.3 | 24.3 | 28.2 |
| Minimum chimney draft | mbar | 0.12 | 0.14 | 0.17 | 0.2 |
| Diameter of the chimney connection | mm | 150 |
| Flue gas temperature | °C | 190-260 |
| Internal dimensions of the firebox, WxH | mm | 300x380 |
| Firebox depth | mm | 245 | 345 | 445 | 545 |
| Weight | kg | 177 | 207 | 237 | 267 |
