Solid fuel boiler with manual loading DEFRO KDR PLUS 3 A 25 kW

DEFRO KDR PLUS 3 A is a modern heating equipment designed for heating residential houses and country cottages with an area of up to 250 m². The boiler is equipped with an intelligent control system with a PID controller that regulates the air supply to the combustion chamber. The integrated fan controls the fuel combustion rate, maintaining a stable temperature of up to 85°C.

If the temperature exceeds the set parameters, the system automatically reduces the air supply intensity or completely stops it, which increases energy efficiency and safety. The uniform air distribution inside the chamber contributes to the efficient combustion of fuel, ensuring stable operation at various power modes.

The smart boiler control allows connecting two pumps (for the heating system and domestic hot water), as well as a boiler temperature sensor, making it a convenient and functional solution for heating.

Flexible fuel options Thanks to its thoughtful design, DEFRO KDR PLUS 3 A can operate on various types of solid fuel:

Top loading - fine coal.

Bottom loading - wood, coal, eco-pea, briquettes, chips.

Technical features for maximum efficiency

Durable heat exchanger - made of heat-resistant boiler steel P265GH (thickness 6 mm), produced by ArcelorMittal (Poland).

Efficiency up to 83% - achieved through a multi-stage heat exchange system, effectively utilizing the heat of the flue gases.

Advanced thermal insulation - the use of mineral wool reduces heat loss and protects the user from accidental burns.

Automated control - the S3P controller regulates the air supply and manages the operation of two pumps.

Multipoint air injection system - contributes to the uniform combustion of fuel, increases the operation time without refueling, and maintains a stable combustion process.

Easy cleaning and convenience in operation

Movable grate - thanks to the foot pedal, ash and coke are easily removed, and metal teeth break up the slag layer, improving air supply and increasing combustion efficiency.

Thoughtful smoke removal system - the rear flue positioning and built-in damper allow for draft regulation, controlling the combustion process.

Ease of maintenance - convenient door positioning ensures quick cleaning of the heat exchanger and chimney.

Advantages of DEFRO KDR PLUS 3 A

High efficiency (up to 83%) - efficient fuel use and minimal heat loss.

Spacious combustion chamber - long operation without the need for frequent refueling.

Automatic air supply regulation - maintaining a stable temperature and saving resources.

Durable construction - made of certified boiler steel P265GH.

Flexibility in fuel choice - possibility to use wood, coal, briquettes, eco-pea.

Safety and comfort - reliable thermal insulation prevents burns, and the simple cleaning system makes operation easy.