Solid fuel boiler with manual loading DEFRO KDR PLUS 3 A 12 kW

DEFRO KDR PLUS 3 A – a long-burning solid fuel boiler

The DEFRO KDR PLUS 3 A boiler is designed for efficient heating of private houses and cottages with an area of 120 m². This is a modern generation of heating systems equipped with intelligent electronic control with a PID controller. Thanks to the blower fan, the controller regulates the air supply to the combustion zone, controlling the fuel combustion rate and maintaining a stable boiler temperature (up to 85°C).

If the system temperature exceeds the set value, the controller automatically reduces or completely stops the air supply, increasing safety and efficiency. The distributed air flow in the combustion chamber optimizes the combustion process, ensuring maximum performance in different power modes.

The control system allows connecting two pumps – for heating and hot water supply (GVS), as well as a boiler temperature sensor.

Flexibility in fuel choice

Thanks to the thoughtful design, DEFRO KDR PLUS 3 A supports the combustion of various types of solid fuel:

Top loading – fine coal (shtyb).

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

Design for maximum efficiency

High-strength heat exchanger – made of heat-resistant boiler steel P265GH (thickness 6 mm), manufactured at the Polish plant ArcelorMittal.

Efficiency up to 83% – achieved through a multi-stage heat exchanger that efficiently absorbs the heat of flue gases.

Reliable thermal insulation – mineral wool is installed between the boiler body and the heat exchanger, preventing heat loss and protecting the user from accidental burns.

Electronic control – the S3P controller regulates the air supply and controls two pumps for the circulation of the heat carrier.

Multi-point air supply – contributes to even fuel combustion, increases operating time, and improves combustion process stability.

Easy cleaning and ease of operation

Movable grate – facilitates the removal of ash and coke from the grates with a special foot pedal. When pressed, metal teeth are extended, breaking the slag crust, improving air passage, and increasing combustion efficiency.

Thoughtful flue gas removal system – flue gases are removed through the rear chimney, and draft adjustment is carried out with a built-in damper, allowing control of combustion intensity.

Ease of maintenance – the boiler design and convenient location of the firebox doors simplify the cleaning of the heat exchanger and flue.

Key advantages of DEFRO KDR PLUS 3 A

High efficiency (up to 83%) – efficient fuel use.

Large combustion chamber – allows the boiler to operate for many hours without reloading.

Automatic air supply adjustment – temperature stability and fuel savings.

Durable construction – made of certified boiler steel P265GH.

Flexibility in fuel choice – the ability to use wood, coal, briquettes, and eco-pea.

Safety and convenience – thermal insulation prevents burns, and the convenient cleaning system simplifies maintenance.

DEFRO KDR PLUS 3 A – a reliable and economical choice for your home! Comfort, durability, and efficiency in every detail!