Natural draft boiler ROJEK KTP 20 log boiler 20 kW

ROJEK KTP 20 natural draft boiler for logs – 20 kW

The ROJEK KTP 20 is a robust, hand-fed Natural draft boiler for firewood With a nominal output of 20 kW, the boiler operates without a fan, relying solely on natural chimney draft, and is suitable for the reliable heat supply of single-family homes, workshops, or small commercial units.

Unlike wood gasification boilers, the combustion in the KTP 20 is based on the classic natural draft principle. The combustion air is controlled via adjustable air dampers and a thermostatic draft regulator. This means the boiler technically operates as Log-fired natural draft boiler with simple, durable technology.

Highlights

• ⭐ Natural draft boiler for firewood without a blower
• ⭐ 20 kW heating output for single-family homes and smaller buildings
• ⭐ Robust welded steel construction
• ⭐ Thermostatic draft regulator for power control
• ⭐ EN 303-5 certified solid fuel boiler

Area of ​​application & Target audience

The ROJEK KTP 20 is suitable for buildings with medium heating requirements. Typical applications include:

• Private households and single-family homes
• Workshops and agricultural buildings
• Renovation projects with existing chimney systems
• Wood heating systems with buffer storage

The operation uses untreated firewood with a recommended maximum wood moisture content of 20%.

Everyday benefits

The natural draft boiler operates without complex electronics or fan technology. This makes the heating system particularly robust, low-maintenance, and durable. Output is regulated mechanically via the thermostatic draft regulator, which automatically controls the air supply.

The large combustion chamber allows for longer burning times, which significantly increases comfort in daily heating operation.

Technology & equipment

The boiler consists of a robust welded steel construction with a water-cooled grate. Combustion takes place conventionally via natural draft through the chimney.

• adjustable primary and secondary air
• thermostatic draft regulator RT3
• integrated pressure gauge and thermometer
• After-cooling loop to protect against overheating
• Connection flow/return G 2"

The required chimney draft is approximately 8–12 Pa.

Efficiency & Environment

The boiler meets the requirements of the European standard. EN 303-5 for solid fuel boilers.

• Efficiency: approx. 75%
• Energy efficiency class: A+
• Exhaust gas temperature at rated power: approx. 220–300 °C

For efficient and low-emission operation, combination with a buffer storage system is recommended.

Technical data

Manufacturer	ROJEK
Model	KTP 20
Boiler type	Log-fired natural draft boiler
Rated power	20 kW
Minimum performance	12 kW
combustion chamber volume	47.9 liters
Water volume	98 liters
Max. log length	33 cm
Flue pipe diameter	159 mm
Max. operating pressure	2 bar
Max.Operating temperature	90 °C
Weight	261 kg
Energy efficiency class	A+

Scope of delivery

• ROJEK KTP 20 boiler
• Operating instructions
• Thermostatic pull regulator RT3 with chain
• Heating system outlet valve 1/2"
• Side ceramics
• alignment screws

Assembly and safety instructions

Installation must be carried out by a qualified heating contractor. A safety group and a correctly installed after-cooling loop are required.

Only dry firewood may be used as fuel. The use of liquid fuels for kindling is prohibited.

FAQ

Is the ROJEK KTP 20 a wood gasifier?

No. The KTP 20 operates as a classic natural draft boiler for logs and not according to the wood gasification principle.

Does the boiler require electricity?

Not for the boiler operation itself. Electricity is only needed for the heating circulation pump.

What length of wood can be used?

The maximum log length is approximately 33 cm.

Is a buffer storage tank necessary?

Not technically required, but recommended for efficient operation.

What chimney draft is required?

The recommended chimney draft is between 8 and 12 Pascals.

What is the optimal wood moisture content?

A residual moisture content between 12% and 20% is recommended.