Defro Firewood Plus 24 kW natural draft boiler

2025-04-16T12:24:17+02:00

Vendor: Defro
Type: Solid fuel boiler
Price: 2797.00

The Defro Firewood Plus 24 kW This is a high-performance natural draft boiler for firewood. With an efficiency of 92.5%, electronic primary air control, and an integrated safety heat exchanger, it offers an efficient solution for larger single-family homes or apartment buildings.

Highlights/Advantages

⭐ 92.5% efficiency – maximum fuel utilization
⭐ Energy efficiency class A+ – modern wood heating with high efficiency
⭐ Integrated safety heat exchanger – suitable for closed systems
⭐ Electronic primary air control – precise and convenient regulation
⭐ Multiple connections to the chimney are possible – flexible system planning

Detailed description

Area of ​​application & Target audience

The Defro Firewood Plus 24 kW is a natural draft boiler for burning logs (hardwood, residual moisture 12–20%). With its nominal output of 24 kW, it is suitable for larger single-family homes, apartment buildings, or buildings with increased heating requirements.

The secondary air supply, adjustable on both sides, allows for flexible setup even in confined spaces.

Everyday benefits

The electronic control system automatically regulates the primary air supply. Additionally, the boiler circulation pump and an optional induced draft fan can be controlled.

Large loading doors facilitate the feeding of logs up to 390 mm in length. An integrated sight glass allows for visual monitoring of the gasifier flame.

Technology & equipment

The boiler body is made of high-quality steel. The factory-installed safety heat exchanger allows operation in closed heating systems.

The required delivery pressure is 0.28 mbar. The boiler is suitable for multiple connections to a common chimney.

Efficiency & Environment

With a standard efficiency of 92.5%, the Firewood Plus 24 kW achieves energy efficiency class A+.

The recommended minimum buffer storage capacity is 1300 liters to ensure efficient and low-emission operation.

compatibility & System integration

The exhaust connection has a diameter of 178 mm.

The flow and return lines are made with 1½" (IG) threads.

The power supply is provided via 230 V/50 Hz for the electronic control.

Suitable accessories such as buffer tanks, thermal relief valves, safety groups or hydraulic components can be found in the product range at gemashop.de.

Technical data

feature | Value
Manufacturer | DEFRO
Model | Firewood Plus 24
Product type | Natural draft boiler
Rated power | 24 kW
fuel | Firewood (hardwood 12–20%)
efficiency | 92.5%
Energy efficiency class | A+
boiler weight | 429 kg
Exhaust gas temperature | 154 °C
Exhaust gas mass flow | 19.0 g/s
CO₂ content | 13.1%
Required delivery pressure | 0.28 mbar
Exhaust connection | Ø 178 mm
Flow/Return | 1½" internal thread
Flow temperature min./max. | 75/90 °C
Minimum return temperature | 65 °C
Minimum buffer capacity | 1300 l
power supply | 230 V/50 Hz
Dimensions (W x D x H) | 580 x 655 x 1335 mm

Scope of delivery

Defro Firewood Plus 24 kW natural draft boiler

Analog boiler thermometer

Electronic fire draft regulator

Chain for the fire regulator

Short-circuit valve

Vertical grate insert

Wirbulators

Cleaning tool

Operating and assembly instructions

Assembly & Safety instructions

Installation and commissioning must only be carried out by a qualified specialist company.

To ensure efficient and low-emission operation, a buffer storage tank with a capacity of at least 1300 liters must be provided. The applicable national regulations regarding the exhaust system and hydraulic integration must be observed.

FAQ

1. For which buildings is the 24 kW version suitable?
For larger single-family homes, multi-family homes or buildings with higher heating requirements.

2. What log length is suitable?
For the 24 kW version, the recommended log length is 330–390 mm.

3. Is operation in a closed heating system possible?
Yes, the integrated safety heat exchanger allows operation in a closed system.

4. Is a buffer storage tank required?
Yes, the recommended minimum capacity is 1300 liters.

5. Can an induced draft fan be connected?
Yes, an optional induced draft fan can be controlled via the electronic control system.

6. What type of power supply is required?
230 V/50 Hz for electronic control.

Conclusion

The Defro Firewood Plus 24 kW is a powerful natural draft boiler with high efficiency and robust construction. A reliable solution for economical heating with logs when heat demand is higher.