Defro Firewood Plus 19 kW natural draft boiler

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

Vendor: Defro
Type: Solid fuel boiler
Price: 2629.00

The Defro Firewood Plus 19 kW This is a high-performance natural draft boiler for firewood. With an efficiency of 92.4%, electronic primary air control, and an integrated safety heat exchanger, it offers efficient and reliable heating technology for single-family and multi-family homes.

Highlights/Advantages

⭐ 92.4% efficiency – efficient heat recovery from the exhaust gases
⭐ Energy efficiency class A+ – modern and economical wood heating
⭐ Integrated safety heat exchanger – suitable for closed heating systems
⭐ Electronic primary air control – precise combustion control
⭐ Multiple connections to the chimney are possible – flexible installation

Detailed description

Area of ​​application & Target audience

The Defro Firewood Plus 19 kW is a natural draft boiler for burning logs (hardwood, residual moisture 12–20%). With a nominal output of 19 kW, it is particularly suitable for larger single-family homes, apartment buildings, or renovation projects with higher heating requirements.

The secondary air supply is adjustable on both sides, making it possible to place the unit close to a wall.

Everyday benefits

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

Large loading doors allow for convenient loading of logs up to 340 mm in length. An integrated sight glass allows visual monitoring of the gasifier flame.

Technology & equipment

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

The required delivery pressure is 0.24 mbar. The boiler is suitable for multiple connections to a common chimney.

Efficiency & Environment

With a standard efficiency of 92.4%, the Firewood Plus 19 kW achieves energy efficiency class A+.

The recommended minimum buffer storage capacity is 1000 liters to ensure efficient and low-emission operation.

compatibility & System integration

The exhaust connection has a diameter of 159 mm.

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

The electronic control system is powered by a 230 V/50 Hz supply.

Suitable accessories such as buffer tanks, thermal relief valves, safety groups and hydraulic connections can be found in our product range. gemashop.de.

Technical data

feature | Value
Manufacturer | DEFRO
Model | Firewood Plus 19
Product type | Natural draft boiler
Rated power | 19 kW
fuel | Firewood (hardwood 12–20%)
efficiency | 92.4%
Energy efficiency class | A+
boiler weight | 370 kg
Exhaust gas temperature | 153 °C
Exhaust gas mass flow | 15.0 g/s
CO₂ content | 12.7%
Required delivery pressure | 0.24 mbar
Exhaust connection | Ø 159 mm
Flow/Return | 1½" internal thread
Flow temperature min./max. | 75/90 °C
Minimum return temperature | 65 °C
Minimum buffer capacity | 1000 l
power supply | 230 V/50 Hz
Dimensions (W x D x H) | 530 x 605 x 1230 mm

Scope of delivery

Defro Firewood Plus 19 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 comply with emission and efficiency requirements, a buffer storage tank with a capacity of at least 1000 liters must be provided. National regulations regarding hydraulic integration and the exhaust system must be observed.

FAQ

1. For which buildings is the 19 kW version suitable?
For larger single-family homes or smaller multi-family homes with higher heating requirements.

2. What log length is suitable?
For the 19 kW version, the recommended log length is 300–340 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 1000 liters.

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

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

Conclusion

The Defro Firewood Plus 19 kW is an efficient natural draft boiler with a robust design and modern control technology. A reliable solution for powerful and economical heating with firewood.