BIASI RECUPERA DGT NOx 24 S

Product detailed description

This condensing gas boiler is designed for residential and light commercial applications. It is commonly installed in domestic properties, small apartment blocks, and similar buildings where space is limited. The unit supports both heating and domestic hot water production and is compatible with a variety of pipe layouts and chimney configurations. Installers often work with existing systems that require minimal modifications to accommodate the boiler’s requirements.

The BIASI RECUPERA DGT NOx 24 S is ideal for integration into systems with conventional flue arrangements, including those using aluminium or combined flue systems. It supports direct control of up to two heating zones and is suitable for use with older turbo boilers in mixed installations. Its modular range of 1:3 allows for flexible operation across varying load demands, and the equithermal regulation ensures stable temperature control in the heating circuits.

Technical parameters

Thermal output TUV (80/60°C)	24.1 kW
Thermal output UK (80/60°C)	25 kW
Minimum thermal output UK	7.5 kW
Efficiency at 100% load (30/50°C)	96.5 %
TUV flow rate ΔT=25°C	13.7 l/min
Height	700 mm
Width	400 mm
Depth	290 mm
Packaging height	790 mm
Packaging width	480 mm
Packaging depth	375 mm
Gross weight	37 kg
EAN	8058045652359
Code	10312.0220.0
Brand	Biasi

The boiler’s thermal output of 24.1 kW at TUV and 25 kW at UK allows for precise sizing based on the building’s heat demand. The minimum thermal output of 7.5 kW ensures efficient low-load performance. The 96.5% efficiency at 100% load reflects its high condensing performance, particularly when operating with a small temperature differential. The flow rate of 13.7 l/min at ΔT=25°C is useful for determining system circulation requirements during design and commissioning.

Installation and connection

Installation begins with selecting a secure mounting location on a non-combustible wall surface. The boiler must be suspended at a height that allows access to all service points and connections. Flue connections depend on the chimney type: 60/100 mm flue can support up to 4m, 80/125 mm up to 20m, and 80/80 mm up to 30m. Ensure that the flue path is free of sharp bends and that the terminal is positioned away from air intakes or ventilation ducts.

Gas and water connections use standard thread types. Verify that the gas supply is correctly sized and that pressure settings comply with local regulations. Water inlet and outlet ports are sized to handle the required flow rate without excessive pressure drop. A digital display and memory function are accessible after installation for monitoring and diagnostics. Check that all electrical connections are made according to the manufacturer’s instructions and that the unit is earthed correctly.

Common installation errors include incorrect flue length, poor wall mounting, and insufficient clearance around the unit. Always confirm that the chimney system is compatible with the boiler’s emissions and that any previous modifications to the system do not conflict with the new installation. A test run should be conducted to verify correct operation and to identify any leaks or misalignments.

Compatibility and accessories

The boiler is compatible with both modern and traditional flue systems, including those found in multi-unit residential buildings. It can be integrated with older turbo boilers in mixed installations where system compatibility is required. Additional components such as expansion vessels, pressure relief valves, and circulation pumps may be needed depending on the system configuration. No specific related products are listed for this model.

Technical background for designers

The BIASI RECUPERA DGT NOx 24 S operates on a condensing principle, where the heat exchanger captures latent heat from flue gases, improving overall efficiency. The atmospheric burner design ensures stable combustion under varying load conditions. The materials used in the construction are selected for their resistance to corrosion and thermal stress, which contributes to long-term reliability.

The boiler integrates into both primary and secondary circuits, and its modular range allows for proportional modulation to match the building’s heat demand. The equithermal regulation system adjusts the supply temperature based on outdoor conditions, optimising comfort and efficiency. Proper insulation of pipework and careful routing of the flue can further enhance performance and reduce heat loss.

Service and operation

Maintenance includes checking the gas pressure, inspecting the heat exchanger for blockages, and verifying the integrity of electrical connections. The boiler includes a memory function for recording error messages, which aids in troubleshooting. A reset function for maintenance intervals is available to track service requirements. Regular cleaning of the flue and burner area is recommended to maintain efficiency and prevent soot buildup.

During operation, ensure that the digital display shows no fault codes and that the boiler responds correctly to zone control signals. If unusual noise or performance issues arise, refer to the technical documentation for diagnostic procedures. The IPX4D rating ensures protection against splashing water, making it suitable for installation in areas with moderate humidity.

Frequently asked questions

Can the boiler be connected to older combined chimney systems?
Yes, the BIASI RECUPERA DGT NOx 24 S is approved for connection to traditional and combined chimney systems commonly found in apartment blocks.

What is the minimum thermal output of the boiler?
The minimum thermal output is 7.5 kW, allowing for efficient low-load operation and modulation across a 1:3 range.

Is the boiler suitable for use with two heating zones?
Yes, the boiler supports direct control of up to two heating zones, enabling independent temperature regulation for different areas of the building.

What does the IPX4D rating mean for installation?
The IPX4D rating means the boiler is protected against splashing water from any direction, making it suitable for installation in environments with moderate exposure to moisture.

Documents for download

• Installation manual (PDF)
• Technical specifications (PDF)
• Maintenance guide (PDF)
• Error code reference (PDF)
• Wiring diagram (PDF)