Biasi Rinnova Tec 35 S Suspended Gas Condensing Boiler

Product detailed description

This condensing boiler is suitable for single- and multi-family dwellings, small offices and similar applications where compact size and high efficiency are required. Installers typically integrate it into low-pressure hydronic systems with standard pipe layouts. The modulating burner and adaptive valve allow flexible adaptation to variable load conditions and fuel compositions. The unit requires standard wall mounting and access for servicing components such as the heat exchanger and control panel.

Technical parameters

Domestic hot water thermal output (80/60°C)	34.1 kW
Central heating thermal output (80/60°C)	30.6 kW
Minimum central heating thermal output	3.0 kW
Efficiency at 100% load (30/50°C)	108.5 %
Domestic hot water flow rate ΔT=25°C	20.5 l/min
Height	700 mm
Width	400 mm
Depth	300 mm
Packaging height	790 mm
Packaging width	480 mm
Packaging depth	375 mm
Gross weight	32.5 kg
Code	10314.2076.0
Brand	Biasi

These parameters define the boiler’s performance envelope. The 34.1 kW rating at 80/60°C indicates maximum heating capacity under conventional temperature gradients. The 30.6 kW DHW output reflects reduced capacity due to higher return temperatures. The 108.5% efficiency at 100% load confirms condensing operation through flue gas recovery. The 3.0 kW minimum ensures stable operation at low loads, which is important for maintaining indoor comfort during mild weather.

Installation and connection

Mounting requires securing the unit to a solid wall using provided brackets. Primary connections include 3/4 inch threaded gas inlet, 1/2 inch threaded water inlets and outlets. Flue termination should follow local regulations for condensing appliances. Installers must verify correct alignment of the primary heat exchanger and ensure unrestricted airflow around the enclosure. Common errors include incorrect flue sizing, improper venting and neglecting to set the gas valve calibration for local fuel composition.

Compatibility and accessories

This model integrates with standard thermostats and room sensors, including the optional iControl system. The adaptive gas valve eliminates the need for separate gas pressure regulators. An external temperature sensor enables weather-compensated modulation. Additional components include a 7-litre expansion vessel and a non-return valve for domestic hot water circuits. No specific alternatives are recommended for this model.

Technical background for designers

The boiler operates via premixed combustion in a stainless steel burner assembly. The primary heat exchanger consists of a stainless steel spiral enclosed in an aluminium housing, providing resistance to acidic condensate. The modulating pump adjusts flow rate according to load demand, while the adaptive gas valve compensates for variations in fuel calorific value. System efficiency depends on maintaining low return temperatures (ideally below 50°C) to sustain condensation in the flue gases.

Service and operation

Routine maintenance includes cleaning the heat exchanger and checking the burner flame pattern. The maintenance reset function allows tracking of service intervals. Installers should inspect the gas valve annually and verify the operation of the NOx 6-rated burner. The IPX5D rating protects against dust and water jets, ensuring reliable operation in typical indoor environments. Diagnostic codes are stored in memory for troubleshooting.

Frequently asked questions

Can the boiler adjust to different gas qualities?
Yes, the adaptive gas valve compensates for variations in fuel calorific content without manual adjustments. Is the heat exchanger removable for cleaning?
The stainless steel heat exchanger is designed for easy removal and cleaning to maintain long-term efficiency. What is the minimum operational load?
The boiler can operate down to 3.0 kW, allowing stable modulation even at low heating demands. How does the iControl system work?
The iControl system uses an external temperature sensor and room thermostat to regulate boiler output based on ambient and outdoor conditions.

Documents for download

• Technical specification sheet (PDF)
• Installation instructions (PDF)
• Maintenance guidelines (PDF)
• Safety and compliance data (PDF)
• User manual (PDF)