Advantages:

• Modern and elegant design throughout the range
• Wide 1:7 modulation range greater efficiency and quiet operation
• Digital control panel with large backlit LCD display
• Electric three-way diverter valve
• Stainless steel premix burner
• Stainless steel water/fumes exchanger
• Increased stainless steel sanitary heat exchanger that allows the boiler to condense even in sanitary operation
• Modulating fan with electronic speed variation
• Automatic by-pass
• High-efficiency circulation pump with total modulation
• Pump antilock system and three-way valve that trips every 24 hours
• 3-bar heating circuit safety valve
• Safety thermostat against overheating of the water/flue exchanger
• Hydraulic pressure switch that blocks gas in case of water shortage
• Safety NTC probe against flue gas overtemperatures
• Temperature control by NTC probes
• Total antifreeze device
• Electronic thermometer
• Heating circuit pressure gauge
  
  
   

Features:

• Reduced heating capacity 3.9kW
• Rated domestic heating capacity 28 kW
• Rated rated heat output 24 kW
• Useful heat output at nom. heat output and high temp. regime 24 kW
• Useful heat output at 30% nom. heat output and low temp regime 8 kW
• Seasonal energy efficiency of space heating ?s 93%.
• Energy efficiency of water heating 86%
• Useful efficiency at rated thermal power and high temp regime 87.9%
• Useful efficiency at 30% rated thermal power and low temperature regime 98%
• Useful efficiency (pci) Pn - average temperature 70°C 97.6%
• Useful efficiency (pci) at 30%-return temperature 30°C 108.8%
• Useful efficiency (pci) intermediate- average temperature 70°C 98.0%
• Emissions of nitrogen oxides NOx 17 mg/kWh
• Minimum operating temperature -5 C
• Expansion tank capacity 7 liters
• Heating circuit water temperature regulation 25-80 C
• Domestic water temperature regulation 35-60 C
• Specific flow rate according to EN 13203-1 13.4 l/min
• Domestic water production ?T 25°C 16.1 l/min
  
   

Sanitary:

• Minimum domestic circuit water flow rate 2 l/min
• Minimum heating circuit water pressure 0.5 bar
• Minimum dynamic sanitary circuit pressure 0.15 bar
• Maximum heating circuit water pressure 3 bar
• Maximum sanitary circuit water pressure 8 bar
• Maximum length of concentric exhaust-suction pipe Ø 60/100 10 meters
• Maximum length of split exhaust-suction pipe Ø 80 80 meters
• Flue gas mass flow rate max 0.012 kg/s
• Flue gas mass flow rate min 0.002 kg/s
• Flue gas temperature max 80 C
  
   

Technical data:

• Dimensions (hxlxp) 700x400x299 mm
• Net weight 34 kg
• Rated electrical power 99W
• Auxiliary electricity consumption at full load elmax 0.042 kW
• Auxiliary electricity consumption at partial load elmin 0.013 kW
• Auxiliary electricity consumption stand-by mode 0.003 kW
• Sound power level, indoor 48 dB
• Degree of protection IPX5D
  
   

Connections:

• Radiator supply G 3/4
• Sanitary outlet G 1/2
• GAS Gas inlet G 3/4
• Sanitary inlet G 1/2
• Radiator return G 3/4
• Condensate drain pluggable on Ø 22 pipe