OSA K

Stylish, wall hung, low NOx, condensing, room sealed, gas boiler with electronic ignition and continuous modulation, with DHW production.

Output: 28 kW

• Exchanger/Condenser in Alluminium/Silicon/Magnesium
• Ignition and electronic flame control through single electrode
• Modulation ratio1:8
• Total premix burner, with constant combustion ratio, completely electronic (both, gas valve and modulating fan)
• Automatic Feed-back of the combustion through the electrode (that monitors constantly the quality of the combustion)
• Adjustment of output according to heating request
• HWS “Hot Water Speed”: commutation from heating to DHW mode without stopping the pump
• DHW heat exchanger in antiscaling stainless steel, with 12 plates (x 24 kW) and 14 plates (x 35 kW), with “thermal length” optimized for the condensation
• Management of 2 zones: high / low temperature, with differentiated priority
• Electronic antifreeze function from 5°C
• Pump over-run function
• Safety limit thermostat
• Temperature sensors in flow and return
• DHW temperature sensor
• High efficiency pump, complying with the Erp Directive 2015, modulating according to the output request, managed by the on board electronics
• Expansion vessel (10 liters)
• Automatic airvent  
• Minimum pressure switch against the lack of water
• Pressure safety valve set at 3 bar
• Disappearing U/FLY Touch panel board, with outer and room temperature sensors
• Gateway for Modem connection and remote programming through smartphone, with a dedicated App
• Connection for diagnostics and programming through computer or portable programmer.
• Inspection system of the burner and heat exchanger cleaning through quick release clampings  
• Front panel in colored polymetilmetacrylate
• Siphon drain for condensates