OSA

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