STELT condensing boiler, made from AISI 316 Ti stainless steel with revers flame combustion chamber able to produce hot water at a maximum temperature of 100 °C. Connectible to air injected burners operating on gaseous fuels. According to 90/36/CEE (gas) directive, CE 311/06 (efficiency) label, 89 /366/CEE (electromagnetic compatibility), 72/23/CEE (low voltage).  

• Inclined boiler body for condensate drainage support
• Large cylindrical combustion chamber with reversed flame composed out of AISI
• 316 Ti stainless steel, TIG pulse welded, able to withstand acid condensate attack.
• Stainless steel fuel passage with special profiles, placed inside the combustion chamber in order to extend fume development and consequently increase heat exchange, or increase boiler efficiency (and obtain low NOx emissions in conjunction with Low NOx burners)
• Heat exchange surfaces made from AISI 316 Ti stainless steel, welded with TIG method, consisting of stainless plates characterized by a particular corrugated shape being able to increase heat exchange surface, and facilitate droplet condensate formation allowing adequate drainage.
• Welded using TIG, MIG and plasma procedures, methods that guarantee stainless steel main mechanical characteristics, without sacrificing corrosion resistance to acid condensation.
• Flanged delivery connection and two systems return connections for boiler differential input and ensure minimum possible temperature and take advantage of condensation benefits even in case of medium-high temperature returns.
• Flue gas chamber able to collect resulted condensate and discharge it through a water trap connected to a neutralizer (where provided) to the domestic water drainage system.
• Burner mounting plate, for attaching pressure jet burners for gaseous fuels use.
• Heat dispersion surface insulation with thick glass wool mattress, protected with steel varnished panels that can be easily removed front door with reversible steel sheet opening thermally insulated with ceramic fibre.