MK-2 without forced draught oil burner (320-1017 kW) High normative efficiency: up to 94% Stainless steel turbulators integrated in flue-gas passes Boiler elements made of durable, corrosion-resistant cast-iron Ideally proportioned combustion chamber Cast-iron boiler door opens left/right accross entire front, easy cleaning Amply dimensioned thermal insulation Powder-painted casing with supreme finish, easy to assemble Pre-wired control system, plug-in system for easy installation Six-year guarantee on boilers, two-year guarantee on electrical parts