The Perge Optitherm oil boilers to be outfitted operate without any low limitation of the inlet temperature, without any mixing valve feed one accelerated heating circuit (i.e, heating floor and radiators), without any mixing valve and one thermosiphon heating circuit (i.e : 1 towels drier in the bathroom and a radiator in the living-room) ensure the accumulated domestic hot water production (100 liter or 150 liter enameled tank) with natural circulation