Heat exchanger for a boiler

A heat exchanger for a gas-fired condensing boiler, comprising, within a monolithic structure, a plurality of pairs of mutually opposite manifolds each connected respectively by a plurality of perforated pins inserted within a portion of space which is delimited by said structure and is designed to convey the products of combustion, said manifolds being adapted to provide the circulation of the fluid to be heated between an inlet connector and an outlet connector, said products of combustion being conveyed within said portion of space between a head of the heat exchanger, for location of a burner, and an evacuation duct located proximate to a bottom of the heat exchanger;

• said plurality of pairs of straight manifolds being arranged so as to be adjacent at two mutually opposite faces of the monolithic structure, one of the manifolds of the pairs provided proximate to a head and proximate to a bottom of the exchanger being provided with a connector respectively for the outflow and inflow of the fluid to be heated, each of the remaining manifolds being provided with ports for connection to the adjacent manifold.