A latent-heat exchanger comprising an upper heat exchange unit in which a plurality of circulating-heating-water heat exchange units having a circulating-heating-water flow channel formed therein and a lower heat exchange unit disposed on the lower side of the upper heat exchange unit, in which a plurality of direct-water heat exchange units having a direct-water flow channel formed therein is provided.

A latent-heat exchanger comprising an upper heat exchange unit in which a plurality of circulating-heating-water heat exchange units having a circulating-heating-water flow channel formed therein and a lower heat exchange unit disposed on the lower side of the upper heat exchange unit, in which a plurality of direct-water heat exchange units having a direct-water flow channel formed therein is provided.

A portable heating apparatus to supply a predetermined amount of heat and hot water, is disclosed. The portable heating apparatus comprises a condensing boiler comprising an inlet port to receive the water from any external supply unit wherein a central heating system is configured to heat the water to a predefined temperature. A storage container is configured to receive the predetermined amount of hot water from the condensing boiler via a connecting pipe raised by a central pump, wherein the storage container is configured to constantly heat the hot water and routes the hot water to a radiator section via a distribution line for heating a surrounding space. The condensing boiler and the storage container are mounted on a frame and maneuvered on a plane surface using a handle and a wheel assembly.

A heat exchanger for boilers, in particular for condensing boilers. The heat exchanger having a set of heat exchanging plates inside which the water to be heated flows and outside which the combustion products coming from a burner pass. The heat exchanger has plates coupled to diaphragms for closing openings present on the plates; each plate having at least two levels of respective channels for the water flow to be heated. Hydraulic connections in series between the channels can be provided on the layer closest to a burner.

A heat exchanger for boilers, in particular for condensing boilers. The heat exchanger having a set of heat exchanging plates inside which the water to be heated flows and outside which the combustion products coming from a burner pass. The heat exchanger has plates coupled to diaphragms for closing openings present on the plates; each plate having at least two levels of respective channels for the water flow to be heated. Hydraulic connections in series between the channels can be provided on the layer closest to a burner.

A heater comprises an inlet for a medium to be heated, an outlet for the medium, and at least two cassettes. Each cassette comprising a first plate comprising a first main surface and a second plate comprising a second main surface. The first and second plates are attached to each other and enclose a respective flow channel for the medium. The cassettes are arranged beside each other with a space between the cassettes for an electric heating element. The electric heating element abuts the first main surface of one of the cassettes and the second main surface of the adjacent cassette. The heater comprises two distance members extending between the one cassette and the adjacent cassette. The distance members define the space.

A heater comprises an inlet for a medium to be heated, an outlet for the medium, and at least two cassettes. Each cassette comprising a first plate comprising a first main surface and a second plate comprising a second main surface. The first and second plates are attached to each other and enclose a respective flow channel for the medium. The cassettes are arranged beside each other with a space between the cassettes for an electric heating element. The electric heating element abuts the first main surface of one of the cassettes and the second main surface of the adjacent cassette. The heater comprises two distance members extending between the one cassette and the adjacent cassette. The distance members define the space.

A heat exchanger for hot water supply (21) is comprised of: a first heat exchanging unit (21) a that heats the water, which is supplied from a second communication section x.sub.1 to the hollow portions of hollow plates P.sub.1 to P.sub.5 and reaches a first communication section y, by a combustion exhaust gas that circulates through the gaps among the hollow plates P.sub.1 to P.sub.5; and a second heat exchanging unit (21b) that heats the water, which is supplied from the first communication section y to the hollow portions of the hollow plates P.sub.6 to P.sub.8 below the hollow plates P.sub.1 to P.sub.5 and reaches a third communication section x.sub.2, by a heat medium that circulates through the gaps among the hollow plates P.sub.6 to P.sub.8.

A heat exchanger for hot water supply (21) is comprised of: a first heat exchanging unit (21) a that heats the water, which is supplied from a second communication section x.sub.1 to the hollow portions of hollow plates P.sub.1 to P.sub.5 and reaches a first communication section y, by a combustion exhaust gas that circulates through the gaps among the hollow plates P.sub.1 to P.sub.5; and a second heat exchanging unit (21b) that heats the water, which is supplied from the first communication section y to the hollow portions of the hollow plates P.sub.6 to P.sub.8 below the hollow plates P.sub.1 to P.sub.5 and reaches a third communication section x.sub.2, by a heat medium that circulates through the gaps among the hollow plates P.sub.6 to P.sub.8.

A heat exchanger plate for a plate heat exchanger (12) includes a first side, a second side and a center point (P) through which an imaginary center axis (A) extends in a direction perpendicular to a plane of the plate. The plate comprises a first port for a first medium, and at least a second port and a third port for a second medium. The plate further comprises a first sealing arranged on the second side around the first port, a second sealing arranged on the second side at a circumference of the plate, and a closed third sealing arranged between the first and second sealings to form a first heat transfer area and a second heat transfer area separated from the first heat transfer area. The second port is arranged in the first heat transfer area and the third port is arranged in the second heat transfer area.