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NL8301329A
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Heat exchanger and central heating boiler with such a heat exchanger.
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NL8301019A
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Partition between media in heat exchanger - consists of two coaxial tubes laterally compressed leaving leak detection passage between them
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EP0048517A1
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A district or block heating system
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EP0048518A1
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A district or block heating system
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NL8004613A
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Standing central heating boiler.
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NL8004437A
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Vertical central heating boiler - has end wall of liq. jacket wider than spacing between outer wall and inner wall jacket staves
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DE2313492A1
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BOILER FOR CENTRAL HEATING
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