Heat exchange apparatus

A heat exchange unit for use in a central heating system, which heat exchange unit comprises in combination:

• 1. a housing;
• 2. a liquid conducting array of parallel pipes so arranged as to enclose an area, said pipes being spaced inwardly of said housing to define a gas chamber between said pipes and said housing;
• 3. a gas outlet in said gas chamber;
• 4. upper and lower liquid chambers communicating with said pipes whereby liquid can be passed through said pipes;
• 5. heat conducting material woven around said pipes with said heat conducting material extending substantially transverse to said pipes and being in contact with said pipes and with itself;
• 6. a metallic coating on said heat conducting material and said pipes adhering said heat conducting material to said pipes and to itself to form said heating conducting material and said pipes into a solid body having spaces between said heat conducting material and said pipes through which hot gas can pass, whereby in use of said heat exchange unit said hot gas can pass from the center of said liquid conducting array through said spaces and into said gas chamber and out through said gas outlet and heat conducting material passing around said pipes to cross over itself between said pipes, and wherein more heat conducting material is wound around the outside of said pipes, and metal rods are positioned in gaps formed between said pipes and said crossover points, said rods being adhered to said pipes and to said conducting material by said metallic coating.