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YYL(YYW)organic heat-medium boiler is snap-type forced circulation oil gas-fired boiler.The compact heating area comprises of inner,Website:http://www.xnboiler.com,minddle and outer or inner and outer closely-aligned round coils.Inner coils are the radiation heating area and middle and outer coils serve the convection heating area with external surface of inner coil.Fuel fires and generates the heat in the conbection chamber of inner coils.Most heat is absorbed by the radiation heating area and residue hot fume flows in the convection heating area for heat exchange.Finally low-temperature fume