(57) A heat exchange apparatus for removing residual heat from a domestic or small commercial
boiler has three heat exchange vessels 12,14,16 which contain water to be heated bythetheflue
gas. Provision is madefordraining out condensation which may form in the apparatus:
condensation forming on these cooled vessels 12,14,16 falls or is guided onto a base
80 shaped so that condensate drains out through an outlet 84 provided. A reversal
90 in the direction of flue gas proximate the base of vessels 14 and 16 promotes deposition
of fly ash. Deposited fly ash can be removed through a door 92. The apparatus is made
from steel plate. To protect it against corrosion caused by sulphur acids contained
in the flue gas, and which dissolve in the condensation, its inner casing is dip-coated
with a thermosetting synthetic resin paint curable by stoving.
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