The smaller coil (shown centre) is the inner coil
which is wound and then encased in copper tube and
capped to form the inner heat exchanger compartment.
The tail is then wound back to form the outer heating
coil (far right and below)
Heater coils
Shown after winding and with top cap
and bottom baffle installed.
Heater coils are wound in one
continuous length with no internal joins to ensure
there are no leaks.
Baffles direct the flow over the
coils for maximum heat transfer
Copper tube is fed in from a spool and mandrel wound
into the various heater coils
Shown is a hot water unit Coil being wound, encased and wound again
