Removable Type Porcelain Bobbin Heaters offers a large heated area to the gases, liquids or semi-solids to be heated when inserted into a thermo well. These Bobbin Heaters may be removed for repair or replacement without draining the contents of the vessel. These Bobbin Heaters come with open helical coils of high resistance wire which is evenly stretched and laid through fluted refractory bobbins. These Removable Type Porcelain Bobbin Heaters are also welded to screw plugs of 1 2or 2 BSPT.