A well heater is installed in a well by spooling electrical cable assemblies for heating and supplying power, in proper sequence, on at least one spooling means, unspooling them and attaching them to a heat- and tension-stable support means as the resulting assembly is drawn into the well by a weight...http://www.google.com/patents/US4572299?utm_source=gb-gplus-sharePatent US4572299 - Heater cable installation
