Single and twin head high-efficiency in-line circulator pumps that confirm to the latest energy efficiency standards. These pumps feature solid cast iron construction and are also available with a modular variable speed drive for increased energy efficiency. The e-LN range, include the LNE (single head) and LNT (twin head) models are the commercial and industrial cast iron Lowara pumps. These are also available with an integrated eSM (LNEEE) or Hydrovar (LNEEH) variable speed drive.