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The paper includes description of an experiment where the insulation of 532 m long 1200 mm pipe section was replaced with prefabricated polyurethane (PUR) foam shells. As a result reduction of heat losses in comparison with old insulation by 3.35 times was calculated. After successful experiment full renovation of DH main pipe (total pipe length is 10730 m) insulation was performed. Renovation of main pipeline was finished in summer 2015. The first results show that relative heat losses in Eastern part of Tallinn supplied by renovated DH main pipe were decreased from 20.2% to 16.0%. [ABSTRACT FROM AUTHOR]