For heating surface equipment of water-injection well it is suggested to use soil heat from 3 m depth. For this purpose convection heat exchangers KT-<(III)under bar>-114 and KT-C-48 have been developed, Installation of heal exchangers prevents freezing of injection wellhead in emergerncy stoppage of injection during 5 days. Success of the suggested technology makes up 100%. Service life of the equipment is 7 years. Designs of the heat exchangers are compatible with conventional wellhead equipment of injection wells and they are self-contained systems, which do not require permanent servicing and external power sources for heating.