Discover our range of District Heating Substations

About Us

STEA S.r.l. operates in the field of integrated technological services aimed at saving energy.
Designs, manufactures and installs space heating and district cooling substations, offering contracts for energy services with special attention to the rational use of energy and saving solutions and energy efficiency (thermal and electric). Stea is certified UNI-EN-ISO 9001, UNI CEI 11352,  ISO 14001 , OHSAS 18001 and SOA for the main categories in public procurement.


Stea Efficienza energetica

Energy Efficiency

Certified application of new technologies and modern equipment for reduction of energy consumption and savings directly to the customer.

Stea Prodotti Servizio Energia

Energy Service

The Energy Service Contract promotes energy saving through reduction of consumption needed to maintain comfort.

Stea Sottostazioni per teleriscaldamento

District Heating Substations

District Heating Substations for processing fluid from district heating plant into space heating and domestic hot water.



Logo Fenenergia
Logo evolve
Logo Iem

CO.S.FEN group the follwing companies Fen Energia S.p.A. – STEA S.r.l. – Evolve S.r.l. – Mieci S.p.A., forming a consolidated economic operator in the Energy Services market with aggregate turnover of over 140 million euro and over 90 direct employees.


Companies have the following business certifications:

  • UNI EN ISO 9001 Quality Management System certification
  • UNI EN ISO 14001 Environmental Management System certification
  • ISO 45001 Health and Safety Management System certification
  • Energy Services (ESCo) UNI CEI 11352 certification


CO.S.FEN owns the SOA Attestation in following categories and rankings: OG 1 cl. IV, OG 9 cl. IV, OG 10 cl. IV, OG 11 cl. VI, OS 3 cl. III-Bis and OS 28 cl. V.


SOA attestation for OG1, OG9, OG10, OG11, OS3 and OS28 categories