Verified Nov 2026
Thermal & Fluid Systems
·
Gallarate, Lombardia
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Since 1953
AC Boilers S.p.A., formerly Ansaldo Caldaie, is an Italian manufacturer of steam generators headquartered in Gallarate, Lombardia, Italy. Founded in 1953, the company employs an estimated 200 to 500 people and is privately held. It designs, manufactures, and erects utility and industrial boilers, heat recovery steam generators, and biomass and waste-to-energy boilers for the power generation, automotive, construction, renewable energy, and industrial equipment sectors. Its most recent reported development concerns a 2026 acquisition, with a planned relaunch of the former AC Boilers site at Gioia del Colle still under discussion with regional and national authorities.
AC Boilers S.p.A. formerly Ansaldo Caldaie at a glance
Revenue
$10-50M
Est. band
Employees
200-500
Founded
1953
Headquarters
Gallarate, Lombardia
Certifications
ISO 9001
Industries
Automotive
Electric Vehicles
Construction
Renewable Energy
Industrial Equipment
STABILITY SIGNALS
Established & active
73 years in operation (founded 1953).
Holds ISO 9001 certification(s) per public sources.
Overview
AC Boilers S.p.A., formerly Ansaldo Caldaie, is an Italian manufacturer of steam generators headquartered in Gallarate, Lombardia, Italy. Founded in 1953, the company employs an estimated 200 to 500 people and is privately held. It designs, manufactures, and erects utility and industrial boilers, heat recovery steam generators, and biomass and waste-to-energy boilers for the power generation, automotive, construction, renewable energy, and industrial equipment sectors. Its most recent reported development concerns a 2026 acquisition, with a planned relaunch of the former AC Boilers site at Gioia del Colle still under discussion with regional and national authorities.
At a glance
Attribute | Detail |
|---|---|
Founded | 1953 |
Headquarters | Gallarate, Lombardia |
Employees | 200-500 |
Revenue | $10-50M (estimated) |
Primary capability | Thermal & Fluid Systems |
Certifications | ISO 9001 |
What AC Boilers S.p.A. formerly Ansaldo Caldaie makes
The company offers coal-fired, oil- and gas-fired, biomass, and waste-to-energy boiler technologies and holds ISO 9001 certification.
Products and capabilities described on the company's own site include Assembly, Welding, Emissions (source: acboilers.com).
Certifications
AC Boilers S.p.A. formerly Ansaldo Caldaie is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:
ISO 9001 — acboilers.com
Latest developments
2026-10-31 — Intesa con banche: Ac Boilers riparte - Prealpina (prealpina.it)
2026-10-22 — Ac Boilers: Urso convoca per il 18 novembre tavolo al MIMIT su operazione rilancio e cessione sito Gioia del Colle (mimit.gov.it)
2026-10-22 — AC Boilers, Tomasicchio (Fim Cisl): acquisizione conclusa, ma il piano industriale è ancora da definire - Il Diario del Lavoro (ildiariodellavoro.it)
2026-04-17 — Ansaldo, agreement to relaunch the Gioia del Colle site. Urso: 'Rebirth opportunity' - Il Sole 24 ORE (ilsole24ore.com)
2026-04-16 — Ansaldo Energia pronta ad acquisire lo stabilimento ex AC Boilers di Gioia del Colle - PRESS REGIONE - Regione Puglia (puglia.it)
2026-02-12 — Waste-To-Energy plant at the Oristeam site - Ansaldo Boilers (acboilers.com)
Company details
The company reports operating in more than 50 countries and has been a qualified supplier to Bechtel Corporation, according to its public profile. AC Boilers S.p.A. formerly Ansaldo Caldaie was founded in 1953, has an estimated 200-500 employees, and is headquartered in Gallarate, Lombardia. On the LightSource stability read it is rated "Established & active": 73 years in operation (founded 1953). Holds ISO 9001 certification(s) per public sources.
Frequently asked questions
What does AC Boilers S.p.A. formerly Ansaldo Caldaie make?
AC Boilers S.p.A., formerly Ansaldo Caldaie, is an Italian manufacturer of steam generators headquartered in Gallarate, Lombardia, Italy. Founded in 1953, the company employs an estimated 200 to 500 people and is privately held. It designs, manufactures, and erects utility and industrial boilers, heat recovery steam generators, and biomass and waste-to-energy boilers for the power generation, automotive, construction, renewable energy, and industrial equipment sectors. Its most recent reported development concerns a 2026 acquisition, with a planned relaunch of the former AC Boilers site at Gioia del Colle still under discussion with regional and national authorities.
Where is AC Boilers S.p.A. formerly Ansaldo Caldaie headquartered?
AC Boilers S.p.A. formerly Ansaldo Caldaie is headquartered in Gallarate, Lombardia (3 Piazza Francesco Buffoni, Gallarate, Lombardia, 21013).
When was AC Boilers S.p.A. formerly Ansaldo Caldaie founded?
AC Boilers S.p.A. formerly Ansaldo Caldaie was founded in 1953.
How big is AC Boilers S.p.A. formerly Ansaldo Caldaie?
AC Boilers S.p.A. formerly Ansaldo Caldaie has an estimated 200-500 employees, with revenue in the $10-50M range (estimated).
What certifications does AC Boilers S.p.A. formerly Ansaldo Caldaie hold?
AC Boilers S.p.A. formerly Ansaldo Caldaie lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.
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Last verified Nov 2026. Is this your company? Request a correction.
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