Ariston Thermo is an Italian corporation that produces heating systems and related products, marketed mainly under the Ariston, Chaffoteaux, Elco, Racold, Atag, NTI, Cuenod, Ecoflam and Thermowatt brands. 
In 1930, Aristide Merloni founded Merloni Industry in the Marches and began producing scales. The production of electric water heaters dates back to 1960, with the appearance of the Ariston brand, which would propel the Group to lead the way in the 1970s. 
Following the success of Ariston heaters , in the 1980s the company decided to enter the space heating industry and started manufacturing boilers.
During the 1990s the company opened its first branches in Eastern Europe and Asia. In the same years Ariston Thermo Acquired Racold  – India’s largest water heaters’ manufacturer – and opened its first wholly owned plant in China.
Chaffoteaux, Elco, Cuenod and Rendamax. Chaffoteaux, Elco, Cuenod and Rendamax.
Over the two-year period 2004-2005, new plants were inaugurated in Hanoi and St Petersburg , while the acquisition of Ecoflam was completed among the leading companies for heating systems; in 2008, after the acquisition of Termogamma SA,  specializing in the production of heat pumps, the company opened its European center of excellence for solar heating systems in Italy, in Serra de ‘Conti . In 2009, the company – until then part of MTS Group – changed its name to Ariston Thermo.  Ariston Thermo acquired in 2011 Cipag SA and Domotec AG, leaders in Switzerland for the production, distribution and maintenance of water heating systems. 
DhE – an Italian company specializing in heating elements for commercial and industrial applications – and the set up of a joint venture for the production and marketing in Uzbekistan of domestic heating systems.
In 2014, the company entered the South African market directly through the acquisition of Heat Tech Geysers – the country’s second player for water heaters – and inaugurated an electric water heater factory in Vietnam.   In the same year it also strengthened its presence in mature markets with the acquisition of ATAG Heating, a Dutch high-end brand in the heating industry.  
In April 2015, signed the acquisition of Gastech – Energi A / S, a leading company in the field of domestic and industrial heating in Denmark , announced during the inauguration in Russia of a new logistics center of approximately 10,000 m² in the production site of Vsevolozhsk , near St. Petersburg. 
In September 2016, Ariston Thermo announced the acquisition of the majority stake in NY Thermal Inc., a company based in Saint John, Canada, operating in the domestic and commercial NTI branded condensing boilers in Canada and the United States US.   
In 2016, Ariston Thermo sold 7 million products in over 150 countries worldwide, amounting to a turnover of 1.43 billion Euro. It employs 6,900 people working in 59 companies, with 8 representative offices in 36 countries. 
- Elco Heating Solutions (founded as Emile Looser Company)
- ATAG (ATAG Heting Group founded by Antoon Tijdink and Antoon van Goor)
- Francesco Merloni
- Indesit Company
- Solar thermal energy
- Jump up^ “Our brands” . Ariston.
- Jump up^ “Ariston” . Museo del marchio italiano. Archived from the original on 3 November 2014.
- Jump up^ “MTS group to invest Rs 30 cr in Chakan plant” . Archived from the original on 23 October 2014.
- Jump up^ “MTS Group acquires the Termogamma SA” (in Italian). Soldionline.
- Jump up^ “Mts Group: cambia nome in Ariston Thermo Group” (in Italian). Milano Finanza.
- Jump up^http://www.ansa.it/web/notizie/regioni/marche/2011/07/11/visualizza_new.html_787057524.htmlAnsa – Ariston Thermo Group Acquires Cipag and Domotec
- Jump up^ “Company Overview of Tech Tech Geysers (Pty) Ltd” . Bloomberg Businessweek .
- Jump up^ “Italian water heating firm opens $ 18mn plant in Vietnam” . Vietnam Breaking News.
- Jump up^http://www.buildersmerchantsnews.co.uk/news/fullstory.php/aid/9895/Ariston_Thermo_acquires_ATAG_Heating.htmlAriston Thermo Group Acquires ATAG Heating
- Jump up^http://www.verwarming.nl/nieuws/ATAG+Heating+wordt+onderdeel+van+Ariston+Thermo.html?contentID=6130ATAG Heating, speler op een belangrijke Benelux verwarmingsmarkt, wordt van onderdeel Ariston Thermo Group , een wereldspeler op het gebied van verwarming en warmwaterbereiding
- Jump up^ http://www.anecta.se/Ariston-Thermo-f%C3%B6rv%C3%A4rvar-marknadsledande-v%C3%A4rmeinstallat%C3%B6r.aspxTramslink Ariston Thermo Group Advises in Acquisition in Denmark
- Jump up^ http://www.ilgiornaledeltermoidraulico.it/ariston-thermo-entra-nel-mercato-nord-americano-con-lacquisizione-di-nti/
- Jump up^ http://www.rcinews.it/2016/09/26/ariston-thermo-entra-nel-mercato-nord-americano-con-lacquisizione-di-nti-leader-nel-riscaldamento-idronico-a -condensazione /
- Jump up^ http://www.commercioidrotermosanitario.it/ariston-thermo-entra-nel-mercato-nord-americano-lacquisizione-nti/
- Jump up^ “The Group in figures” . Ariston.