Thermax Brand Guidelines: From Wanson India in 1966 to a Pune Engineering Group

A small shed in Pune and a Belgian partner.

Thermax began in 1966 as Wanson India. English Wikipedia says the company was founded that year by A. S. Bhathena to make package boilers. The company’s own history places that start in Pune, in a small shed with a team of around fifty, and says the first products were small coil-type packaged boilers sold as Vaporax, made in collaboration with Wanson of Belgium.

Bhathena was not new to industry. The company says he began in 1947 with a partnership firm, National Steel, which made sterilisers, autoclaves and other hospital equipment, and that he founded Wanson India together with Rohinton Aga.

The name changed in 1980, when, the company says, Wanson India became Thermax Pvt. Ltd. after Bhathena retired. English Wikipedia dates Aga’s succession as chairman to 1981, the same year the company timeline gives for his appointment as chairman and managing director. From 1996 the company was chaired by Anu Aga, and since October 2004 it has been chaired by Meher Pudumjee, according to the company.

The early range soon spread beyond small boilers. The company says it introduced thermal oil heating to Indian industry in 1967 with Thermopac, which it describes as now a generic name for thermal oil heaters in India. Solid-fuel boilers followed in 1975 under the Multitherm name, together with a water treatment business, and an air pollution control division in 1979. In 1982 it introduced the Revotherm shell-type boiler through a technical collaboration with Ygnis of Switzerland, and in 1988 the coil-type Revomax, the company says.

Partners, a listing and a Danish boiler maker.

Thermax grew through partnerships with foreign engineering firms. The company lists a collaboration with Sanyo of Japan on vapour absorption machines from the late 1980s, which ended in 1993 when it began its own research in that field, and a first joint venture with Babcock & Wilcox in 1989 to build higher-capacity boilers.

It went public in February 1995, listing on the Bombay Stock Exchange, English Wikipedia says. Wikipedia also records a 51–49 joint venture with the American group SPX Corporation in 2009, for equipment and services for India’s power sector, and a 2010 joint venture with US-based Babcock & Wilcox to make supercritical boilers for power generation.

That second Babcock & Wilcox venture, Thermax Babcock & Wilcox Energy Solutions, did not last as a partnership. In 2018 Babcock & Wilcox’s Indian holding company left it: Thermax bought 24 per cent of the shares and the venture itself bought back the remaining 25 per cent, Legally India reported in December 2018. The company says it completed that acquisition in 2018, and that in 2019 its shareholders approved moving its own boiler and heater business into the former joint venture.

Abroad, the company says it bought M.E. Engineering, a British boiler company, in 2000, and the Danish boiler maker Danstoker in 2010. Danstoker’s own history confirms the purchase and dates it to November 2010, the year of its seventy-fifth anniversary; Danstoker was set up in Copenhagen in 1935 and moved its boiler production to a new factory at Birk, near Herning, in 1965. In 2012 Thermax added Rifox, a German steam products company, the company says.

The SPX venture ended the same way as the Babcock & Wilcox one. In 2019, the company says, it bought the remaining stake in Thermax SPX Energy Technologies from Mutares and Balcke-Dürr, making it a wholly owned subsidiary. Expansion abroad continued in the meantime: the company says it opened a manufacturing facility in Indonesia in 2017 and, through its Danish subsidiary, acquired the assets and operations of a company in Poland that year. Danstoker’s history also records a production facility in Poland from 2017. In 2021 Thermax launched EDGE Live, a digital platform for monitoring the equipment it supplies, the company says.

Design and documentation.

Industrial boiler makers sell equipment that most people never see. A steam boiler sits in a plant room behind a hospital, a brewery, a laundry or a paper mill, and the people who buy one are engineers, facility managers and contractors. So the visual language of the category is built for a technical reader: catalogues, data sheets, project case studies and trade-show stands rather than shop windows.

The most common image is the boiler itself in a clean plant room. A packaged fire-tube boiler is usually shown as a long horizontal shell, painted and insulated, with its burner on the front, a control panel at eye level and the flue rising behind it. Around it run steam headers, valves and lagged pipework, photographed under even light so that every joint reads clearly. Cutaway drawings do the explaining: a shell opened along its length to show the furnace tube and the passes of smaller tubes, or a water-tube unit drawn with its drums and banks of tubes exposed.

The second register is the factory. Makers show shells being rolled from steel plate, welders at work on tube sheets, finished units on low-loader trailers and large boilers lifted by crane on site. These pictures stress scale and fabrication skill. Many firms in the category are old, and their histories lean on heritage photographs: riveted boilers, steam-era works yards, early advertisements and the first catalogues.

The customers appear too, usually as settings rather than people: a utility’s turbine hall, a food plant with stainless pipework, a district-heating station, a hospital service yard. Colour is mostly restrained, with greys, navy, white and one strong corporate accent, and type is set in plain sans or engineering-style faces chosen to sit comfortably beside drawings and specification tables.

Boilers as one strand among several.

Today Thermax Limited is headquartered in Pune. English Wikipedia describes it as an Indian multinational engineering conglomerate working in clean air, clean energy and clean water. The company says it runs 16 manufacturing facilities, twelve in India and four abroad, one each in Denmark, Germany, Poland and Indonesia; Indian plants it names include Savli in Gujarat, opened in 2006, and Sri City in Andhra Pradesh, opened in 2019.

Boilers remain one strand among several. The company’s business list runs from process heat, steam engineering, large boilers and fired heaters to water and waste treatment, chemicals and renewable energy. In 2024, English Wikipedia says, it launched Thermax Ne0, a business for biogas purification and gas enrichment. Since 2023 the company has described itself as a “trusted partner in energy transition,” and it says it won the IMD Global Family Business Award in 2023.

One naming point is worth knowing. The Scottish boiler maker Cochran also used a Thermax name for boilers, and says its current ST range builds on it; that name has no connection with Thermax of Pune.

For a design guide, Thermax shows how a boiler maker that began under a foreign partner’s name built a name of its own and spread into water, chemicals and energy. Compare Babcock & Wilcox, its partner in two joint ventures, and Spirax Sarco, another steam-system name. For this guide we use a deep teal, ink and a copper with a sans, an unofficial interpretation; no product or logo is reproduced.

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