Calpak was founded in 1976 as a subsidiary company of BP (British Petroleum) and soon became the first company in Europe to make the use of solar energy for domestic hot water familiar to the consumers. Since 1990, it continues its successful course as a purely Greek company. Up to date, more than 300,000 Calpak solar systems have been installed in European householders whilst Calpak remains a pioneer in the field of research, development and production of quality solar thermal collectors and hot water tanks.