SPIRIT will demonstrate three full-scale (> 700 kWth) industrial heat pump systems that upgrade industrial waste heat to valuable temperatures (135-160°C). The demonstration covers sites in the paper & pulp and food & beverage industry, covering 63% of the potential high-temperature heat upgrade market. SPIRIT achieves technology scaling by designing modular heat pumps with standard components covering a large portion of the industrial heat upgrade market. New business models and contractual agreements for upgrading heat technology are developed considering single and multistakeholder environments, mainly through considering heat as a service.