1. Adoption of the Paris agreement;United Nations Framework Convention on Climate Change,2015
2. Renewable heat policies - delivering clean heat solutions for the energy transition;Collier,2018
3. Renewable Energy Directive. Directive (EU) 2018/2001 of the European parliament and of the council of 11 december 2018 on the promotion of the use of energy from renewable sources. OJ L328/82, 2018, URL.
4. A review of solar collectors and thermal energy storage in solar thermal applications;Tian;Appl Energy,2013
5. Requirements & guidelines for collector loop installation;International Energy Agency,2014