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Photo credits

Some photos on this site are shared by their authors under Creative Commons licences. Thank you to:

• A domestic gas boiler with its casing off, Southampton: Kian Ansari, CC BY-SA 3.0
• An older Renova Bulex gas boiler: Nolf, Public domain
• The controls of a Vaillant boiler, with its display and pressure gauge: Andy Butkaj, CC BY 2.0
• A radiator with a thermostatic valve: Tiia Monto, CC BY-SA 3.0