%0 Journal Article %T Water heater employing granular coal photothermal absorber and solar thermal collector combination %A SARIFUDIN, A. %A YANINGSIH, I. %A KRISTIAWAN, B. %A WIBAWA, A. %A FUDHOLI, A. %A AZIZ, M. %J Journal of Thermal Engineering %D 2026 %V 12 %P 610-634 %R 10.14744/thermal.0001104