Many ranges of ASCO valve can cope with hot water duty, but depending on how hot the maximum temperature gets, the specific valve model to be chosen varies. Standard NBR seals can cope with water temps up to +85°C. EPDM increases the maximum temperature capability up to 150°C (3/8" to 3/4") & 130°C (1" to 1½"). Anything hotter and the Steam valve ranges should be used instead. Hot Water Valves include 238, 222, 210 & 220 Series.