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24, 30 & 35 15.2 Setting the Maximum Central Heating Flow Temperature: The boiler is dispatched with the CH flow temperature set at 85°C. When a lower maximum temperature is required, such as in the case of under-floor heating, the factory setting can be adjusted to a maximum of 50°C giving a return temperature of 30ºC, by setting dip switch 'S6' into ON position.