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Defra guidance states that hot water should be stored at a temperature of not less than 60ºC and distributed at a temperature of not less than 55ºC. This water distribution temperature may not be achievable where hot water is provided by instantaneous or combination boilers.
Where practicable it should also reach your tap and be at least 50ºC within 30 seconds after fully opening the tap. This criteria may not be achievable where hot water is provided by instantaneous or combination boilers.
WaterSafe Approved Contractors' Scheme Operators
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