The ideal temperature for a boiler to be set at for hot water in the UK depends on several factors, including personal preference, weather, and health and safety. Here are some recommended temperature settings from the search results:
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Heating water: For a modern combi boiler, the radiator heating temperature should be set for a flow temperature of between 60 and 70°C. Any higher than this and the boiler won’t enter condensing mode and be at its optimum efficiency and performance. In spring and autumn months, consider reducing the boiler’s radiator temperature further - to around 50 or 55°C, as this will provide additional efficiency at the cost of heating performance. Typical low-temperature settings should be within the range of 120-160 degrees Fahrenheit and high-temperature settings should be within the 180-200 degree Fahrenheit range.
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Hot water: The best temperature for your hot water cylinder is between 140-150 degrees Fahrenheit. For health and safety reasons, try to keep your boiler temperature no higher than 50°C. Anything over 45°C at the point of use (tap or shower) can cause scalding so would need to be mixed down with the cold water.
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Boiler: Setting your boiler’s temperature higher will give you hot radiators, but it could decrease its efficiency. Ramping up the temp to max could decrease it by up to 20%, and send your heating bills skyrocketing. If you’re looking for a good balance of warmth and efficiency, you want to set your boiler to at least 65°C. Setting it a few degrees higher won’t hurt. But it’s important not to set it any lower than that. This is so bacteria in the water doesn’t grow, and cause nasty ... .
Its important to note that the temperature settings may vary depending on the type of boiler and personal preference. Its recommended to consult the manufacturers instructions or a qualified heating engineer for specific advice on your boiler.
