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Yes common as the incoming water temp drops your rise won’t be as much eg in summer you will have hotter water than in winter
Discuss Am I being dumb or is this a thing? in the Central Heating Forum area at PlumbersForums.net
Think on it: you have 28kW which should be plenty for heating a medium/large house. However when heating an incoming water supply you need a lot more: assuming heating from 10C to 43C 28kW will give you about 0.2 litres/sec. A domestic bath is normally assumed to be about 0.4 l/s so no chance of getting high flows and temps unless you have a stupidly large boiler! Suggest you look at an unvented cylinder.It heats the house fine and before this spell of cold weather the hot water was fine too it seems that the system struggles to heat up very cold incoming mains pressure water and push it through at a high temperature.
Is this a common thing?
Reply to Am I being dumb or is this a thing? in the Central Heating Forum area at PlumbersForums.net
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