Combi Boiler - Initally very hot water before settling
Wonder if anyone would be able to help. I have a Bosch Greenstar Boiler (GR8700iW 30C) and have noticed something and want to know if it's normal or if there's a way to fix it. When using hot water from a completely cold system, the hot water (on the display) goes to about 70-75 degrees (sometimes close to 80) and a slug of hot water comes up from the tap. The flame then turns off and output settles and stays at the set 50 degrees without any issues.
Is this normal for a combi boiler? For context it's almost 4 years old and I think our building has relatively low mains pressure. Appreciate if someone with more knowledge than I could help :-).