Aha! Don't I feel the fool. Have to say the operating instructions provided are rubbish with no suggested figures for anything. Ones on-line slightly better but certainly don't provide this basic info.
Many thanks.
Peter
Help please! 6 month old boiler has been excellent then cut out overnight due to loss of water pressure. Put in water and it started up with relevant fault sign removed on loading. However, hot water (tap) sign has gone missing and it will not show me anything to do with it including comfort...