You say that the heating is working OK and hint that you have no hot water.
If the heating is working OK then the boiler's flame is fine and needs no adjustment - it's not something that an untrained person should do - adjust the gas flow.
You have a Hot water Problem and may do best by calling out a specialist Heating Engineer from yellow pages.
Good luck...
Peccavi
February 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.