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How can I fix my Vaillant Turbomax Combination Boiler?

My Vaillant Turbomax Combination Boiler provides a good hot water supply to the radiators but the tap water is only tepid - how can this be fixed?
B.P. O'hara, February 2012
Clean hot water heat exchanger ,with sprit of salt acid ,not DiY job

ltd, February 2012
link Click here to see other fixes for Vaillant.