Glow-worm space saver boiler causes interferance on both digital and terrestrial tv / radio. After period of heating ,when the boiler comes to shut down (every ten miutes or so) there is a crackling noise from the boiler coinciding with loss of picture and sound from tv / radio until crackling has ended.
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michael bell, March 2008

thermostat. they have suppression components which deminish through time. generally the disturbance will be as the boiler is reaching temp then should end when the vlave shuts off.

iain, March 2008