Plungers with a flat cup are best suited for sinks those with a funnel or cone extending from bottom of the cup are more effective on toilets. Worcester-bosch, baxi, vaillant, ferroli, glowworm, ideal, potterton, ravenheat and vokera we offer a / callout for boiler repair in york! But he is disgusted by much of the debate in america. Have you had any of the following problems with your boiler? Cctv drain survey - get.