Crystal Palace plumber Installation of a Worcester-Bosch boiler in Crystal Palace SE19. Removal of an old and inefficient boiler. Power flushing of the heating system was carried out. A powerflush will remove on average over 3Kg of sludge and other deposits from an old heating system. Where the system has had an incorrectly arranged cold feed and vent pipe, or where no inhibitor has ever been added, anything up to 7Kg of dirt may be removed. We installed a high quality Worces