A powerful solution to clogged drains! double trouble for the blocked drains! State of illinois licensed plumbers. System boilers - also known as sealed system - come with a water cylinder (which usually sits in an airing cupboard) and no water tank. Contact d j murray plumbing and sewer service today if you are experiencing any residential or commercial plumbing issues including sewer back up, clogged drain, tree roots in sewer line, frozen pipes, backflow prevention.