Is a combi boiler right for you? Please contact for more information on: . Our licensed plumbers have hour availability and are ready to help when you need them most! We always provide our customers with a detailed specification together with a fixed price. See our new commercial plumbing page under the services tab! Complete the clearance by directing a strong jet of water down the drain from a hosepipe, or by filling the bath and sink and releasing the water in one gush. Significant.