Unblocked the bathroom sink instantly sounded like it was going to explode so knew it was doing it's job! If one wants to know the price and the combi boiler installation cost; one can choose an all inclusive offer, ranging from around. See our great oil and gas offers over the cold season - they'll be sure to keep you warm! Experts in drain repairs, fast call outs. With state-of-the-art technology, to find cracked.