Asap installed a new water heater very neat and professional job the technicians had a very pleasant demeanor and were easy to deal with great job asap! If that doesn’t do the trick, try option two…. Tried any of the above methods yet? the great thing about each of them is they require very little in the way of tools or money so you can give them a go as soon as possible and rest assured that your drain might soon be unblocked. Electric boilers are efficient.