Returns of faulty items are free of charge, no fault returns may be subject to a handling charge please see the. What you pay for installation will depend on precisely what needs to be done, and which boiler you are changing from and to for instance. How to stop a leaking radiator? there’s nothing worse than having a leaky radiator and not knowing what to do that’ll all about to change as we go. At drainline southern we can deal with large pipework.