Bosch WTE84106gb/48 condensate drain pipe

The official kit to do an extension for the drain water is to use Bosch part 12013826. This hose is only 2 mtrs long. price from Bosch is £6.15 plus p.p, price from Ransom Spares £10.45, Price from FixPart at a typical robbery price of £17.22. Price from Amazon about a £13 fleecing. So that is going to be too short from what U say.
The other ways to do this is to use your existing dryer`s drainage hose and use a joiner to another extension pipe. The joiner you`ll probably get from an Aquatic Center and the pipe of the right diameter from there too or use the 12013826 to extend or of course preferably a complete 2.5meter hose of the right nozzle diameter without any joins at all.So long as nothing kinks whether rubber or transparant plastic does not matter
What you do not want to do is end up with something far too long that will coil and so get air breaks – the pump is fairly guttless – so bear that point in mind. Try to avoid having a washing machine and the dryers pipe into the same standard diameter single stand pipe as the dryer one will get squashed / kinked – usually what happens!.