I would double check with the installer on what they are doing and what they are supplying. The reason I say that is £2300 for a platinum and moving it and sorting out a 1 pipe system upstairs is really cheap. I would be looking for around that just to move it with a filter and clock etc.
Also why are you moving the boiler? How much longer is this going to make your hot water run? If you have to extend your pipe 5 meters that would be an extra 3/4 of a litre of water every time you want hot water.
I'm a big fan of baxi myself and you can't go wrong with the platinum but as Chris said there is also the 600 which seems a good boiler I've fitted a few and all good so far. I'm not a big fan of vaillant I think they used to be great but I think them like Worcester are living off old reputation. Ideal I wouldn't touch at all, shocking customer service (round me at least) and sometimes trying to get hold of parts has been a pain. But if you ask several installers you will get all sorts of answers.
Also why are you moving the boiler? How much longer is this going to make your hot water run? If you have to extend your pipe 5 meters that would be an extra 3/4 of a litre of water every time you want hot water.
I'm a big fan of baxi myself and you can't go wrong with the platinum but as Chris said there is also the 600 which seems a good boiler I've fitted a few and all good so far. I'm not a big fan of vaillant I think they used to be great but I think them like Worcester are living off old reputation. Ideal I wouldn't touch at all, shocking customer service (round me at least) and sometimes trying to get hold of parts has been a pain. But if you ask several installers you will get all sorts of answers.