From market-leading bathroom manufacturers, Vitra is a concealed cistern for back-to-wall WC's. Available with either a standard or economic cistern.
The standard has a volume of 3/6L, the eco option uses less water and has a volume of 2.5/4L this helps you save money by using less water, which also benefits the environment. If you do choose to go for the 3/6 litre flush plate there is an option to have a reduced height. This would be ideal for a bathroom with a window above restricting the space you have available.
There is a wide selection of flush plates available from Vitra that would compliment this cistern perfectly. Keeping the clean modern look by concealing the cistern behind the wall and activating the flush with a Vitra flush plate.