2 zone heating and hot water cylinder

Hi,

I have 2 heating zones in my house, 1 downstairs and 1 upstairs, these are valve controlled and currently wired into a mulyi-zone timer which also controls the hot water. Essentially 3 zones. How can I wire this into the Tado reciever as there is only 1 heating zone? Is it possible to connect the 2 heating valve zone wires into the single zone on the reciever?

Shane