The pipe where the hot water pex connects to the valve on the Alde appears to be simply loose. The fitting where the pex connects is a "John Guest" fitting. I would drain the Alde hot water tank with the Yellow Valve, and with the Alde cooled off, see if you can "reseat" that connection. Push the pex into the valve, and it will release. Push the pex back in, and it may reseat itself. If it is the pipe that is cracked or leaking outside of the valve, you will have to get very specific with buying the pex in the correct size. This is the valve, if it has failed.
Note that is the "European" web page in the link. The US Truma web page was "redesigned" recently and has become relatively worthless. If you need that valve part, when you order from a dealer, that photo should get you the proper part (they probably are no different for the US or UK versions).
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