ProBoil hot water tap boiler leaking

[peedy17]

I have a proboil 2x boiler for my instant hot water tap.
It has developed a leak from inside the casing. This is the 3rd boiler i have had now as replacements and all developing the same leak.
I live in a soft water area, any ideas what could be causing this or is this a known fault?

 

[N Nicho]

I have just had the same issue with the unit being replaced under warranty!
I dismantled the unit and discovered a plastic spigot on the Venturi unit had cracked.

This was the response from Abode:

From the images sent over it does look like the venturi has snapped which can happen due to a build up of pressure internal to the tank—this can be caused by a lack of maintenance, poor installation, or transit damage. As we checked over your install, we can rule this cause out.