interesting how their own reps don't even know this and feel that the syphonic trap will struggle to keep the boiler clear of water! (straight from the local guy tonight)
Bear in mind the outlet is tiny and therefore the amount of rainwater that could enter over a time period is negligible.
In the document they have been good enough to draw a vertical VTK and tell you to relocate the wire guard into the vertical end section. This should be enough
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