My nefa valve is dumping water all over the roof.
I've added a metre of pipe to the overflow, and it still keeps coming.
Any adjustment to the NEFA valve cuts down the pressure in the taps (to virtually nothing if I want), but still dumps it out the top.
Is it possible the wrong header set valve is installed.
I work with hydraulics, and am familiar with reliefs, just not with water heating systems.
Alternatively, what would i be looking at financially to have some king of a pressure relief cap fitted instead and lose the 3 metres sticking out of my single story house?

Linkback: https://www.plumbers.nz/q-and-a-valves/49/ineffective-nefa-valve/607/

Thanks Robbo.
Plumber will be sorted this week. I fancy losing the vent, so more to it than my handy man skills.