JJM Water Heater pressure valve

[bmm32005]

Tartan 3800, 1994 with an JJM water heater that has a dripping "hot water outlet w/pressure temperature safety valve". That's how it's described in the info that came with the boat.
It is mounted in a bronze T fitting that is installed on the tank and is also the hot water outlet. I'll try to attach a picture of the valve.

I searched the web to try to find the valve and JJm water heaters but no luck.

Any ideas?

[sailormed]

Can you post a picture of the complete assembly? I have the impression it is the pressure safety relief valve.
When the cold water is heated is expands and the pressure increases. To prevent the tank from blowing up, the pressure relief valve “leaks” a small amount of water to bring the pressure down. On my boat the outlet of the relief valve is to the outside of the hull, but on other boats in can be to the bilge.
So the “leaking“ of that valve only means it is doing its job.