I installed the aluminum pump (Graf) on the wife's Tiguan and it has worked great since. Have put 40K miles on the metal pump and no issues.
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Italy
GRAF makes this particular pump without the magnetic impeller, and it’s the best option.
Graf is good. They are an OEM (original equipment manufacturer)
I run a Graf pump myself for about 2 months now and it's working fine so far.
In my case the leaking was from the plastic water pump housing which is a common fault for this engine. I replaced the plastic water pump with GRAF PA1359, which is metal housing instead of the OEM plastic one.
I've run the plastic pump on 2 different cars for over 100k no issue, in fact I only changed one because the thermostat went bad and the water pump's reputation. I do have the metal Graf pump now, I like it so far.
I think I'll just grab a GRAF 30mm unit and compare unless someone has good info on brand quality/fitment.
I had the same problem when I put in the all aluminum graf waterpump. It had a bad thermostat right from the factory, I replaced the thermostat after trying all sorts of coolant bleeding, temp logging, etc. The oem thermostat solved the problem.
Yeah... That Graf pump did not work out... Had to remove Graf pump and get the proper pump from local VW dealer.
I had a Graf pump as well and it blew up less than a year later, literally the shaft blew off while I was in traffic.
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