Graf here. 15k miles/ 2 years, no problems.
I use on my 12v and 24v VR6 engines, Eurowise aluminum thermostat housing and 42DD stainless steel crack pipe. Water pump I use GRAF or Hepu for its metal impeller.
Graf & Hepu brand water pumps are both metal impeller high quality oem suppliers
I also used a kit from FCP Euro about 8 years ago and it included a HEPU water pump that worked fine for 7 years until I dismantled that car.
If it *is* leaking you might want to consider replacing it with a Graf alloy-bodied pump which won’t be affected by heat and exposure to oil, the usual causes of eventual failure of the plastic pumps.
my hepu has been in for 9 years with zero issues
I've also had a Graf I think it was, it did have a metal impeller, which started leaking after 7 yrs.
what I had problems with is with Graf water pump, that was included as part of FCP euro cooling system kit, water pump seal around the bearing started pouring coolant like a waterfall after only 11k miles, I replaced it with a Stewart pump
I am dealing with a similar issue right now on my CJAA which I changed the timing belt in April this year. Leaking from same spot. Hepu waterpump.
a Hepu which went seven years/60,000 miles before it started leaking. I think the additional mass of the metal impeller put more stress on the bearing and seal.
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If choosing water pump across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare water pump across these categories:
In March 2026 on PartReview, water pump GRAF were overall better than Hepu.
In March 2026 on PartReview, water pump GRAF were overall more popular than Hepu.
By vote balance, water pump GRAF surpassed Hepu:
By number of reviews, water pump GRAF surpassed Hepu:
In March 2026, according to PartReview, water pump GRAF led more car-specific ratings than Hepu:
GRAF are chosen by owners of cars such as: Volkswagen Jetta, Volkswagen Tiguan, and others.
Hepu are chosen by owners of cars such as: Volkswagen Phaeton, and others.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of water pump GRAF with: OEM Volkswagen, OEM Audi, AISIN, Gates, Pierburg, OEM FORD, OEM BMW, OEM Toyota, GMB, Saleri.
Also available: comparisons of water pump Hepu with: OEM Volkswagen, OEM Audi, AISIN, Gates, Pierburg, OEM FORD, OEM BMW, OEM Toyota, GMB, Saleri.
You can also see who is better among other water pump manufacturers: OEM Audi or OEM Volkswagen, GRAF or OEM Volkswagen, AISIN or OEM Volkswagen, Gates or OEM Volkswagen, Hepu or OEM Volkswagen.
