Those idle temperatures on water relates to my already high ambient temperatures of ~27c ( or 82f ) because i live in the Caribbean island of Puerto Rico and i did not have my Air Conditioner on. It's doing pretty good for such high ambient temperatures 24/7 365 days a year where i live , there's not such thing as winter in Puerto Rico , no snow or cold weather over here , it's always summer time in Puerto Rico ~27c every day . Water cooling like air cooling always will be dependent on the ambient temperatures hence why my temperatures even at idle can never exceed the ambient temperatures at this time of 27c ( Unless i go sub-zero on Liquid Nitrogen , but i already retired from extreme overclocking , so no more Liquid Nitrogen Benching for me ). As the fellow Guru already explained water cooling do exceeds at full loads and not idle temps. What's your ambient temperatures like ?