I just installed a new pump into my system, the ViaAqua 1300. I have heard from others that the pump is warm to the touch. I didn't see anything mentioned about it heating the freaking water up! I thought (hoped?) the heat would have dissipated through the pump instead of the water, well guess what? I opened up my case last night to check on things. The computer had not been run since the day before. The pump is on all the time. I touched the waterblock and well, it was warm to the touch. It was not cool like most metals at room temperature. I felt the water lines and they too were warm. So, I booted up the computer and went into the BIOS to check out the cpu temp. It was 35C at boot up! It has never been that. It always boots up around 27C. Well, guess it is time to break out the cash for an Eheim. Are the Eheims cooler? Anybody had these experiences with the ViaAqua? Should have listened to my gut instinct.