What Gerry Says... Of Course.
Hi,
Thanks to a little prodding, someone helped me remember...
No disagreement with anything Gerry says, that would be nothing but foolish... :gw
I am assuming this is the same pump referenced here
http://www.barrreport.com/showthread.php/6462-Blue-Line-55-HD-Pump-Manual.
As far as I can tell even without Gerry's suggestion you are not using 10 feet of head. The BL 55 HD is rated for 28 feet of head.
I have been running mine for a couple of years at 12-13 or so feet of head loss and the pump is not running hot, also I am drawing something like 150-155 watts. Measured water flow is better than 450 gallons per hour. I am try to figure a good method of measuring added heat, it appears to be less than 1.5 C, but I have little confidence in that figure.
The pump itself seems warm to the touch, certainly not hot. I have a fan set up to move air that is rarely above 85 F (29 C) through the area.
I say all of this to say I think there is a problem with your pump, however it came about. It might be worth having a pump person take a look.
Biollante