First, 45C isn't so hot you would need to snatch your hand away. Its only 8C warmer than body temperature.
Were you running with the radiator fan turned off? If so, this is unrealistic. Try it with the fan on.
I ran my setup with just the pump and 10ft of tubing for about 90min. The pump got a little warm, and the tubing barely got warm to the touch. This was with no radiator at all.
The Eheim 1250 consumes just as much power as the Via. It has a much bigger housing though, so will likely not get as warm.
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