The metal housing will be warm to hot. I think my md100rlt is warm, my wife with her cat paws thinks it is hot. If it is still quiet, all is probably normal as long as you go through Tangster's quick check. The wet end should not be hot. Now the housing on my 1.5hp return pump gets quite toasty...
_________
300 Reef; 325LR, 1/2" sand bed in tank, 3" sand bed in 215 gal sump/refugium and Berliner PowerPro SS twin becket skimmer. 210 Reef; with 225 lbs of LR, 300 lb DSB, Large W/D and Jebo 520 skimmer modified to accept a becket. 90 RR FOWLR; tied into the 300's sump with a closed loop for extra circulation. 55 hospital. | 
External pump kind of hot 
