yes, very true amps get very hot, but i doubt hot enough to boil water. by then the amp should of died by then. components can not get that not. i had a 400 watt amp with a audiobahn sub. it was bridged so it really got hot really fast. so i had a fan mounted on it. and after so 30 mins i started smelling buring so when i opened the trunk all you saw was smoke pouring. the amp died even with the fan and the amp had heat protection. so i sent it in for warranty. of course a lot of warranty is bs. the reciept said 04 and they tried to bs me saying it said 03. wtf?
anyways i got them to fix it. when i got it back. i turned the bass down some what. and cut some wood about 4 pieces each screw to mount the amp. and 120 mm high cfm output fan on the right on the bottom of the heat sink, so there is atleast 3 inches of space all around the amp. its like an amp on stilts. and then i put an 80 mm fan over the top of one other side of the heat sink. of course i had to run wire to near the driver so i could turn them on and off. and so far i've never had a problem.

you can really the temperature difference with the fan and without.
if your not running a lot of watts (300 or less) you shouldnt' have to worry unless its bridged and your running a lot of bass. if you have more than 300 bridged you should really consider a cooling system. no amp is 100 % efficient.