how hot is too hot for a porty pump?

i generally try not to put scalding hot tap water into my tank, at the risk of messing up my pump. i get the water hot enough that i can leave my hand under it for a few seconds, but thats it. i would guess only around 110-120* or so. My pump is made by pump-tec for what its worth

so how hot do you add water to your tank, without having any internal or external heater?