Pffft, 87F is nothing
I put a compunurse on my maxijet1200, and the temps came out to 50C, or about 122F (this was with fans off tho). Those 20W of heat it consumes go a long way, lol. Needless to say, I'm downgrading to the maxijet900, 230GPH at 8W.
The submersable test works well for submersables, but you could also setup a tiny loop with some spare crappy tubing with no block or rad, then see how warm the water and pump get.