Originally Posted by pickles
I have two Iwaki pumps (40RLT i believe); even though the housing will handle boiling temps the impeller will not. it has a molded in "bearing" of sorts and will melt. Ask me how I know
I use one on my keg washer the other is an impeller less paperweight.
Really? I have a Resun (Iwaki knockoff) md40 and have used it with boiling wort no problem. From the Iwaki spec sheet there is nothing that would not handle the temps (both the housing and impellor are GRF-PP and the bearing is PTFE/Teflon). Are you sure you didn't dry run it? Sorry just checked and the thrust washer could be PE which if LDPE has a melting point of 105°C so might of been the issue, but you could replace this with a ceramic one.