quick note on the £23 tam105 copies
just wired one up (first one I've wired up)
with the top cover off, you can see down into the motor, and there's a far bit of empty space there... the motor windings are a good inch and a half shorter than the motor body
photos...


supposed to be 370watts vs a tam 300watts (iirc)
less coper fill normally means less power
but I guess these motors could just be less efficient... mine has been running fine, pumping just as much as the tam105 it replaced
on the up side... there's a small hole in the bottom of the pump body... so if the pump seal go whatever is being pumped should drip out of that hole instead of filling the motor housing :-)