I have a local copy of the EPC but initially I googled the part number.
I think the 170HP limit was more about the size of the elements, the pump should be good for a lot more (8mm elements anyone )
But even at 170HP I imagine the pump would need to have been tweaked by one of those Northern European master pump yogi's.
Why are they all in those places? Maybe the spending their cold dark winters in the shed has something to do with it. I'll be at the beach!