Just to let you know, I've begun the process of digging into this issue. One of the apps engineers at Pentair is sending me some stuff, and I'm going to talk to apps engineers at Leviton and Square D.

But, the process is complicated by the fact that the Pentair (and probably Hayward) marketing departments will go ballistic if there's any official discussion of the problem

As a heads up, at first glance, it appears you should plan for ~$300 PLUS installion labor for reasonable protection, with "reasonable protection" being defined as "likely to protect you from a neighborhood strike, but not at all likely to protect from a strike within 100 feet of your house".

There are some other things you'll want to do. A high quality, well connected, full size copper ground wire from your house panel continuously to your pump service panel is essential. Conduit (non-wire) grounds are NOT OK - you MUST have copper wire from the panel to the pump. Otherwise, transient voltage surges (like strikes) can create an electronics-frying "ground loop" between your pump, your house panel, and the "bonding" wiring. (http://en.wikipedia.org/wiki/Ground_...electricity%29 )