Mark,
Hayward's standard Limited Warranty for this product is one year from the date of purchase. Exclusion apply for such things as damage due to improper installation, use & care, negligence, operation and freezing. Your might want to double check this on-line.
Also, unlike some other Pump Manufacture's, I think Hayward doesn't require that the pump be purchased & installed by a Pool Company/PB.
The same 1 Yr Limited Warranty would apply if it was installed by you ... but verify this either on-line or with Customer Service.
Regarding the $600 charge ... that's not a bad price if it includes the Pump, Plumbing, Valves, and Installation.
Now .... if you expect a certain level of post installation warranty performance/support from the pool company ... you better make sure it's all spelled out in your contract. Oral agreements won't be enforceable in Small Claims Court.
So make sure you clearly spell out that:
In the event the pump has to be replaced ... it will be a "NEW" unused pump;
Use of a rebuilt, reconditioned, or re-manufactured pump is prohibited.
The Warranty Installation of a "NEW" HAYARD SUPERPUMP II 1HP PUMP must be done in ____ hours/days after notification/verification of a problem;
No substitute PUMP can be installed without your approval;
The Pump's Warranty labor is part of the contract;
If they ever have to replace the pump ... you can ask Hayward to run the Serial Number to verify that it is in fact "NEW"
Good Luck!