Most builders are loyal to a single line of equipment. Equipment from the 4 major manufacturers (Jandy, Hayward, Pentair, Sta Rite) are all fairly similar in quality.

From a pump perspective, Jandy makes a pump that competes with the other companies' high end pumps (IE: Hayward Northstar, Pentair Whisperflo).

Cartridge filters are fairly similar from one to the next (my opinion).

I dont know anything about Gas Heaters, but Jandy's Heat Pump line is as good as it gets (similar to AquaCal)

I would say that Jandy Controls are the best, but some will argue for the Pentair IntelliTouch.

The Chlorine Generators (Hayward Aquarite, Jandy Aquapure and Pentair IntelliChlor) are all relatively similar. In my mind, Autopilot makes the best unit.

Jandy Valves are very good.

Also, Jandy probably offers the builder some very nice incentives to sell their product. But again, if you use Jandy for your whole equipment set, you will probably get some kind of extended warranty.

Brad
Waterworks Pools