I called HWH today and talked to tech support. I told them the system worked great when the site was not level and not so great when site was level. They said the reason is that when the site is level the HWH automatic leveling sytem does not activate. Since it is not activated the auto-level is not working. I guess that is why it leans a little over time just like when it is in storage.

I have a HWH Series 680 system, not sure how other HWH systems work.

Terry