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nexxo · 10-12-2003, 02:34 PM

Basically it all depends on how the impeller of the pump is driven by the motor bit of the pump. In a magnetically driven pump, there is no direct physical connection between the motor shaft and impeller; the driving force is transfered by magnets (hence the name...).

In a direct drive pump, the motor shaft is connected to the impeller and water is kept in the pump housing by a watertight seal around where the motor shaft enters the impeller housing. This is a less desireable setup, of course, but also cheaper.

As such a magnetic drive pump can be run in most positions, including upright and upside down, sideways etc. (but not sideways with the outlet pointing down, because that could trap air bubbles).

A direct-drive pump relies on its seal and is best run upside down, with the seal on top, so to speak. To run it with the inlet up means that there is more chance for gravity to assist water leaking through the seal.

The Danner and Swiftech pump (like Eheims, and many others) are magnetically driven, so they're all safe.

10-12-2003, 02:34 PM	#4
nexxo Cooling Savant Join Date: Jul 2002 Location: Brimingham, UK Posts: 385	Basically it all depends on how the impeller of the pump is driven by the motor bit of the pump. In a magnetically driven pump, there is no direct physical connection between the motor shaft and impeller; the driving force is transfered by magnets (hence the name...). In a direct drive pump, the motor shaft is connected to the impeller and water is kept in the pump housing by a watertight seal around where the motor shaft enters the impeller housing. This is a less desireable setup, of course, but also cheaper. As such a magnetic drive pump can be run in most positions, including upright and upside down, sideways etc. (but not sideways with the outlet pointing down, because that could trap air bubbles). A direct-drive pump relies on its seal and is best run upside down, with the seal on top, so to speak. To run it with the inlet up means that there is more chance for gravity to assist water leaking through the seal. The Danner and Swiftech pump (like Eheims, and many others) are magnetically driven, so they're all safe. __________________ "There is a thin line between magic and madness"