"Tim Downie" wrote in message
...
Is is possible to use a speed controller (like a light dimmer) with a
small
pond pump?

I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more
powerful than I need. The motor has a solid rotor that appears to be made
of a ferrite like material.

I know that speed controllers can cause overheating problems with some
motors but given that it's underwater with water bathing the rotor, I
don't
imagine this would be a problem in this case.

I'd suggest the following...

1. Get a new smaller pump, and sell this one on eBay. Your electric bill
will thank you.
2. Attach a short piece of hose, and a valve downstream from the pump. It's
not a problem to restrict the output of the pump. You don't want to restrict
the input.

BV.