I have a cheap utility pump that I use to do water changes in the winter when I can't siphon out into the backyard. Many Discus people use pumps to do water changes, especially if they age water.
What are some good & cheap submersible pumps? I think this would save me a lot of time from walking up and down the stairs carrying a 5g jug lol
I use the water pressure to suction the substrate but once I'm done I turn it off and let the syphon do the rest. Takes awhile but I usually do it on Sundays while watching football.

Why use electricity if you don't have to? I just went with pool hoses to drain my larger tanks. I still use a pyton for gravel washes since I have better control over substrate losses with it than with the 2 1/2" diameter pool hose.