This pump is as handy as a doorknob, is somewhat challenging to install, but works as advertised. If you're particularly adept at home and plumbing repairs, I'd recommend taking a shot at it. Otherwise, get a plumber to crawl under your sink & into your water heater closet. You might need some additional tools/hoses/parts, but you'll be happy with the results; I know that we are. You might find that an external timer with multiple ON/OFF cycles is handier than the built-in timer. Finally, Amazon.com featured the *BEST* prices for the pump and manifolds, so you can't go wrong. If you want HOT water at the tap fast, this is definitely the way to go. Good Luck