I recently (yesterday) had to replace our quickly failing water heater. I did my research as usual and decided it would be a task I could handle, especially when I saw a tip on the Sharkbite water heater connectors. I have done plumbing with copper and have sweated my share of pipes, but it's never fun for me, because I don't enjoy getting burned; like I usually do with a torch and hot dripping solder. I know it's cheaper to solder, but as a non-professional home repair person, save yourself some trouble and time and spend a few extra bucks on these handy inventions. I had the water heater installed in about a hour and hot water in two hours -- not bad for a amateur, if I say so myself.
I can't say enough about how much I like using their products whenever I have to do some pluming work around the house. http://www.sharkbite.com/usa/
Picture of installation -- note the S in the right (hot) side. This is where the feeds did not match up between the old and new heater. The sharkbite makes for an easy match-up without having to do some screwy soldering work.
PS: I also used their products to install a new sink, faucet and disposer last year and was very impressed then, so I had no qualms about using them on the water heater.
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