I'm going to try it on some water heater anode rods. I had to use an 18 inch breaker bar with a 3 foot pipe extension to break those free with 2 people. We'll see how 1400 foot pounds do.
Not sure what water heater you were working on, but that kind of force would normally break a home unit, or break it's mounting. Some penetrant first would be good.
It's not the brute force of "1400 ft/lbs" (sic) as much as it is the hammer action of quick impacts that will make it work for you.
I have a Milwaukee 2860 rated 450/600 ft/lbs which will take off any car fastener including crank bolts.