We recently moved into a new 3200 sf home, and there are only two of
us. We have two 40 gal hot water heaters in the attic; one serving
downstairs, and one sserving upstairs. The only time the upstairs is
used is when we have guests, which in not often. We have a large
whirlpool tub that my wife likes to use, but the 40 gal heater is
barely enough to get water above the jets. How difficult would it be
to connect the two heaters together to be able to take advantage of the
extra capacity just for use of the tub? Would like self-perform the
work, and I am pretty handy. Just don't want to screw something up,
since I am not really that familiar with plumbing. All plumbing piping
in the house is poly.

Thanks for any help.

R