Solar water heaters save money

With the economy being as bad as it is, I’ve been looking at ways to cut my monthly bills while I still am making some decent money.  I found a solar hot water kit that teaches me how to install a solar water heater.  I think this will save me a ton of money, especially since my wife loves to use the jacuzi tub in our master bathroom.  I like the tub too once in awhile, but it takes the whole hot water tank to fill it!  Using that tub twice a week really makes our gas bill alot of money.