This is a question people in South Africa often wonder about. Is Rainwater Collection Roof really worth the trouble?
That is not the biggest advantage through; the biggest advantage is that you will be able to keep your garden in tip top condition even when water is scarce without sending your account through the roof!
Where I stay, water is so scarce sometimes that we have water restrictions. Then you have to see all your hard work in the garden going down the drain! So, having a tank full of rainwater to use in such times is really a very big advantage.
But, even if you never have any scarcity of water, the potential saving is still worth it. Even if you are not that big into gardening, you can use this extra water for your swimming pool, to wash your car and to wash the paving down. So, even without a garden you will still be able to make use of the rainwater you collected from your roof.
So, I really think looking at rainwater collection roof is a good idea for everyone.