Why we install Rainwater tanks in new houses?
There should be no reason we as the home owner should install unless you don't have mains.
The cost of tanks and install and plumbing into your home far out weigh the cost of mains water
Check your next water bill, the actual cost of water is reasonable but its the cost of supply, sewer and any other levy that makes your bills 2x the price, also check your last 12 months water consumption and then work out the cost in tank to hold all that water....then work out where you would put alllllllll those tanks and then........hope it pours downs with rain once every 2 weeks to keep water in those tanks. If you have limited room can and still want to do your bit for the environment you can purchase a slimline modular for a $1 per Litre.
Its actually cheaper to go to Coles to purchase 10L of spring water at the cost of $5 than install tanks.
So a couple of 1000L tanks is hardly worth your hard earned $$$$
Also if you are on mains and you do install tanks and you are full self sufficient in water use, you will always have the pleasure of receiving your full cost of supply from mains even if you didn't use a drop just because you have a metre;D you would be lucky to see your bill halved.
Oh yeh, and in the case of a draught, thanks to our Labor government we all have a endless supply of fresh water (actually they claim its better than rain water
)from all those new desal plants at the cost of billions, don't forget we will be paying for those too
So why do we need water tanks at home again, my guess is few polies are on the take again.