What are the cost savings from a rainwater tank?
Most people use their tanks to water their garden. On average, a garden hose will use 16 litres of water per minute. If you were to water your garden for 30 minutes twice a week, over the course of a year you would use around 50,000 litres of water at a cost of $55 (assuming a tariff of $1.10 per 1,000 litres). If you were to install a 5,000 litre tank, you could save $2600 in watering costs over the life of the tank.* More people are using their tanks to flush their toilets. An older style toilet uses around 12 litres per flush. Assuming a household of 4 people and an average of 5 flushes per person per day, around 88,000 litres or $97 is flushed down an older style toilet each year.
