The Facts on Rainwater Tanks
Tanks range in capacity, shape, materials, colour and use.
Capacity
The capacity of rainwater tanks for residential areas usually ranges between 1,400L and 14,000L.
The size of the rainwater tank needed will depend on:
- Rainfall in your area
- Roof area available
- How you plan to use the rainwater
- The number of people living in your house
Shape
Cylindrical polyethylene tanks are generally the cheapest type of rainwater tank on the market. Slimline tanks require more material to maintain structural integrity to hold water and are therefore more expensive. Super slimline tanks connect together along a wall or can be used as a fence. Sacs, which are flexible, inflatable tanks are suitable for tight sub-floor spaces and are good for properties with limited space. Underground concrete or polyethylene tanks are also available if you have limited space to capture rainwater and stormwater. Underground tanks can be more expensive and require excavation work but will save on space.
Material
Tanks can be made of galvanised steel, concrete, fibreglass, or polyethylene and sacs are made of POWERC/geotextile.
Colour
For those conscious about colour, rainwater tanks are available in a range of shades to suit any household colour scheme.
Use
The NSW Department of Health supports the use of rainwater tanks for non-drinking purposes in urban areas. The water can be used for flushing toilets, washing clothes, in water heating systems and for outdoor use such as watering gardens, washing cars, filling up swimming and ornamental pools and fire fighting.
NSW Health does not recommend the use of rainwater for cooking or drinking when public water supply is available.
Contact one or all of our preferred suppliers to discuss your needs and budget to determine the best type of tank for your purpose.
You can also visit the Tankulator website to quickly calculate what size rainwater tank best suits your needs. The Tankulator has been developed by the Alternative Technology Association (ATA). It is a free online tool to help you plan for a new rainwater tank or improve the performance of an existing tank. The tool calculates how much rainwater can be harvested using local rainfall data, your roof type and size and flushing and overflow capabilities. The website also includes information on material types, tank positioning, filters and pumps.
Financial Incentives
Rebates
The Australian Government has announced it will no longer provide rebates for rainwater tanks or greywater systems from 10 May 2011. Systems purchased prior to this date must apply for the rebate by 10 November 2011. The Australian Government's Department of Sustainability, Environment, Water, Population and Communities, phone 1800 808 571, has more information.
Sydney Water has information about rebates and services offered by it.
Fact Sheet