Tanks vary greatly in relation to cost per litre of water storage and we have provided an analysis of this to help you to understand how this works and why. We have also provided a comparison to Poly tanks and an explanation of why steel tanks are a better option.
As you can see in the graph, steel water tanks become more economical as they get larger. Steel water tanks, with an average cost per litre of 7c (Perth WA), have a significantly lower cost per litre than many Poly tanks, which can be over 50c/litre for some of the smaller sized tanks.