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Table 2. Cost estimates for supply and installation of above and below ground rainwater tanks or a single installation in Sydney
| Tank size | Tank type | Tank shape | Approximate tank supply cost |
|---|---|---|---|
| 1.5kL | Galvanised steel, aboveground | Round Rectangular / ovular | $2,470 $2,870 |
| Colorbond finish with a polymer type liner, aboveground | Round Rectangular / ovular | $2,570 $2,970 | |
| 3kL | Galvanised steel, aboveground | Round Rectangular / ovular | $2,970 $3,470 |
| Colorbond finish with a polymer type liner, aboveground | Round Rectangular / ovular | $3,320 $3,820 | |
| 5kL | Galvanised steel, aboveground | Round Rectangular / ovular | $3,170 $4,280 |
| Colorbond finish with a polymer type liner, aboveground | Round Rectangular / ovular | $3,620 $4,600 | |
| 9kL | Galvanised steel, aboveground | Round | $3670 |
| Colorbond finish with a polymer type liner, aboveground | Round | $4,120 | |
| 5kL | Below ground (Rocla Eco Rain) | - | $7,800 (plus $800 for reticulation to toilets) |
| 10kL | Below ground (Rocla Eco Rain) | - | $11,050 (plus $1,050 for reticulation to toilets) |
Table 3. Prices for polyethylene (plastic) rainwater tanks
| Tank size (L) | Tank type | Approximate tank supply cost ($) |
|---|---|---|
509 | Slim line (aboveground) | $491 |
700 | Tall round (aboveground) | $418 |
720 | Slim (aboveground) | $501 |
758 | Round (aboveground) | $511 |
1,074 | Slim (aboveground) | $766 |
1,179 | Round (aboveground) | $521 |
1,250 | Round (aboveground) | $550 |
1,400 | Tall slim (aboveground) | $792 |
1,615 | Round (aboveground) | $551 |
1,800 | Under house (aboveground) | $1,122 |
2,100 | Tall slim (aboveground) | $1,144 |
2,281 | Slim (aboveground) | $1,271 |
2,499 | Squat (aboveground) | $601 |
2,500 | Round (aboveground) | $682 |
2,500 | Twin under-deck (aboveground) | $1,122 |
2,542 | Tall (aboveground) | $601 |
2,800 | Tall slim (aboveground) | $1,496 |
3,600 | Twin rectangular under house (aboveground) | $2,244 |
4,125 | Squat (aboveground) | $901 |
4,885 | Medium round (aboveground) | $901 |
5,000 | Round (aboveground) | $968 |
9,000 | RT poly tank (aboveground) | $1,595 |
9,609 | Large squat (aboveground) | $1,850 |
10,478 | Large tall (aboveground) | $1,500 |
10,500 | RT poly tank (aboveground) | $1,705 |
13,500 | RT poly tank (aboveground) | $2,024 |
15,064 | Large (aboveground) | $1,850 |
22,500 | Low profile (aboveground) | $2,376 |
22,500 | RT poly tank (aboveground) | $2,640 |
24,180 | Large tall (aboveground) | $2,551 |
25,090 | Large low profile (aboveground) | $2,551 |
29,560 | Very large (aboveground) | $2,950 |
38,334 | Very large (aboveground) | $4,170 |
| 47,950 | Monster (aboveground) | $5,152 |
Grant and Hallmann (2003) estimated the costs associated with a 2,250 litre plastic tank with a life span of 30 years as: $510 purchase; $38.50 (delivery); $270 (for plumbing costs that allow toilet flushing and garden watering to use tank water); $350 (for the pump); $100 (electrician costs). They also assumed the pump would last for 15 years, and the cost of running the pump (in Melbourne) was estimated to be $0.1368/kwh.
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