Rainwater Harvesting South Africa collects roof water through gutters and downpipes into a tank, for gardens, washing and, with treatment, other household use. Describe your property once and compare quotes for the gutter and tank system.
- The gutters and downpipes do most of the collecting, so they must be in good shape.
- Untreated rainwater is not automatically safe to drink.
Describe the job once and compare rainwater harvesting quotes.
Get Rainwater Harvesting QuotesHow a Gutter-to-Tank System Works
- Roof and gutters collect rain. See gutter installation.
- Leaf screen or rain head removes leaves at the downpipe.
- First-flush diverter sends the dirtiest first water away.
- Downpipe and pipework carry water to the tank inlet. See downpipe installation.
- Tank stores the water, on a level base.
- Overflow takes excess water safely away.
- Pump or tap delivers the water where it is needed.
Gutter Collection
- Check the gutters are clean, sealed and falling towards the downpipe feeding the tank.
- Several downpipes can be joined to one tank with extra pipework.
- Roof material matters: some old roof coatings and lead flashings are not suitable for collecting water.
- Overhanging trees add leaves and bird droppings to the water.
Leaf Screening
A leaf catcher or rain head at the downpipe stops leaves entering the tank. Gutter guards reduce debris further. Screens must be cleaned, or water bypasses them.
First-Flush Arrangements
The first rain washes dust, droppings and debris off the roof. A first-flush diverter fills with this water first and lets cleaner water through to the tank. It needs emptying and cleaning regularly to keep working.
Tank Connections
- Inlet with a mosquito-proof screen.
- Tank on a level, strong base or stand; a full 5,000 L tank weighs about five tonnes.
- Outlet tap or pump connection near the base.
- Before connecting to household plumbing, check municipal by-laws and use a qualified plumber.
Overflow Management
In heavy rain the tank fills quickly. The overflow should be screened, sized at least as large as the inlet, and piped to stormwater drainage or a soakaway well away from foundations and neighbouring property.
Water Quality
Untreated rainwater can contain bacteria, dust and debris from the roof. It is generally used for gardens, washing cars and flushing toilets. Drinking it needs suitable filtration, disinfection and testing.
Rainwater Harvesting Prices
| Item | Ballpark price |
|---|---|
| Water tank, about 2,400 - 2,700 L | R2,800 - R5,150 |
| Water tank, about 5,000 - 5,250 L | R6,000 - R6,900 |
| Tank installation, 2,000 - 5,000 L | R3,000 - R4,000 |
| First-flush diverter | R400 - R1,200 |
| Leaf catcher or screen | R150 - R400 |
| Mid-size system with 5,000 L tank and pump, installed | R12,000 - R40,000 |
Ballpark figures, not quotations. Compiled from price guides and retailer listings published on South African websites (dated 2025 to January 2026, plus undated retailer listings), checked 15 October 2026 and rounded. Sources disagree, and most installed rates come from Gauteng guides, so quotes in your area can differ. Retail tank prices change often; Cashbuild prices appear to include VAT. Unless a row says so, the sources do not state whether VAT is included, so confirm VAT on every quote. Photos or a site visit and a written quote set the actual price.
Tank systems are often installed with new gutters and downpipes. Gutters South Africa gets quotes for the gutter side of the job.
Free, with no obligation to appoint anyone.
Get Rainwater Harvesting QuotesFrequently Asked Questions
Is harvested rainwater safe to drink?
Not without treatment. Untreated rainwater can carry bacteria and roof debris. Use it for gardens, washing and toilets, or install filtration and disinfection and have it tested.
What size tank do I need?
It depends on roof area, rainfall and what you will use the water for. Many homes start with 2,500 L to 5,000 L for the garden.
Do I need permission to install a rainwater tank?
Rules differ by municipality and estate. Check by-laws and HOA rules, especially before connecting a tank to household plumbing.
What does a first-flush diverter do?
It diverts the first, dirtiest water off the roof away from the tank, so cleaner water goes in.
Can I connect all my downpipes to one tank?
Often, with extra pipework. The pipe runs and fall to the tank must be planned so water flows and overflows correctly.
Related Services
Gutters South Africa is a free quote-comparison service. Work is assessed, quoted and carried out by independent contractors, and your agreement is with the contractor you appoint. Ask each one for a written quote, what is and is not included, proof of insurance and the payment terms before paying anything.
Rainwater Harvesting South Africa. Describe your job once and compare quotes from independent contractors.
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