By Sarah Chen · environmental engineer · water, waste and everything that flows downhill

“After my third borehole went dry and cost me $4,200, I learned that 'off-grid' in the outback means planning for the worst drought, not the best.”

Forget the fluff. I'm off‑grid in Australia and I built a water system that works without blowing the budget. No fancy tech—just the parts that keep the water flowing.

Float Valves: What I Do When They Jam

Float valves are the backbone. They keep your tank from spilling over. I grab the cheap plastic ones at Bunnings or Toolstation—fancy brass is unnecessary.

• Get a 15mm float valve (like the $15-$25 ones at Bunnings)
• Install it on the tank inlet. Not the roof tank – the storage tank. Duh.
• Test it. Fill the tank. If it doesn't shut off at the right level, replace it. Don't wait for a flood.

Pro tip: Put a bucket under the valve during installation. You'll thank yourself when it leaks (it will).

My Plumbing Rule: Keep It Simple

Complex plumbing = more things to break. Use 20mm PVC pipe. It's cheap, Australian-made, and won't melt in the sun.

• Run pipe from the roof tank to the storage tank. Use 90-degree bends, not elbows. Less chance of blockages.
• Use solvent weld (like PTFE tape) on all joints. No glue. Just tight fits.
• Put a 10mm tap at the bottom of the storage tank for emergency draining. $10 at Bunnings.

I steer clear of copper – it’s overkill and costs twice as much. PVC does the job for rainwater without the price tag. If you’re pulling water from a bore, fit stainless steel; that’s another conversation.

My Backup Pump: It’ll Fail, Here’s My Workaround

It's not if your system fails. It's when. Have a backup plan that costs less than a coffee.

• Keep a 200L drum (like the $50 ones from Farmbarn) as emergency water. Fill it from the mains when you can.
• Install a manual override tap on your main pipe. If the float valve jams, turn it off and use the drum.
• Never rely on solar pumps. They break. Stick to gravity feed. It's why we're off-grid.

If you're in a drought zone, get a second tank. Seriously. $200 for a 500L tank at Toolstation is cheaper than a water truck.

What my 2023 off‑grid water kit actually cost me

Here's what you actually need to spend (no markups):

• Float valve: $20 (Bunnings)
• 20mm PVC pipe (5m): $15 (Bunnings)
• 10mm tap: $10 (Bunnings)
• 200L drum: $50 (Farmbarn)
• Total: $95 (before you even turn a wrench)

Don't buy "off-grid kits" from online stores. They're overpriced by 300%. Do it yourself.

What the system costs and saves

I don't treat stock grid water like rocket science. It runs on cheap Aussie gear: Float valves, PVC pipe, and a backup drum. No apps. No subscriptions. Water appears when you need it.

If you're spending more than $100 on this, you're getting ripped off. Do it right. Or don't bother.

When I hand the job to a licensed tradie

While many off-grid projects are achievable as DIY, certain situations require licensed professionals:

• Electrical work beyond basic 12V DC additions — requires a licensed electrician
• Structural modifications to buildings or load-bearing elements
• Gas line installation or modification
• Solar array installations above safe voltage thresholds
• Any work that affects the structural integrity of your property

Always check local regulations and obtain necessary permits before commencing work.