When steel makes sense
Steel tanks suit properties where a non-combustible tank is needed, such as a dedicated fire-fighting supply on a bushfire-prone block, and large rural storage where modular liner tanks can reach capacities beyond a one-piece poly tank.
What to ask your installer
- ✓Which steel and liner is used, and what the manufacturer’s warranty covers
- ✓How the base or ring beam will be prepared
- ✓Whether a 65mm Storz outlet is needed for your fire-fighting supply
- ✓How the outlet, pipework and valves will be protected from frost
- ✓Who handles the plumbing connection (a licensed plumber)
Bushfire-prone properties
Under NSW RFS Planning for Bush Fire Protection 2019, where a dedicated fire-fighting water supply is required (usually on properties without town water), it is commonly 10,000L for lots of 1,000–10,000 m² and 20,000L for lots over 10,000 m², with a 65mm metal Storz outlet and ball valve, metal pipework, and a hardened surface for a fire truck within 4 m. Above-ground tanks for that supply need to be concrete or metal. Exact requirements depend on your development consent and bushfire assessment, so check with your certifier or NSW RFS. More on fire-fighting water tanks.
Highlands conditions to plan for
Cold winters mean exposed pumps and pipework need frost protection. Many properties are mapped as bushfire prone, which can affect tank material and outlets. And a full tank is very heavy, so the base needs to be level and compacted. More on rainwater tanks in the Southern Highlands.
Frequently Asked Questions
Should I choose poly or steel for a bushfire-prone block?+
If the tank is your dedicated fire-fighting water supply, NSW RFS guidelines call for above-ground tanks made of concrete or metal, so a steel tank (or an underground tank) is the usual choice. For household rainwater only, poly is also an option. Your BAL rating and development consent decide what’s required, so check with your certifier or NSW RFS.
Are steel tanks bigger than poly?+
Modular rural liner tanks can be built to much larger capacities than one-piece poly tanks, which suits farms and large acreage. Ask the installer what fits your site and access.
How Highlands Tank Pros works
Highlands Tank Pros is a local lead-matching service connecting Southern Highlands property owners with independent, licensed plumbers and rainwater tank installers. When you call or send a request, we pass your details to a local installer who contacts you to quote. The installer you’re matched with is responsible for the work, its pricing and any warranties.