New Zealand's original
slimline tank

In 2013 Thin Tanks NZ were the first slimline tanks to enter the market.

Designed for easy installation and aesthetic appeal, our tanks come in a range of 13 Colour Steel based colours to suit your property or development. We can also offer design assistance and ongoing support from our team. 

We're New Zealand owned and supply nationwide. Contact us today for a free, no-obligation quote.

Contact Us

Detention or retention?

Thin Tanks can do both.

Our Thin Tanks are engineered for both detention and retention use — ideal for residential and commercial settings where space is tight but aesthetics and performance matter.

Whether you're managing stormwater or harvesting rainwater, our tanks adapt to your needs:

Detention tanks temporarily hold runoff and release it slowly into the drainage system — helping reduce pressure on stormwater infrastructure and mitigate flooding.

Retention tanks store rainwater on-site for your own use. This gives your home a dependable, self‑sustaining water source for gardens, household use, and a back-up supply during dry periods. 

View Our Range

Meet New Zealand’s thinnest 1000L water tank

Engineered for tight spaces and modern living.

With a sleek, space-saving profile and generous capacity, it’s the perfect solution for urban homes, compact sites, and stylish outdoor setups.

Whether you're harvesting rainwater or boosting your backup supply, this tank delivers performance without compromise.

More info

Stylish, space-savvy rainwater storage

Our rainwater tanks are designed with aesthetics in mind - sleek, modern, and easy to integrate into any outdoor space. Whether you're working with tight areas or looking to create functional boundaries, our tanks offer flexible placement options that blend seamlessly into your residential or commercial environment.

How our tanks transform outdoor living

  • Alongside fences for a streamlined look
  • Against house walls to maximise unused space
  • As part of internal courtyards for added privacy
  • To screen off neighbouring properties
  • As dividers between apartment outdoor areas
  • The opportunities are endless

Designed for New Zealand conditions

Our slimline rainwater storage tanks are proudly New Zealand/Australian made, and crafted from 100% UV-stabilised, food-grade polyethylene for long-lasting durability and safety.

Engineered for resilience - each tank has been tested for seismic and wind strength, with Producer Statements available from certified New Zealand structural engineers.

Council approved and recyclable, every tank is designed with sustainability in mind - from start to finish.

Thin Pots

Elevate your outdoor space by attaching Thin Pots to your Thin Tank - creating a vertical garden!

The Thin Pot Vertical Garden System is purpose-built to complement the 500L, 1000L, 2000L, 3000L and 4000L Thin Tank models, turning your water storage into a lush, green feature.

Discover Thin Pots

Testimonial

“At Laser Plumbing East Tamaki, we’re proud to work with Thin Tanks NZ and recommend their products to our clients. The build quality, design, and installation efficiency are excellent, and the support team is consistently reliable. They deliver a level of quality we’re confident putting on our jobs.”