Built for Tight Spaces.
Ready for Council
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Promax Slimline Tanks are engineered to meet New Zealand’s toughest urban building constraints. Low-profile, high-capacity, and delivered with free PS1-certified seismic restraints.
Our tank are made from a one-piece UV-stabilised polyethylene body with integrated seismic restraints arrives ready to bolt down, certified to AS/NZS 4020 (potable water) and comes with a PS1 for the seismic restraints.
Browse Slimline Tank Range
- Low height profile meets NZ height-to-boundary rules.
- Free seismic restraints supplied – no extra kit, installs 30 % faster.
- One-piece body – zero joins, welds or internal bolts that can leak.
- UV-stabilised food-grade material with a 5-year warranty.
- Integrated pump cover on 2000 L, 3000 L and 5000 L models.
- Super-narrow 1000 L (310 mm) ideal for gardens
Browse Tank & Pump Combos
- Factory-assembled packages that cut on-site labour
- 50 LPM jet pump, at mains pressure.
- Automatic mains change-over device included and pre-plumbed.
- Ready to bolt down and connect.
- Two-year pump warranty, AS/NZS 4020 approval.
- Ready for use as dual-purpose retention/detention tank
Watch Our Slimline Tank Overview
Dive into our blog
6 Reasons Why Builders, Drain Layers and Plumbers Choose Promax Slimline Tanks
New Zealand's urban development means plumbers, builders, and drainlayers face the challenge of adapting to shrinking residential spaces. Section sizes have decreased significantly over the past three decades, with new builds now occupying median sizes of less than 500 square meters. As these changes reshape the construction and plumbing industry, the need for innovative solutions becomes paramount.
Installation and Council Compliance
- Seismic restraint with PS1 included – suits residential, commercial and industrial builds.
- Height-to-boundary compliant for most councils – perfect for resource consent.
- Free installation guide covers stormwater detention and rainwater-reuse set-ups.
- Pre-moulded 25 mm outlet and extra boss positions simplify council inspection.
Need documents now?
Tick “Send Slimline Specifiers Pack” in the form and we’ll email CAD/PDF drawings, the PS1 certificate, plus install and maintenance guides.
For drawings, seismic information or expert advice, call 0800 77 66 29 or use the enquiry form below.