Promax Header Water Tank 120L

Our tanks are strong and durable and will provide years of maintenance free rain water storage.

Whether you require a compact tank for harvesting rainwater for your garden, bach or pool, or you are looking to top up your main water supply.  One of the many options available in the Promax small tank range is sure to meet your needs.

  • Maintenance free one piece moulded construction
  • Easy installation
  • Clean, fresh untainted storage for drinking water and household use
  • Free delivery to your area

$369.99 (incl. GST)

Code Description Capacity(L) Outlets(mm) Width(mm) Height(mm) Weight(kg)
PMXST00120HT Promax Header Water Tank 120L 120 1x20 660 510 1.5

Promax Corrugated tanks are so tough you can bury them up to 1 metre in the ground - and they still retain their 20 year warranty!

Often a project can have height restrictions but also the need for a large amount of water storage - the Promax Corrugated big tanks are a perfect solution to this problem.

There are 2,200 gallons in a 10,000 lt tank.

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5,500 gallons

All tanks over 10,000 lt are delivered on purpose built trucks.

Clearance required for truck and trailer is 19 metres long, 5 metres high, 3.5 metres wide.

The truck only (without the trailer) is 9 metres, 5 metres high and 3.5 metres wide.

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Installation costs vary from project to project - it depends on your exact situation!

We recommend you speak to your plumber or drainlayer to get a quote for installation.

No, all the tanks are made from material that complies with international food grade standards and are suitable for potable water. 

There is no plastic tainting or taste whatsoever.

The outlet fitting is 50mm from the base to the outlet hole. 

The lead time from order to delivery is approximately 5 - 10 working days. 

This can vary on time of year and where your property is located.

If you require your tank urgently or have specific delivery requirements talk to our customer services team - they will be able to help ensure you get your tank when you require it.

Our products are available to be purchased through most rural and plumbing merchants, because the size of the range they normally order on request however some do hold a standard range in stock.

Our customer services team will be able to help point you to a local stockist - call us on 0800 77 66 29.

If it is your primary source of water, most district councils require you to have a minimum of 25,000 ltrs. 

See full installation instructions and the installation video.

Installation instructions require a sand base/fine gravel pad and minimum 100mm thick and 300mm bigger than the actual diameter of the tank. 

The base needs to be compacted and level as when full, the 30000 lt tank will weigh 30 tonne.

Plastic tanks have lower transportation costs (our tanks larger than 10000 lt are delivered free!). 

Installation is easier and lower cost.
No need for heavy equipment to move/install.
Longer lifespan - concrete cracks when the ground shifts, and plastic is more forgiving, meaning they generally last longer than concrete!

Naturally black will attract more heat than a more neutral colour. 

The most popular colour we sell is mist green (80% of our tanks sold) - this is a very durable colour and does not attract excessive heat.

XPRESS tanks have a 10 year warranty.

This is the industry standard warranty for smooth walled tanks.

Smooth walled tanks should not be buried. As with all smooth walled tanks your warranty will be void if you bury the tank and the side wall collapses due to external pressure.

PROMAX corrugated tanks have a 20 year warranty.

PROMAX tanks can be buried up to 1 metre in the ground and still retain their 20 year warranty.

Speak to one of  our salespeople, so we can recommend the best option. 

Yes we have a wide range of tank fittings available.

See the Rain Harvesting and Accessories section.

All Big Tanks (10,000 lt and over) are delivered FREE to your property.

Please note - this may exclude some remote areas and outer islands (eg: Waiheke).

Drivers allow half an hour on your property to deliver the tank - if you require the driver to spend more than half an hour at your property delivering your tank, an additional charge will be applicable.

We recommend contacting your plumber - he can advise on planning the project and ensuring your plans will work.

Click here to download Promax Big Tank Installation Guide PDF.

Click here to download Underground Tank and Septic Tank Installation Guide PDF

If you would like to install the tank yourself this video will be very helpful:

Click here to learn how to purchase Promax product online.