Under Deck Water Tanks

Underdeck Tanks | Under Deck Rainwater Tanks | Water Tanks Under Deck

Thousands Of Different Sizes Available. Delivered To Your Door. All Underdeck Tanks Come With Extended Warranty & Are Fire Resistant. Find Out More Today.

Under Deck Water Tanks

Many people ask the question: Can we fit a metal water tank under the confined spaces of a deck or under any other structure? The answer is yes because at Select Water Tanks we can build your tank to fit most circumstances.

Under Deck Water Tanks
Under Deck Water Tanks

Underdeck tanks can be joined together for greater holding capacity of rainwater storage.

Under deck water tanks are great for when you have limited space and also when you wish to locate your tank(s) in a place that doesn’t take up valuable yard or garden space.

Slimline Water Tanks are the best to use under a deck because they can be built to fit between the support posts and bearers. You can see from the diagram Slimline Water Tanks can be built to be a minimum of 300mm high, 550mm wide and 1000mm long.

For example, if your deck is one metre off the ground and the main support posts are one metre apart, then we can build the Slimline Water Tank to be under one metre high and under one metre wide so it can fit under the deck and between the support posts and bearers.

If the support posts are in a line, then the Slimline Water Tank can be built to be anything from 1000mm to 4000mms in length.

If you wish to create as much water capacity as you can, then you could install more than one Slimline Water Tank under your deck and have the tanks linked up to work as one (See Images above).

Slimline Water Tank Example Dimensions

Slimline Water Tanks

Please note: not all dimension combinations are available

Lisa Hagean

Select Water Tanks Google Review Lisa Hagean 

"I recently ordered a 7500 litre stainless steel round tank from Select Water Tanks and couldn't be happier with it. The process from order to delivery was perfect and I was kept in the loop with manufacture times and a set delivery date. Communication was great through the process and I had to change the delivery date to suit me and there was no issue with this.."

Gary Turner

Select Water Tanks Google Review Gary Turner 

"A big thank you to Jason, Linda, Loyd, Damon and the team at Select Watertanks.The whole process ran on time, in fact you were able to deliver all our tanks prior to Christmas.The boys did a great job negotiating our tricky block and setting up the tanks.We highly recommend Select Watertanks"

Paul Inglis


"The team from Select Water Tanks were superb. The way they handled my new tank was especially careful and thorough. It was great watch them take it down a hill and locate on the site. Highly recommended for good product, service and interest in the customers needs."

Barbara Geitz

Select Water Tanks Google Review Barbra Geitz 

"We have just bought 3 tanks and have now installed them. We found Select Tanks very easy to work with right through to delivery. We had to change the delivery date on a number of occasions and it was never a problem. We are very happy with the quality of the tanks which look great."

Under Deck Water Tanks: Options

You can decide to have the Slimline Water tanks made from Aquaplate/Colorbond or from Premium Grade Stainless Steel (304 Grade) or from Marine Grade Stainless Steel (316 Grade).

If you choose to have your tank(s) made from Aquaplate/Colobond, then you have a range of colours to choose from.

When you order your Slimline Water Tank from Select Water Tanks, we will provide you with the opportunity to say where you want the Inlet, Outlet and Overflow fittings to be placed so that they best suit your site requirements.

The standard fittings [400mm inlet strainer and light guard, 25mm outlet and ball valve, and the overflow with stainless steel gauze screen], are provided with your tank so that there is minimal chance of mosquitos, other small insects or animals being able to get into the tank. Additional fittings can be added to your tank[s] as required

Under Water Tanks - 316 Grade Steel

Stainless Steel 316 Marine Grade

Under Deck Water Tanks 304 Grade Steel

Stainless Steel 304 Grade

 Colorbond Under Deck Water Tanks

Colorbond / Aquaplate Steel

Under Deck Water Tank Price Lists

For a full list and breakdown on pricing for all  Our Underdeck Water Tanks, Filtration Systems & Accessories.
Please click below or contact us.

More Than Just a Manufacturer of Steel Rainwater Tanks

Select Water Tanks custom make round & slimline water tanks that are longer lasting, better looking, healthier, & better for the environment. They can be made from either grade 304, marine grade 316 stainless steel or colorbond steel.

Tailored Solutions

We find the perfect solution for your rainwater harvesting system needs.

Quality Guaranteed

Highest quality Stainless steel water tanks backed by 30 years non corrosion warranty. Our Colorbond Tanks are backed by 20-years non corrosion warranty.

Industry Leading

We are the first Australian company to design and manufacture stainless steel water tanks.

Looking for Help or Advice?

If you need any help with Steel Water Tank Pricing, Custom Sizing, Delivery Charges or anything else
Please contact us today – we are here to help.