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What size rain water tank do I need?

Author

Ava White

Updated on February 23, 2026

What size rain water tank do I need?

As a general rule of thumb, each square metre of roof space collects around 1 litre of water for every 1 millimetre of rainfall received. Using the calculation of (x) square metres of roof space available for connection to your tank multiplied by the amount of rainfall will help guide your decision.

Also question is, how big of a rainwater tank do I need?

As a general rule of thumb, each square metre of roof space collects around 1 litre of water for every 1 millimetre of rainfall received. Using the calculation of (x) square metres of roof space available for connection to your tank multiplied by the amount of rainfall will help guide your decision.

Likewise, how much rainwater do I need to collect? Approximately 550 gallons of rainwater can be collected for every 1000 square feet of collection surface per inch of rain. To estimate amount collected in one year, take the square footage of your collection surface, divide by 1000, multiply by 550 and then multiply by the average annual rainfall for your area.

Also to know, how do I calculate the size of my water tank?

To determine the volume of a rectangular tank, multiply the length (l) times the width (w) times the height (h). The width is the horizontal distance from side to side. The length is the longest dimension, and the height is the vertical length from top to bottom. Calculate the filled volume.

What size water tank do I need for a 3 bedroom house?

1-2 people need a 30-gallon water heater. 2-3 people need a 40-gallon water heater. 3-4 people need a 40-50 gallon water heater. 5 or more people need a 50-80 gallon water heater.

Is a rainwater tank worth it?

Long term savings

A properly looked after and maintained rainwater tank can last upward of 20 years - in fact some of the first squatter tanks we installed are still standing to this day - and over that time can provide significant savings on your water bills.

Which Colour is best for water tank?

While polyethylene can keep heat out, darker colours like black or dark blue will heat up the water. So if you are using the water straight from the tank, or want it to be cool or room temperature, it is recommended to choose lighter colours.

How big is a 20000 Litre water tank?

Tankmasta
Capacity20,000LT
Dimensions (mm)3580 D x 2470 H
Inlet Height (mm)2300mm
Supplied AccessoriesInlet Strainer at 12 o 'clock, 100mm Overflow at 12 o 'clock
Fittings1 x 40mm brass outlet

How big is a 5000 Litre water tank?

Range & Specifications
Code No:Capacity (LITRES)Diameter (mm)
CCWS-250.0125001500
CCWS-300.0130001500
CCWS-500.0150002000
CCWS-500.0250001800

What is the best base for a water tank?

Types of Water Tank Bases:
  • Sand: Sand is cheap but it has its challenges. If not supported correctly, it can run away very quickly during a storm or heavy rain.
  • Pea Gravel: A solid option.
  • Concrete: Is more expensive but will last the longest if constructed correctly.
  • Dirt/Clay: This is similar to using sand.

Is a bigger pressure tank better?

When it comes to pressure tanks, bigger is almost always better. The bigger the tank you have the larger the drawdown (actual amount of water stored) you will have. A larger drawdown means longer run time and therefore less cycles.

Which water storage tank is best?

Our Solutions
  • Sintex loft water tanks.
  • Reno water tanks.
  • RENO G WATER TANKS.
  • Reno coloured overhead water tanks.
  • Sintex underground water tanks (SUMPS)
  • Sintex underground water tanks (FRP)
  • SMC PANEL WATER TANKS.
  • TITUS Water Tank.

How do I know what size pressure tank I need?

General Rule of Thumb for Sizing a Pressure Tank

Generally, as a rule of thumb, one can follow these guidelines when sizing a pressure tank: 0-10 GPM: 1 gallon of drawdown per 1 GPM of flow. 10-20 GPM: 1.5 gallons of drawdown per 1 GPM of flow. 20 GPM+: 2 gallons of drawdown per 1 GPM of flow.

How much water should be in a water tank?

Multiply the number of cubic feet by 7.47 gallons to determine the number of gallons each container can hold. In the rectangular container example above with a volume of 8 cubic feet, 8 x 7.47 = 59.76 gallons. The volume in gallons of the round container is 56.66 x 7.47 = 423.25 gallons.

What is the average size water heater?

Household size plays a big role in determining the right water heater size. A home with two or fewer people can be served by a 23- to 36-gallon tank. A tank size of 36- to 46-gallons is best for homes of up to four people. A home with five people can be served by a 46- to 56-gallon tank.

Why is rainwater illegal?

Most states allow people to harvest rainwater on their residential and/or commercial properties for non-drinking purposes, such as watering the lawn. But for your safety, there may be strict rules against harvesting water for drinking, as rainwater can contain harmful substances, such as animal feces, E.

What is the best way to collect rainwater?

6 Ways to Collect Rainwater
  1. Barrel Systems / Cisterns. An average sized rain barrel holds 50 gallons.
  2. DIY Rain Barrel. As long as it's waterproof and can hold liquid, you can make a rain barrel out of anything.
  3. Readymade Barrels.
  4. Larger Catchment Systems.
  5. Living or Green Roof.

Can you drink rain water?

Thus, it's not advisable to start collecting and drinking rainwater unless you're 100% certain it's clean and safe for human consumption. Although clean rainwater is safe to drink, it can easily become contaminated as it falls, which could pose a significant health hazard.

How do you store rainwater long term?

5 Ways to Properly Store and Keep Your Rainwater Clean
  1. Install a filter. Filters are essential and can be installed at various points in your rainwater collection system.
  2. Empty barrels once a week and clean them.
  3. Use oil to prevent mosquitoes.
  4. Add chlorine/iodine tablets.
  5. Paint barrels.

How fast do rain barrels fill up?

How quickly will my Rain Barrel fill up? Pretty darn quick! A half inch of rain collected from just a 200 sq. ft.

How long can you store rainwater for drinking?

between one week and indefinitely

How do you calculate rainwater harvesting tank size?

This capacity can be calculated using the following formula: Annual rainfall (in millimetres) x Roof surface area (in square metres) = Roof catchment capacity. This is an important figure to understand so you can design a Rain Harvesting system and choose a tank size that will meet your water volume requirements.

How do you store rainwater at home?

The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire household demand.

How much does rainwater harvesting cost?

The Real Cost of Rainwater Harvesting System Components:
Item*Est. Cost
Tank/Base:$400 - $3,300
Screens at the end of overflow pipes (optional):$16 each
Tank top up system (optional):$100
Pump (optional):$150 - $250

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