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Rain barrels: choose the water path before the barrel shape

By the Plain Prepper editors. Updated 2026-10-15.

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Quick answer

Choose a rain barrel for non-drinking outdoor use, with a stable supported base, protected openings and an overflow route away from the building. Compare the actual outlet arrangement, cleaning access and winter instructions. The examples below are nominal 50-gallon models with different dispensing and overflow designs; none makes roof runoff safe to drink.

Start with the destination for the collected water

A barrel works best when its intended watering area and dispensing method are decided before installation. Filling a watering can near a downspout is a different job from sending water along a hose. Identify where you can safely stand, reach the outlet and empty the container without sending water back toward the house.

For these examples, plan on ornamental plants rather than a household drinking reserve. CDC recommends lower-exposure uses such as watering plants you do not eat. Where possible, use public-system tap water or bottled water for drinking, food preparation and edible plants. Roof runoff can carry germs and chemicals even when it looks clear.

FCMP's manual expressly excludes human and animal consumption. Good Ideas' BPA-free material description does not establish that the collected water is drinkable. Neither a debris screen nor a decorative planter changes those limits.

Check collection and drainage requirements with local agencies before altering the downspout. A retail listing is not evidence that a particular installation is allowed at your address.

Compare outlets, screens and the space needed for care

Model	Listed capacity	Dispensing arrangement	Overflow feature
Good Ideas Rain Wizard 50	50 gallons	One brass spigot	Front-facing overflow
Good Ideas Rain Wizard Urn 50	50 gallons	Two brass spigots at different positions	Channel directing excess water toward the front
FCMP Raincatcher 4000	50 US gallons	Outlet hose with thumb valve	Rear overflow connection with hose routed beneath the barrel

Rain Wizard 50 is listed as 30 inches high, 23 wide and 22 deep. Urn 50 has the same listed outer dimensions, with a self-draining planter top. Raincatcher 4000 is listed as 32 inches high and 24 inches wide and deep. Allow additional working space for hoses, screen removal and access rather than using the body dimensions as the whole installation footprint.

The Urn page describes two spigots and its specification table also says two, but its included-items list uses singular wording. Verify the actual package before purchase. For Rain Wizard 50, the linking kit is separately sold; FCMP lists a linking kit among its included accessories. Do not transfer one package's contents to another.

Treat nominal gallons as a load, not a handling promise

USGS gives approximately 8.34 pounds per US gallon of water. A nominal 50-US-gallon fill therefore represents 50 x 8.34 = 417 pounds of water alone. A nominal 55-US-gallon fill would be about 458.7 pounds. The latter is a sizing comparison, not the capacity of any of the three examples.

Add the barrel, fittings and any planter contents when assessing the supporting surface. Good Ideas lists Rain Wizard 50 at 20 pounds empty and Urn 50 at 17 pounds empty. Those product weights do not include stored water. Plan placement before filling rather than relying on the empty container's apparent portability.

FCMP calls for a flat location and recommends a level base that prevents shifting or tipping. If considering a raised support to improve outlet access, have its stability and suitability for the full load resolved first. This guide does not provide a homemade stand design or a platform load rating.

The current FCMP product and English manual agree on 50 US gallons. The French overflow paragraph in that same manual says 54 US gallons/205 litres. That is a documentation conflict, not permission to overfill or a reason to treat the model as a larger barrel. Confirm any differing label with the maker.

Install for the full-barrel condition and preserve the safety features

A usable overflow route is part of the installation. FCMP directs its overflow hose away from foundations and discusses preventing erosion where water leaves the hose. Good Ideas uses front-facing overflow features. Check where that water actually lands; a forward outlet alone does not establish that the ground carries it safely away.

Raincatcher 4000's instructions call for approximately 2 inches of clearance between downspout and screen so the screen can be removed for cleaning. Measure the final base and barrel together before changing the downspout. This clearance belongs to that installation, not every diverter kit or barrel design.

Follow the chosen model's supplied instructions for connections and any linking arrangement. Adding barrels adds supported water weight and still needs an overflow destination once storage fills. A connector joining containers should not be mistaken for the final drainage route.

Keep children and pets away from stored water. FCMP specifically forbids removing or modifying the sturdy spokes beneath its screen. Preserve the original protective parts and replace damaged components as directed; do not enlarge the opening for easier bucket access. Manufacturer safety language is not a substitute for keeping access controlled.

Keep insects out and distinguish the kinds of diverter

Inspect the inlet protection, openings and overflow route when checking the barrel. CDC advises tightly covered water-storage containers, or appropriately fine mesh where there is no lid. Its mosquito guidance also calls for weekly attention to nearby water-holding items. A screened barrel beside an overlooked saucer or planter is an incomplete maintenance routine.

Remove trapped leaves and debris from the screen and replace damaged protection. Good Ideas' care instructions emphasize checking both barrel and gutter screens. Keep the protective assembly in place during use, rather than leaving it off after cleaning.

A downspout connection, an overflow arrangement and a first-flush diverter serve different purposes. CDC describes first flush as diverting the initial runoff away to reduce incoming contamination. It does not make untreated collected water potable. Keep rainwater separate from drinking-water pipes.

Good Ideas' care page suggests oil or vinegar for particular maintenance problems. Those suggestions are not a complete mosquito-product label or a drinking-water treatment procedure. Prioritize protected openings, drainage and cleaning; obtain local mosquito-control advice if water cannot be covered or emptied. Do not improvise chemical mixtures inside the barrel.

Choose a barrel you can drain, clean and winterize

Good Ideas advises regular draining, with discharge directed away from the foundation, followed by disconnecting, rinsing accumulated sediment and complete drying. It allows dish soap or vinegar for interior cleaning and does not recommend bleach. Follow that product's instructions rather than importing a drinking-water-container bleach recipe.

Before freezing conditions, Good Ideas says to drain and clean the barrel, inspect for damage, leave the spigot open and store it so water cannot collect. It recommends an enclosed storage space in colder climates; outside storage calls for an inverted barrel and open spigot. Reconnected equipment should be drained and disconnected again if a freeze is forecast.

FCMP likewise requires complete drainage of the barrel and hoses in cold climates, hoses stored indoors and the barrel inverted to prevent trapped water freezing. Treat outdoor placement and protection from freezing as separate requirements.

Check seals, outlets, screens and the drainage area when returning the barrel to service. Stop and resolve damaged parts or an unstable base before refilling. The more attractive barrel is not the more useful choice if its screen cannot be removed at the chosen location or its winter drainage job is inaccessible.

What to look for when you buy

Questions people ask

Is a 55-gallon rain barrel much different from a 50-gallon model?

At nominal US-gallon fills, the water alone differs by about 41.7 pounds: 5 x 8.34. Compare the exact barrel's support requirements, openings and outlets, not capacity alone. None of these examples is a 55-gallon model.

Can I drink rain barrel water if the barrel has a screen?

No. A debris screen does not establish removal of germs or chemicals. These examples are for non-drinking outdoor use; FCMP also rules out animal consumption.

Can I turn an unknown used drum into a garden rain barrel?

Do not assume an unknown container's former contents or fittings are suitable. Choose a documented rain-collection product with protected openings and installation instructions, and check local requirements before changing the downspout.

Can these rain barrels stay filled through a freeze?

The opened Good Ideas and FCMP instructions require draining for freezing conditions. Follow their specific hose, spigot and inverted-storage directions rather than treating general outdoor durability claims as freeze protection.

Sources

• Rain Wizard 50 current product, dimensions, capacity and included components, Good Ideas
• Rain Wizard Urn 50 current product, planter, spigot positions and package wording, Good Ideas
• Raincatcher 4000 current product and specifications, FCMP Outdoor / Forest City Models and Patterns
• Raincatcher 4000 maker-linked installation manual, English and French sections, FCMP Outdoor
• Cleaning, Maintaining, and Winterizing Your Rain Barrel, Good Ideas
• Collecting Rainwater and Your Health: An Overview, CDC
• Mosquito Control at Home, storage covers and nearby standing water, CDC
• A Million Gallons of Water, approximate pounds per US gallon, U.S. Geological Survey

Sources checked 2026-10-15.