Rainwater Harvesting Systems · Best Rainwater Harvesting Systems for 100+ gallons
10 Best Rainwater Harvesting Systems for 100+ gallons (2026)
We evaluated every model against our criteria. 10 earned a spot. Here's what each is best for — and when a different option wins.
✨ Searching for deals...
Top 3 at a glance
Top 3 at a glance
1
Best OverallAquabarrel
EarthMinded for 2x3
Best for: garden / vegetable bed irrigation with 50–65 gallons
100% match
Check today’s price →Why this pick
Single barrels typically hold 45–65 gallons. The Aquabarrel - Aquabarrel leads because it delivers garden / vegetable bed irrigation with 50–65 gallons — exactly what this ranking prioritizes. FlexiFit universal diverter for 2x3 and 3x4 downspouts.
2
Runner-UpAquabarrel
EarthMinded for 2x3
Best for: garden / vegetable bed irrigation with under 50 gallons
100% match
Check today’s price →Why this pick
The Aquabarrel DIY Rain takes a different approach: under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). EarthMinded diverter-only part for 2x3, 3x4, and round downspouts.
3
Also GreatAquabarrel
EarthMinded for 2x3
Best for: garden / vegetable bed irrigation with under 50 gallons
100% match
Check today’s price →Why this pick
The Aquabarrel DIY Rain takes a different approach: under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). EarthMinded 2x3 diverter with winter cover plate.
4
#4 PickFCMP Outdoor
FCMP Outdoor Raincatcher 4000
Best for: garden / vegetable bed irrigation with 50–65 gallons
100% match
Check today’s price →Why this pick
The FCMP Outdoor Outdoor Raincatcher differentiates with top-fill barrel (diverter kits avoid permanently modifying your downspout. top-fill barrels go directly under the downspout). Gold-standard Raincatcher 4000 with flat-back design, aluminum mesh screen, linking kit, and overflow protection.
5
#5 PickOatey
Oatey Mystic
Best for: garden / vegetable bed irrigation with under 50 gallons
100% match
Check today’s price →Why this pick
The Oatey Mystic Rainwater differentiates with under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). Oatey Mystic diverter for 2x3 downspouts.
6
#6 Pickmumisuto
Rain & 50cm
Best for: garden / vegetable bed irrigation with under 50 gallons
100% match
Check today’s price →Why this pick
The mumisuto Barrel Diverter differentiates with under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). Speedy rain collector diverter kit with crown auger, 50cm hose, and tank connection seal.
7
#7 PickRTS Home Accents
RTS Home Accents 50-Gallon
Best for: garden / vegetable bed irrigation with 50–65 gallons
100% match
Check today’s price →Why this pick
The RTS Home Accents Home Accents differentiates with top-fill barrel (diverter kits avoid permanently modifying your downspout. top-fill barrels go directly under the downspout). RTS 50-gallon barrel with stand included.
8
#8 PickRTS Home Accents
RTS Home Accents Polyethylene 50 Gallon Flat Back Dual Brass Spigot Rain Barrel, Woodgrain with Black Stripes Color
Best for: garden / vegetable bed irrigation with 50–65 gallons
100% match
Check today’s price →Why this pick
The RTS Home Accents Home Accents differentiates with top-fill barrel (diverter kits avoid permanently modifying your downspout. top-fill barrels go directly under the downspout). 50-gallon flat-back rain barrel with premium brass spigot and wood-grain finish.
9
#9 PickAquabarrel - EarthMinded
Aquabarrel - EarthMinded Rain Water Diverter DIY Kit for Round Downspouts
Best for: garden / vegetable bed irrigation with under 50 gallons
67% match
Check today’s price →Why this pick
The Aquabarrel - EarthMinded - EarthMinded differentiates with under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). Aquabarrel DIY diverter kit for round downspouts.
10
#10 PickAquabarrel
EarthMinded - Aquabarrel DIY, FlexiFit RainBarrel Diverter Kit for 3 and 4 inch Round Downspouts - Connects Your Rain Barrel to The Downspout
Best for: garden / vegetable bed irrigation with under 50 gallons
67% match
Check today’s price →Why this pick
The Aquabarrel - Aquabarrel differentiates with under 50 gallons (a 1,000 sq ft roof collects ~620 gallons per inch of rain. a 50-gallon barrel suits small gardens). EarthMinded diverter kit for 3x4 downspouts.
Not sure this is your top priority?
Take our 60-second quiz and we'll rank all rainwater harvesting systems based on YOUR specific needs.
Take the full quizMore rainwater harvesting systems roundups
Best Rainwater Harvesting Systems for 50–65 gallonsBest Rainwater Harvesting Systems for 65–100 gallonsBest Rainwater Harvesting Systems for BudgetBest Rainwater Harvesting Systems for Complete systemBest Rainwater Harvesting Systems for Diverter kitBest Rainwater Harvesting Systems for DIY / convert my own container
As an Amazon Associate, Decision Widget earns from qualifying purchases. Product prices and availability are subject to change.