100-Gallon Rain Barrel
The 100-Gallon Rain Barrel provides 100 gallons of rainwater storage in a plastic (hdpe) container measuring 30" diameter x 38" tall. Priced between $80 and $180 ($0.80-$1.80 per gallon of capacity), this tank is an affordable entry point for homeowners new to rainwater harvesting.
About the 100-Gallon Rain Barrel
A step up from the standard 55-gallon barrel, the 100-gallon rain barrel nearly doubles your storage capacity without taking up much more space. These barrels are ideal for homeowners with moderate garden watering needs or those who want fewer refill cycles between rain events. The larger volume means you can water a 200-square-foot garden plot for roughly a week during dry spells. Installation is identical to smaller barrels — position under a downspout on a stable, level surface. Some models feature a flat-back design that sits flush against a wall, maximizing yard space. Consider adding a mesh screen to the inlet to filter debris and prevent mosquito breeding.
Installation Guide
Installing a 100-Gallon Rain Barrel is a straightforward DIY project that most homeowners can complete in under an hour. Position the barrel on a level, stable surface near a gutter downspout. A raised platform (concrete blocks, a purpose-built stand, or a wooden platform) elevates the barrel and improves water pressure at the spigot — every foot of elevation adds about 0.43 PSI of pressure.
Cut your downspout to the height of the barrel inlet and attach a downspout diverter or flex-elbow to direct water into the barrel. Ensure the overflow fitting is connected and directed away from your foundation. Install a mesh screen over the inlet to keep debris and mosquitoes out. In cold climates, disconnect and drain the barrel before the first hard freeze to prevent cracking.
Tools and Materials Needed
- Hacksaw or reciprocating saw for cutting the downspout
- Downspout diverter kit or flex-elbow connector
- Level surface or platform (concrete blocks, paver stones)
- Garden hose for the spigot connection
- Overflow hose or PVC fitting directed away from foundation
- Mosquito-proof mesh screen for the inlet
Best Uses for the 100-Gallon Rain Barrel
The 100-Gallon Rain Barrel is ideal for container garden watering, potted plants, flower beds, car washing, and general outdoor cleaning. Its compact size makes it perfect for urban and suburban homes with limited yard space. You can connect multiple barrels in series for increased capacity without the cost and complexity of a dedicated tank system. Most homeowners place them near their primary garden area for convenient access.