Norwesco 100 Gallon Doorway Water Storage Tank with Slimline Design in Black

The Norwesco 100 Gallon Doorway Water Storage Tank is built to fit where standard round tanks can't. Its slimline doorway profile measures 22 inches wide by 38 inches long, standing 45 inches tall, so it tucks against a wall in tight utility rooms, garages, basements, and equipment closets. Molded in black polyethylene, it stores 100 gallons of water on a footprint of just 22.0 x 38.0 inches. Full of water it carries roughly 834 pounds, and because the shell is rated to a 1.5 specific gravity it can hold contents up to 1,251 pounds.

Will this Norwesco doorway tank fit and work for my space?

Run two quick checks before you buy. First, the 22-inch width is the narrow dimension to compare against your door opening and wall run — it's the whole reason this tank exists, slipping through slim passages where a round 100-gallon tank simply won't go. Second, the 45-inch height clears a standard interior door, so it stands where you need it. Use it for hauled-water storage, rainwater holding, or a water reserve in a constrained envelope. The black color blocks light and helps suppress algae in stored water, which makes it a practical pick for longer-term holding. Run your gallon target through our Tank Sizing Calculator, and if you're comparing this 100-gallon entry against bigger doorway units, the Norwesco Doorway Tank Sizing Guide: 100 to 1000 Gallon by Application maps the full range so you can size up without losing the slim footprint.

Weight, base support, and the mistake to avoid

The number people overlook is filled weight. At 100 gallons of water this tank sits near 834 pounds, and the 1.5 specific gravity rating means the shell has real headroom — it can carry contents denser than water, up to 1,251 pounds, so if your use shifts to a heavier liquid within water service the structure has margin. Plan the slab, platform, or floor for that load before you fill it, and keep the base fully and evenly supported across the 22 x 38-inch footprint. A 45-inch-tall, 22-inch-wide tank has a high center of gravity for its base, so it's less forgiving of an uneven or partially supported floor than a low, wide tank — set it on a flat, continuous bearing surface and strap or restrain it against the wall when it stands. That single install detail prevents most field problems.

Sizing and reservoir planning

If this 100-gallon unit is one element of a larger water reserve, our Tank Sizing Guide helps you set total storage targets. For rural and remote fire-protection storage, the Fire-Water Reservoir Tank Design guide covers NFPA 22 sizing discipline and freeze protection for cold-climate service, where compact polyethylene tanks earn their place in the stack. If you're aggregating grey-water, rainwater, or HVAC condensate, the Industrial Water Reuse Tank Topology guide shows how slim storage units fit a quality-banded reuse train.

This water storage tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant — Shawnee, OK; Sheldon, IA; or St. Bonifacius, MN — so Plains and Midwest ZIPs generally see the lowest LTL cost. Get a real number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we'll quote it and help you confirm fit for your doorway, application, and base before you order.