The Norwesco 400 Gallon Green Doorway Water Tank is built to pass through a standard doorway and stand upright in basements, utility rooms, and tight equipment pads where a full-diameter vertical tank will never fit. At 29 inches wide, 66 inches long, and 70 inches tall, its slim 29.0 x 66.0-inch footprint is the entire point of the doorway profile: get 400 gallons of usable storage into a room you can actually reach through a normal door. The green polyethylene body keeps light out to slow algae and biological growth, which makes it a practical pick for stored fresh water, rainwater capture, and fire-reserve duty. If you are searching for a Norwesco doorway tank in the 400 gallon class, this is the water version of that profile.
Will it work for my install?
This is a 400-gallon doorway tank rated to a specific gravity of 1.1, which covers water and most water-based contents up to that density. Size your structure around weight, not just volume: 400 gallons of water alone runs about 3,336 pounds full, and the tank is rated to a maximum contents weight of 3,670 pounds. A loaded tank this size needs a level, continuously supported pad or floor that can carry that load across the 29 x 66-inch footprint. The 70-inch height clears most basement ceilings while keeping the center of gravity reasonable over the narrow base. On fittings: the inlet, outlet, and lid sizes and locations are shown on the technical drawing on this page, so confirm them before you plumb a fill line or a draw to a pump, and budget bulkhead fittings and gaskets separately if they are not molded in. If you are weighing this against the 300-gallon doorway tank or sizing for a specific draw-down, run the numbers with our Tank Sizing Calculator and the Tank Sizing Guide.
Will it fit through your door?
The 29-inch width is the whole reason this tank exists, so turn it into a hard go/no-go check before you order. A standard 32-inch door gives you roughly 30 inches of clear opening; at 29 inches wide this tank clears it with about an inch to spare. Measure your narrowest doorway, stair turn, and hallway, not just the front door, because an empty doorway tank is still a large object to maneuver onto a pad. Check the empty handling weight on the technical drawing on this page to plan whether one or two people move it into place before filling.
How does it ship?
This Norwesco tank ships LTL freight from the nearer of two plants, Hanford, CA or Washougal, WA, with the mode quoted live to your ZIP. Doorway tanks ride well on a pallet thanks to their compact footprint, but they are still oversized freight, so the carrier and accessorials depend on your delivery point and whether you need a liftgate or limited-access service. Get an exact number before you order with the Freight Cost Estimator, or call 866-418-1777 and we will quote it for you.
The mistake to avoid
The most common error with a doorway tank is buying on volume and ignoring the 1.1 specific gravity ceiling. This tank is sized for water-density and near-water-density contents; do not assume it handles heavier brines or chemical solutions above 1.1 SG. Storing something denser than 1.1 SG, such as a brine or a heavy fertilizer? Step up to a tank rated 1.5 SG or higher, and call 866-418-1777 so we can match you to the right resin and rating instead of overloading this one. For fresh-water and fire-reserve use it is a strong fit, and the green resin slows the biological growth that plagues clear and translucent tanks.
For a full walkthrough of this tank, see our 400 Gallon Green Doorway Water Tank buyer's guide, or step down a size with the 300 Gallon Green Doorway Water Tank guide. Planning fire-reserve storage? Our guide to rural and remote fire-water reservoir design covers NFPA 22 sizing discipline and freeze protection. Ready to order? Get your live LTL freight quote with the Freight Cost Estimator or call 866-418-1777.
3 Year Warranty
