The 150 Gallon Doorway Water Tank (Norwesco part N-45716) is a 150-gallon white polyethylene tank built to fit through a standard doorway. At 18 inches wide, 50 inches long, and 53 inches tall, it clears the kind of openings that stop a full-diameter vertical tank, so you can stage water inside a basement, utility room, greenhouse, or outbuilding without pulling a door frame. The footprint is just 18.0 x 50.0 inches, keeping it tight against a wall while still holding a useful volume.
Will it work for your job
The number that sets this tank apart is its specific-gravity rating of 1.5. That means it is built to carry contents up to specific gravity 1.5 - roughly 1,876 pounds of contents - versus about 1,251 pounds when filled with plain water (specific gravity 1.0). That is around 625 pounds of extra rated payload over a water-only shell. Plan your floor, pad, or platform around the loaded weight, not the empty tank. Across the 18 x 50 inch footprint (900 square inches), a full water load works out to roughly 1.4 psi (about 200 pounds per square foot), and more at the 1.5 rating - check that against any wood floor or light pad before you site it. If you are not sure whether 150 gallons matches your draw-down or refill cycle, run the numbers with our Tank Sizing Calculator and the Tank Sizing Guide first.
How it ships
This doorway tank ships LTL freight, quoted live to your ZIP code. It is fulfilled from the nearest Norwesco plant among Hanford, CA; Tooele, UT; and Washougal, WA - all West and Mountain locations, which keeps transit short for buyers in those regions. If you are in the East or Midwest, note there is no eastern plant for this SKU, so expect longer LTL transit and higher freight; pull an exact number with the Freight Cost Estimator before you commit, or call us at 866-418-1777 and we will quote it for you.
The mistake to avoid
Doorway tanks are bought for their slim width, so the common error is ordering on assumptions instead of measuring. Confirm the 18-inch width and 50-inch length against your actual door opening, hallway turns, and the path to the install spot before delivery. The second issue is stability: at 53 inches tall on an 18-inch narrow side, this tank runs roughly a 2.9-to-1 height-to-width ratio, so it must be strapped or restrained once filled, not just set in place. And keep the 1.5 specific-gravity rating in perspective - it tells you the tank handles heavier-than-water contents, but it does not make this a potable-water or chemical tank on its own. For dimensional layout and fitting locations, see the technical drawing on this page.
For deeper planning, see our guide on fire-water reservoir tank design, the 150 Gallon Doorway Water Tank buyer's guide, and concrete pad sizing for above-ground polyethylene tanks. Ready to move on this Norwesco doorway tank? Pull a live LTL freight quote with the Freight Cost Estimator or call 866-418-1777, and use the Tank Sizing Calculator if you are still settling on capacity.
3 Year Warranty
