The 5 Best 21 Gallon Water Tanks (2023 reviews)

We know from years of feedback from readers, customers and amazon sellers, what most people want in a tank. The a.a 21 gallon water tank is exactly that - it's a simple tank that hits all the right notes. These rotational molded fresh water tanks are made from a high quality durable polyethylene material. It comes with (1) 1.25" water fill inlet and (3) 3/8" npt connections. Stain, corrosion and rust resistant features make them ideal for replacement or OEM installation on RVs, horse trailers or marine products. The tank must be vented or vented.

Why We Like This:

Good investment for long term
Good brand reputation

Best Runner up: Recpro 21 Gallon Water Tank

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Not everyone likes to purchase tank for their daily usage, but the recpro 21 gallon water tank would be an anomoly. The water tank of your RV is the lifeblood of all water sources throughout your rig. This 39 x 16 x 8 tank is constructed using strong high. It’s a material that carries FDA approval.

Why We Like This:

Good investment for long term
Good brand reputation

Best With Trailer: Class A Customs 21 Gallon Water Tank

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The tank looks like it made of pretty tough stuff. It fits perfectly in the space between the fuel tank and side frame rail on. It is made in a warehouse to clean each tank prior to use to remove any debris, scuffs or marking from the manufacturing process. It is incredibly easy with some plus nuts, a bit of welding and some metal. It is recommended to use a fill dish or other gravity process.

The tank must be vented allowing air in and out during use. There are Pre-threaded spots you can puncture out on both ends top and bottom to use as you see fit, but no fittings with it. The sizing of the tank fits perfectly on the 2019 ford transit, so you can’t even see the tank unless you crawl down under.

Why We Like This:

Perfect for front of 1966 airstream tradewind
Great quality, super easy to install
Good investment for long term

Best For Well: classacustoms 21 Gallon Water Tank

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If you want nothing but the best desirable tank, then classacustoms 21 gallon water tank is the one you should definitely consider. The tank and fittings are both made out of this material. It is made with nsf international nsfansi std 61 approved medium density polyethylene (mdpe) resin with uv-8 stabilization. It works well for great quality and also it is easy to install and value for the money.

The fittings are included so that you save time and energy trying to get the correct ones. The tank must be vented allowing air in and out when in use. These have a certified technician install all parts to prevent product damage and personal injury. It is made in a warehouse, wipe with a damp cloth to remove surface dust or scuffs.

Why We Like This:

Sanitize each tank prior to use to remove any debris from the manufacturing process
Resistant to stain, corrosion and rust resistant
Seamless one piece construction, no seams to burst

Best For concession Trailer: Toughgrade 21 Gallon Water Tank

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate tank. The toughgrade 21 gallon water tank is exactly that - it's a simple tank that hits all the right notes.

Why We Like This: