How to choose a marine water tank
- Match the shape to the spot. Trionic bow tanks are molded to sit forward in the hull. Custom Roto-Molding lists its marine water tanks by model number, and one capacity can come in many shapes: its 10 gallon models alone run from ML-1 to MW-490.
- Compare dimensions, not just gallons. Because several models share a capacity, the gallon figure alone will not pick the tank. Check each model's length, width and height against the space you measured, and keep the one that fits with the least wasted room.
- Settle the capacity last. Sizes run from 2 gallons to 375 gallons, with many steps between, such as 16, 32, 50 and 100 gallons. Among the models that fit, take the one that covers your water use between fills.
- Finish the install. Add-on parts are in RV & Marine Tank Accessories, and the wider RV & Marine Tanks range covers fresh water and waste tanks for boats and RVs.
Marine water tank questions
What is the difference between a fresh water tank and a holding tank on a boat? A fresh water tank stores clean water for use on board, while a holding tank collects waste water. The two are sold in separate categories, with waste tanks under marine holding tanks. Trionic tanks are the exception, since they can serve in either role.
Can I use a marine water tank in an RV? Models named Marine & RV Tank are sold for both uses, in sizes such as 4, 14, 36 and 100 gallons. For tanks sold only for RVs, compare RV water tanks, and for RV waste water, RV holding tanks.
Why are there so many tanks with the same capacity? Custom Roto-Molding sells each marine water tank under its own model number, and several models share a size. At 100 gallons, for example, models run from MW-99 to MW-462. Each model is a separate molded tank with its own shape, so choose by the space you measured first, then by gallons.
What is a bow tank? A bow tank is a water tank molded to fit forward in the hull, toward the bow, instead of in a flat, square space. Trionic makes the bow tanks in this category. Measure the forward space at its widest and narrowest points and compare those figures with the tank's dimensions before you order.
