Choosing the right waste water tank is essential for comfortable, hygienic, and compliant RV living. This guide highlights practical options from Ameri-Kart and Class A Customs, focusing on durability, installation flexibility, and capacity. Whether you’re upgrading an existing system or outfitting a new motorhome, these selections cover common sizes and configurations to fit most motorhomes, campers, and trailers.
Summary of selected products:
- Ameri-Kart 30 Gallon RV Black Water Tank (HT-140) — 30 gallons, end discharge, side installation options
- Ameri-Kart 34 Gallon RV Black Water Tank (HT-516) — 34 gallons, left side discharge, robust build
- Class A Customs 27 Gallon RV Waste Black Water Holding Tank WT-2700 — 27 gallons, MDPE resin, 3″ outlet
- classAcustoms WT-1653 16 Gallon Black Water RV Waste Holding Tank — 16 gallons, compact for smaller spaces
- Class A Customs 14 Gallon RV Waste Black Water Holding Tank WT-1400 — 14 gallons, lighter duty option
Ameri-Kart 30 Gallon Black Water Tank
Capacity and purpose are aligned in this 30-gallon waste water tank designed for toilets, sinks, and showers in motorhomes and trailers. It is made in the USA from MDPE or similar weather- and impact-resistant plastics, ensuring durable seasonal use. The tank features a 3″ end discharge outlet, with install options determined by user preference. Sensor probes indicate water levels, aiding maintenance planning. It is intended for waste/gray water use and meets typical IAPMO standards for RV waste handling.
Ameri-Kart 34 Gallon Black Water Tank
This 34-gallon waste holding tank expands capacity for smaller or mid-sized motorhomes. It uses weather- and impact-resistant plastics to resist corrosion and wear. The unit includes a 3″ end discharge outlet with flexible installation options to suit various RV layouts. Sensor probes for high/low water levels assist with monitoring. As with other Ameri-Kart tanks, it is designed for waste/gray water use and is built to IAPMO standards for reliability during long trips.
Class A Customs 27 Gallon Black Water Tank WT-2700
Designed specifically for waste and gray water, this 27-gallon tank is manufactured in the USA with medium density polyethylene. It uses a 3” ABS outlet, with inlet and vent locations customizable by the installer. The tank is vented to allow air flow during use and should not be pressurized. Build quality emphasizes leak resistance and durability for RVs, campers, and tiny homes. Note that hardware is not included for installation, so compatible mounting and fittings are required.
classAcustoms WT-1653 16 Gallon Black Water Tank
Compact 16-gallon option for RVs, campers, and tiny houses, built from MDPE resin in the USA. It is explicitly for waste/gray water use, with a 3” ABS outlet, and vent/inlet placement determined by the user during installation. Like larger models, it emphasizes leak resistance and long service life, with installation hardware not included. This size suits smaller spaces or as a supplementary holding tank in larger rigs.
Class A Customs 14 Gallon Black Water Tank WT-1400
This 14-gallon holding tank offers a lightweight option for smaller RVs or partial upgrades. It uses MDPE resin for strength and durability, with a 3” ABS outlet. Inlet and vent installation are user-determined, and the design requires venting to avoid pressure buildup. As with other Class A Customs tanks, it’s intended for waste/gray water only, not for drinking water, and installation hardware is not included.
Buying Guide
Key purchase considerations for motorhome waste water tanks include capacity, discharge configuration, material, and installation needs. Consider the following perspectives to ensure a well-suited choice for your RV lifestyle.
- Capacity versus space: Larger tanks offer extended hold times between dumps but require more space and mounting clearance. Smaller tanks fit compact RVs but may require more frequent emptying.
- Discharge outlet placement: End discharge versus side discharge affects how and where you mount the tank within the vehicle. Confirm compatibility with your existing plumbing and chassis.
- Material and durability: MDPE and similar plastics provide impact resistance and durability under outdoor conditions. Weather resistance reduces long-term wear from temperature fluctuations and road use.
- Ventilation and installation: Proper venting prevents air pressure buildup and ensures smooth operation. Inlet and vent locations are often installer-determined; plan for accessible access and seal integrity.
- Sensor features: High/low water probes help monitor tank levels. This reduces the risk of overflows and enhances maintenance planning during trips.
- Compatibility with waste types: Ensure the tank is designated for black water (toilet waste) or gray water (sinks/showers), as some tanks are explicitly for one type only.
- Standards and reliability: Look for IAPMO or equivalent certifications and USA-made construction for consistent quality and safety.
When selecting a tank, assess your RV’s floor plan, access points, and existing drain plumbing. Matching the discharge size and inlet/vent locations to your rig minimizes retrofit work. If possible, consult a professional installer to confirm compatibility with your wastewater system and to ensure proper sealing and venting to prevent leaks or odors.