If you’re new to vintage RVs or just looking to maintain your fresh water system, you’ve come to the right place. In this article, we’ll break down the basics of vintage RV water systems, show you how to sanitize your tank, and explain the importance of using a water regulator.
Pressurized vs. Demand Water Systems
Vintage RVs often featured pressurized water systems, which relied on air pressure to push water through the lines. These systems used metal tanks (usually steel or aluminum) and required either an interior air compressor or an external air fitting to pressurize the system. Over time, these tanks could become unsanitary or deteriorate, with linings breaking down.
Modern RVs use demand water systems, which are more efficient and easier to maintain. These systems feature lightweight plastic tanks paired with 12-volt pumps that pull water from the tank and distribute it through the lines. They’re simpler, safer, and easier to sanitize compared to their vintage counterparts.
Sanitizing Your Fresh Water System
Regardless of your RV’s water system, annual sanitization is essential for safe and clean water. Here’s how to sanitize your fresh water tank:
Step 1: Calculate Tank Capacity
If your tank’s capacity isn’t labeled, use this formula:
Length × Width × Height ÷ 231 = Gallons of Tank Capacity
Step 2: Sanitize the Tank
- Measure Bleach: Multiply your tank capacity (in gallons) by 0.13 to determine the ounces of bleach needed.
- Mix Solution: Combine the bleach with one gallon of water.
- Fill the Tank: Pour the solution into the tank and fill it completely with water.
- Run Faucets: Open all faucets until you can smell the bleach in the water.
- Wait: Let the solution sit in the system for at least 4 hours.
- Neutralize and Rinse: Drain the tank, refill it with fresh water, and add ¼ cup of white vinegar. Drain again to neutralize the bleach smell.
Tip: Always fill your system using a non-toxic, marine-grade hose (usually white). Standard garden hoses can leave an unpleasant taste and may introduce contaminants.
The Importance of a Water Regulator
If you hook up your RV to city water, you’ll bypass the tank, delivering water directly to your faucets and toilet (if equipped). However, many RV systems can’t handle pressures above 50 PSI. Excessive water pressure—often over 100 PSI in some parks—can damage your RV’s lines and fixtures, causing leaks and expensive repairs.
Protect your system by using a water pressure regulator on the exterior faucet. These small, affordable devices (around $15) prevent high-pressure damage. Pair it with a marine-grade hose to ensure a safe and clean water supply.
Maintaining your vintage RV’s fresh water system doesn’t have to be intimidating. With proper care and the right tools, you can keep your system running smoothly, ensuring fresh, clean water on every adventure.
