Ethan BrooksBy Ethan Brooks

Updated November 2026

An outdoor solar shower DIY build uses a black-painted water bag or tank, a sun-facing collector, and gravity or a small pump to deliver warm water to a shower head. In this guide you will size the water container, choose tubing and fittings, mount the unit so it catches the most sun, and add simple controls so the water stays comfortable. The whole project is well within reach of a beginner with basic hand tools.

How a DIY Solar Outdoor Shower Works

Sunlight passes through a transparent or dark-colored surface and heats the water inside a container. Dark surfaces absorb more radiant energy, which is why most homemade units use black vinyl, black-painted metal or a black polyethylene bag. Warm water is less dense than cold water, so it rises to the top of the container and can be drawn off through a hose. Cold water enters from the bottom to replace it.

Shopping for one? See our guide: 6 Best Outdoor Solar Lamp DIY Kits and Parts for 2026.

Two designs cover most builds. A gravity-fed unit hangs the tank above the shower head, so water flows by height alone. A pressurized unit uses a small pump or a pressurized tank so you get a steadier spray. Gravity systems are simpler and have no electrical parts. Pressurized systems need more planning but feel more like a standard shower.

Step 1: Plan the Water Volume and Shower Time

Start by estimating how much water you need per shower. A low-flow shower head typically delivers around 1.5 to 2.0 gallons per minute, so a five-minute shower uses roughly 8 to 10 gallons. Owners of solar showers often plan for one full tank per person per day, with a small reserve for rinsing or cloudy days.

Then size the container. A 20-gallon black bag gives one comfortable shower in most warm-season conditions. Plan a larger tank if you have several users or if you expect cool, cloudy days. Remember that a full 20-gallon bag weighs about 170 pounds, so the mounting point must be rated for that load plus a safety margin.

Checklist: Materials and Tools

  • Black water bag or black-painted tank rated for your water volume
  • Vinyl or PEX tubing, typically 1/2-inch inside diameter for flow
  • Shut-off valve or ball valve at the outlet
  • Shower head with an on/off valve or pull-chain control
  • Hose fittings, clamps and thread sealant (PTFE tape)
  • Mounting frame or sturdy bracket, plus lag screws or U-bolts
  • Drill, adjustable wrench, hacksaw or tubing cutter, and a level
  • Optional: small 12-volt pump with a 12-volt battery and panel for pressurized service

Step 2: Choose the Container and Collector Surface

For a gravity build, a black vinyl bag with a fill port and an outlet fitting is the most common choice. Make sure the bag has UV-stabilized material, since standard plastic becomes brittle in sun within a season or two. Manufacturers of commercial solar camp showers generally specify UV resistance for this reason.

If you prefer to build your own collector, a shallow tray of black-painted sheet metal or a black hose coiled in a clear-covered box also works. Coiled black hose heats water as it flows through, which means the shower head can deliver warmer water without storing a large volume. This is a useful approach for a flow-through design, though the output is limited by how fast water moves through the coil.

Step 3: Position and Mount the Unit

Orientation matters more than most beginners expect. In the Northern Hemisphere, face the collector south. In the Southern Hemisphere, face it north. Tilt the surface toward the sun at roughly your latitude angle for the best year-round exposure, or steeper for winter-heavy use. A tilt of 30 to 45 degrees suits most sites in the continental US.

Mount the bag or tank on a frame at least 6 to 8 feet above the shower head so gravity provides enough pressure. Use lag screws or U-bolts into solid lumber, not into thin siding. Check with a level and make sure the frame does not sway in wind. For more on how solar hardware is oriented and sized, see Solar Panel Specifications for DIY Systems: What Each Number Means.

Sub-steps for a Secure Mount

  1. Build or buy a frame from pressure-treated 2×4 lumber with a diagonal brace.
  2. Anchor the frame to a deck post, wall stud or ground stakes rated for wind loading.
  3. Attach the bag with stainless straps so it cannot slip when full.
  4. Route the outlet hose downward and secure it every 18 inches to prevent kinks.

Step 4: Plumb the Outlet, Valve and Shower Head

Connect the bag outlet to a ball valve, then run tubing to the shower head. Keep the run short and avoid sharp bends, which restrict flow. Use PTFE tape on threaded joints and tighten hose clamps until they sit snug without crushing the tubing. Test for leaks with the bag half full before you fill it completely.

Put a valve near the shower head so you can stop flow without climbing up to the tank. If you plan to use the unit with a pump, install a check valve on the cold-water inlet so warm water cannot flow backward.

Step 5: Control Temperature and Safety

A fully sunlit bag can exceed 110 degrees Fahrenheit on a hot afternoon, which is hot enough to cause burns. Owners commonly add a simple mixing valve or blend cold water from a second, shaded container. A thermometer on the outlet helps you learn how your setup behaves across seasons. Also cover the bag or drain it at night to reduce heat loss and prevent pests from nesting in the water.

If you use an electric pump, keep the battery and wiring away from splashing water and use a fused, weatherproof connection. For battery selection and fusing guidance, see DIY Solar Safety: Wiring, Fuses and Batteries. Consult a licensed electrician if you plan to connect the pump to a home electrical system.

Gravity vs. Pressurized Designs

Feature Gravity-Fed Pressurized (Pump)
Electrical parts None Pump, battery, wiring
Spray pressure Low to moderate Steady and adjustable
Complexity Simple Moderate
Best for Camping, cabins, warm climates Frequent use, multiple users

Common Mistakes

  • Mounting the tank too low, which gives weak flow.
  • Using non-UV-rated plastic, which cracks within a season.
  • Underestimating the weight of a full tank and under-building the frame.
  • Running long tubing with tight bends, which cuts flow dramatically.
  • Skipping a temperature check and getting scalded on a hot day.
  • Leaving the water sitting for days, which encourages algae and bacteria.

Tips for Better Performance

  • Clean the bag and tubing every few weeks and drain it between long gaps.
  • Use a shower head with a built-in shut-off so you conserve water.
  • Fill in the morning and let the sun work all day.
  • Keep a shaded spare container for blending cool water.
  • Coleman Solar Shower Bag: a ready-made black vinyl bag with a built-in hose, useful as a starting container for a gravity build. View on Amazon
  • Camco Olympian Solar Shower: a camp-style unit with a hanging design that suits a simple mounting frame. View on Amazon
  • Brass ball valve with hose barb: lets you shut off flow at the outlet without climbing to the tank. View on Amazon
  • Stainless steel hose clamps: secure tubing connections without corroding outdoors. View on Amazon

FAQ

How long does it take to heat water in an outdoor solar shower?

Heating time depends on sunlight, container color and volume. On a clear, warm day, a dark bag often becomes comfortably warm within a few hours of direct sun. Cloudy or cold days may require a longer exposure or a smaller volume.

How hot does water get in a solar shower?

On hot, sunny days, water can exceed 100 degrees Fahrenheit and occasionally reach temperatures that can scald. Blending with cold water or using a thermometer helps keep the output comfortable.

Can I use an outdoor solar shower in winter?

You can, but output drops sharply in cold weather and short days. Many owners either limit winter use or add a backup heating method.

What size pump do I need for a pressurized build?

Choose a 12-volt pump rated for your desired flow rate and head height, and size the battery and panel to run it for your shower time. Check the pump’s specifications for flow and pressure before buying.

Is it safe to drink or use the water for cooking?

No. Water stored in a bag or tank outdoors is intended for showering or rinsing only. It can carry bacteria and algae, so do not drink it unless it has been properly treated.

How often should I clean the system?

Clean the bag and tubing every few weeks, or after any long period of disuse. Drain the container when you leave for extended periods to prevent stagnant water buildup.

Do I need a permit to install one?

Requirements vary by location. Simple gravity units on a deck or camp site rarely need permits, but plumbing or electrical additions to a home may. Check with your local building department before connecting to household plumbing.

Conclusion

A well-built outdoor solar shower DIY project gives you warm water with no fuel and minimal upkeep. Size the container for your daily use, mount it high and facing the sun, and add a valve and temperature check for comfort. Start with a simple gravity design, then add a pump only if you need steadier pressure.

Ready to choose one?

Ethan Brooks

About Ethan Brooks

Ethan Brooks is part of our editorial team and reviews and edits our DIY solar power systems guides, checking product details against manufacturer specifications and owner feedback.