Danner Cronise — "We Finally Have RUNNING WATER at the Shed Tiny House!" (Aug 10, 2025) · The build this guide is based on.
System Architecture
How the System Works
An IBC tote water system is elegant in its simplicity: a large-volume storage tank (the IBC) feeds a small 12V demand pump by gravity, the pump pressurizes the water to 40–50 PSI, an accumulator tank smooths the flow, and PEX or flexible tubing carries pressurized water to every fixture in the house. The entire system runs on a 100W solar panel and a single deep-cycle battery.
| Stage | Component | Function | Key Spec |
|---|---|---|---|
| Storage | IBC tote (275 or 330 gal) | Holds water supply; gravity-feeds pump inlet | Food-grade HDPE; camlock or NPT bottom outlet |
| Intake fitting | Camlock adapter → hose | Connects IBC bottom valve to pump inlet line | Must match tote fitting type (see Section 3) |
| Pump | 12V demand pump (e.g., Shurflo 3.5 GPM) | Draws from IBC; builds 40–50 PSI; self-starts on pressure drop | 12V DC; self-priming; built-in pressure switch and check valve |
| Pressure smoothing | Accumulator tank (1–2 gal) | Eliminates pump pulsing at partial flow; reduces pump cycling | Pre-charged to ~2 PSI below pump cut-in pressure |
| Distribution | PEX or flexible tubing | Routes pressurized water to all fixtures | ¾" main; ½" branches |
| Power | 100W solar panel + 100–135Ah battery | Powers the 12V pump independently | Draws ~90W running; <50 Wh/day typical use |
💰 Total System Cost Range
Bare minimum (municipal water fill): $450–$750 · With sediment filter: $550–$900 · With UV for well/spring water: $650–$1,100 · Full filtration train: $700–$1,200 · Second IBC (double storage): add $150–$300. This is one of the most cost-effective functional water systems available for an off-grid dwelling.
Storage Vessel
IBC Tote Specifications
| Specification | Detail |
|---|---|
| Standard sizes | 275 gallons and 330 gallons — both on 40" × 48" pallet footprint |
| Weight (empty) | ~100 lbs — two people can move an empty tote; a full 275-gal tote weighs ~2,400 lbs |
| Construction | Translucent HDPE inner tank; galvanized steel cage; timber or composite pallet base |
| Top opening | 6" HDPE screw cap — used for filling and any gravity-feed from the top |
| Bottom fitting | 2" HDPE lever-action ball valve — the primary outlet for pump connection |
| Translucency advantage | Translucent tank allows passive visual water level monitoring without gauges |
| Duration (2 people, conservative) | ~13–14 days at 10 gal/person/day; ~5–6 days at 25 gal/person/day |
How Long Will the Tote Last?
| Household | Daily Use | 275-Gal Tote Duration | Two Totes (550 gal) |
|---|---|---|---|
| 1 person, water-conscious | 10 gal/day | ~27 days | ~54 days |
| 2 people, water-conscious | 20 gal/day | ~14 days | ~27 days |
| 2 people, moderate use | 50 gal/day | ~5.5 days | ~11 days |
| 4 people, moderate use | 100 gal/day | ~2.75 days | ~5.5 days |
| Most builders targeting weekly or bi-weekly fill intervals run 2+ totes. Washing machine adds significant consumption — plan accordingly. | |||
Critical First Step
Identify Your Bottom Fitting Type Before Buying Anything
Three Fitting Types — Not Interchangeable
IBC totes come with three different bottom valve styles: Camlock (quick-release coupling), 2" NPT thread, and square thread. A camlock adapter will not thread onto an NPT outlet. Always confirm your tote's fitting style before ordering any adapters. Bring the fitting dimensions to the hardware store or order a matching adapter set after physically measuring.
| Fitting Type | How to Identify | Adapter Needed | Notes |
|---|---|---|---|
| Camlock (most common) | Two lever arms on the outlet coupling; press levers to release | Male camlock → female NPT adapter | Danner's linked adapter (amzn.to/4mcI3fK); verify thread size on pump end matches pump inlet |
| 2" NPT thread | Standard tapered thread; no lever mechanism | 2" NPT → ¾" hose thread reducer | Common on older or industrial-spec totes; use PTFE tape on all NPT connections |
| Square thread | Coarse squared thread profile; less common | Dedicated square thread adapter required | Less common; often found on older European-spec totes; harder to source adapters |
The Connection Sequence: IBC to Pump
- Identify bottom fitting type (see table above)
- Install matching adapter onto the IBC's 2" ball valve — wrap NPT threads with PTFE tape
- Connect a short section of reinforced flexible hose (¾" or 1" ID) from the adapter to the pump inlet — flexible hose absorbs pump vibration
- Open the IBC's 2" ball valve — water flows by gravity to the pump inlet
- The 12V pump is self-priming — it will draw water up and build pressure on first start
Pumping System
Why 12V Demand Pumps Win This Application
| Pump Option | Why It Seems Appealing | Why 12V Demand Wins |
|---|---|---|
| 1 HP shallow-well pump (120/240V) | More flow rate; familiar technology | 4,000–6,000W startup surge trips inverters; overkill for IBC gravity-assist; requires large power system; documented to fail in real off-grid setups (Tiny Shiny Home) |
| Gravity-only (no pump) | No electricity needed; completely passive | IBC needs 35–50 ft of elevation above fixtures for adequate shower pressure — impractical without a tower |
| 12V demand pump (RV-style) | — | Self-priming; built-in check valve and pressure switch; 40–50 PSI output; powered by a single 100W solar panel; no inverter needed; easy to plumb with barb fittings; adequate for 1–4 person occupancy |
"Unless you need to pump water up from a well underground, these little 12V pumps are plenty powerful enough to push water around a property at large distances. Take it from us and don't over-power your water pump needs. Keep it simple."
— Tiny Shiny Home, after four pump house iterations
The Accumulator Tank — Solving the Pulse Problem
Without an accumulator, a 12V demand pump creates a pulsing effect at partial flow — the pump senses pressure dropping, fires briefly, restores pressure, shuts off, pressure drops again, fires again, many times per minute. Tiny Shiny Home documented this exactly: "if we turned on the water halfway there would be a weird pulse in the system." Full blast was fine; partial wasn't.
A 1–2 gallon accumulator tank between the pump outlet and distribution line stores a small pressurized volume so the pump doesn't fire for every small pressure variation. The result is smooth, pulse-free flow even at low flow rates. Pre-charge the accumulator to ~2 PSI below the pump's cut-in pressure (typically 28 PSI for a 30 PSI cut-in).
Pipe and Fittings
Distribution Layout
The Three-Tee Junction
From the pump outlet, run to three tees — each independently valved for isolation:
- Tee 1: Outdoor garden hose spigot on the exterior of the pump enclosure — outdoor washing, filling buckets, irrigation
- Tee 2: Main supply line running into the house — kitchen, bathroom, all interior fixtures
- Tee 3: Accumulator tank connection — the pressure-smoothing branch
Pipe Material Comparison
| Material | Pros | Cons | Best Use |
|---|---|---|---|
| Reinforced flexible hose | No tools; absorbs vibration; easy to relocate | Not UV-rated outdoors; some types kink | IBC-to-pump; pump-to-accumulator; temporary runs |
| PEX | Flexible; freeze-resistant (expands slightly); easy to cut; SharkBite compatible | Needs UV protection above-ground outdoors | In-wall and interior distribution; long horizontal runs |
| SharkBite push-to-connect | No tools; compatible with PEX, copper, CPVC; removable | More expensive per fitting; verify pressure rating | Transitions between materials; any future-disassembly connection |
| CPVC | Lightweight; pressure-rated; glued joints | Not freeze-tolerant; can't disassemble once glued | Permanent interior cold-water runs in non-freezing climates only |
| Tiny Shiny Home: "Diagnosing leaks or changing some of the plumbing was much easier to take apart and put back together unlike PVC where once it's glued you're stuck re-doing things." Flexible tubing with hose barbs is recommended for beginners. | |||
Water Supply
How to Fill the IBC
| Method | How It Works | Practical Notes | Cost |
|---|---|---|---|
| Truck/trailer haul (well share) | Load empty IBC in pickup bed or on trailer; drive to well share or fill station; fill; return | Most common method. Well share at ~$40/month is documented as cost-effective. 275-gal IBC weighs ~2,400 lbs full — verify payload capacity before hauling. | Low — fuel + share fee |
| Water delivery service | Commercial tanker fills IBC on-site | Simple; no hauling logistics; requires good road access | $50–$150/delivery |
| Rainwater catchment | Roof gutters direct rainfall to IBC via downspout diverter | Passive; free after setup; first-flush diverter recommended; verify local regulations | Low after initial setup |
| Spring or creek gravity feed | Natural source at higher elevation feeds IBC by gravity | Ideal if available; creek water requires filtration for potable use; spring box and intake screen required | Very low — pipe and spring box only |
💧 The Well Share Model
A well share is an arrangement where a property owner with a productive well allows neighbors or community members to access and fill containers for a monthly fee. Tiny Shiny Home documented their well share: "For about $40 a month we can put a 330-gallon IBC Tote in the bed of our truck, fill it ourselves, bring it back." For a 2-person household at ~70 gallons/week, a 275-gallon IBC provides nearly a 4-week supply — meaning fills can be as infrequent as once a month at conservative use.
Position the IBC Before Filling
A full 275-gallon tote weighs ~2,400 lbs. A full 330-gallon tote weighs ~2,900 lbs. Moving either requires a forklift, pallet jack, or telehandler. If at all possible, position the IBC in its permanent location before filling. Filling on-site with water delivered directly to the tote location is always preferable to moving a loaded tote.
Off-Grid Power
Solar Power System for the 12V Pump
| Component | Spec | Typical Cost | Notes |
|---|---|---|---|
| Solar panel | 100W 12V monocrystalline | $80–$150 | Renogy, Newpowa, HQST; kit versions include controller, mounts, and cables |
| Solar charge controller | 20A PWM or MPPT | Included in most kits | Prevents battery overcharge; MPPT 10–30% more efficient in partial shade |
| Deep-cycle battery | 100–135Ah 12V AGM or LiFePO4 | $80–$200 (AGM) / $200–$400 (LiFePO4) | AGM is lowest-cost; LiFePO4 is lighter, longer-lifespan, better depth of discharge |
| Wiring and fuse | 10 AWG wire; 30A inline fuse | $20–$40 | Fuse protects battery from short-circuit; size to pump's max current draw |
| Weatherproof enclosure | Rubbermaid tote or built enclosure | $20–$80 | Protects battery, controller, and pump; vent for AGM offgassing |
A Shurflo 3.5 GPM pump draws ~90W at 12V. At typical household use, the pump runs 15–30 minutes total per day — about 45 Wh/day. A 100W panel in 4–5 peak sun hours produces 400–500 Wh/day — approximately 10× the pump's daily energy requirement. The solar pump system is essentially never energy-limited for pump operation under normal use.
Water Quality
Filtration for IBC Potable Water
Food-Grade Totes Only — The Label Is Your Only Confirmation
Only use IBC totes for drinking water if they previously held a food-grade product AND the label is still intact confirming the previous contents. HDPE absorbs chemical traces from non-food contents that cannot be fully removed. Avoid totes with unknown history. Avoid totes that held anything with a persistent odor — even food-legal flavorings can be extremely difficult to rinse out completely.
| Stage | Filter Type | Position | Required For |
|---|---|---|---|
| 1 | Sediment filter (50–100 micron) | Between IBC outlet and pump — protects pump | All sources |
| 2 | Fine sediment (5–20 micron) | After pump, before accumulator | All sources |
| 3 | Carbon block or activated carbon | After fine sediment | Well share, spring, or any source with taste/odor |
| 4 | UV disinfection | Final stage before distribution; requires turbidity <1 NTU | Well share, spring, rainwater, surface water — anything not municipally treated |
| 5 (optional) | Under-sink RO | Kitchen sink only | Only if well test reveals nitrates, arsenic, or heavy metals |
| Municipal water fills from a city tap require only sediment filtration (Stage 1–2) for most uses. Well share water requires Stages 1–4 at minimum — test the specific well annually. | |||
Build List
Complete Bill of Materials
| Component | Spec | Est. Cost | Source |
|---|---|---|---|
| IBC tote (food-grade, used) | 275 or 330 gal | $100–$250 | Craigslist, Facebook Marketplace, industrial liquidators |
| IBC tote cover | Fitted UV/debris cover | $40–$80 | Amazon — "IBC tote cover 275 gallon" |
| IBC camlock adapter | Male camlock → female NPT | $15–$30 | Amazon; verify size matches your tote's 2" coupler |
| 12V demand pump | Shurflo 3.5 GPM 12V (or equivalent) | $50–$100 | Amazon, RV supply, irrigation suppliers |
| Accumulator tank | 1–2 gal 12V system accumulator | $30–$60 | Amazon — "accumulator tank 12v water pump" |
| Solar panel | 100W 12V monocrystalline | $80–$150 | Amazon, Home Depot, Northern Tool; Renogy starter kits |
| Solar charge controller | 20A PWM (included in most kits) | Included / $20–$40 | Included in Renogy starter kit |
| Deep-cycle battery | 100Ah 12V AGM | $80–$150 | Walmart (marine batteries), auto parts stores |
| Pump enclosure | Weatherproof box or DIY built | $20–$80 | Hardware store or 2×4 and plywood |
| PEX pipe (¾" main, ½" branches) | Varies by run length | $0.30–$0.60/ft | Home Depot, Lowe's; buy a coil |
| SharkBite push-to-connect fittings | Tees, elbows, couplings | $5–$15 each | Home Depot, Lowe's |
| Ball valves | ¾" and ½" for isolation | $8–$15 each | Hardware store |
| Sediment filter housing + cartridge | Whole-house; 5-micron | $30–$60 | Amazon, hardware store |
| Carbon filter (optional) | Inline carbon cartridge | $15–$30 | Amazon |
| UV disinfection unit (non-municipal sources) | Sized for 3.5 GPM | $80–$200 | Amazon — Viqua, Pentair, or similar |
Total System Cost Scenarios
Bare minimum — municipal water fill, no filtration$450–$750
+ Sediment filtration$550–$900
+ UV for well/spring water$650–$1,100
Full filtration train (sediment + carbon + UV)$700–$1,200
Second IBC tote (double storage)add $150–$300
Know Before You Build
Limitations and Freeze Protection
Limitations to Plan For
- Manual refill required — no auto-fill; plan fill trip frequency based on usage and storage volume
- Conservation habits matter — guests, laundry, and simultaneous use draw down faster than solo daily estimates
- Scale with storage — add a second IBC rather than dramatically increasing pump size
Freeze Protection — Required in Cold Climates
- The IBC bladder can crack if water freezes solid inside
- All exposed plumbing is vulnerable — especially PVC and PEX fittings
- Insulate the IBC with a commercial IBC insulation jacket
- House the pump and battery in an insulated enclosure with a thermostat-controlled heater
- Install drain valves at all low points; drain the system before any hard freeze
- Use freeze-proof (self-draining) yard hydrants for outdoor water access
Frequently Asked Questions
Yes — a food-grade IBC tote is one of the most cost-effective primary storage vessels available for an off-grid water system. At $100–$250 used, a 275-gallon tote holds enough water for a 2-person household for 2–4 weeks at conservative use, connects directly to a 12V demand pump via a camlock or NPT adapter, and has a standard 2" ball valve already installed at the bottom. The complete system including pump, solar, and basic fittings costs $450–$750.
A 12V RV-style demand pump such as the Shurflo 3.5 GPM is the standard choice. It draws less than 100W running, runs off a single 100W solar panel and one 100Ah battery, is self-priming, has a built-in pressure switch, and outputs 40–50 PSI — enough for all standard household fixtures. Avoid 1 HP 120V shallow-well pumps for this application — the startup surge trips inverters and the power requirement is far more than necessary for a surface-level gravity-assisted IBC system.
IBC totes come with three different bottom fitting styles — Camlock (quick-release), 2-inch NPT thread, and square thread — and they are NOT interchangeable. Always identify your specific tote's fitting type before purchasing adapters. The most common on food-grade totes is the camlock-style outlet. For camlock fittings, you need a male camlock to female NPT adapter. For NPT fittings, a 2-inch NPT to ¾-inch hose thread reducer. Bring the fitting dimensions to the hardware store or confirm the style before ordering online.
Pulsing at partial flow is the normal behavior of a 12V demand pump without an accumulator tank. The pump senses the small pressure drop when a tap is opened at low flow, fires briefly to restore pressure, shuts off, pressure drops again, and fires again — repeatedly. The fix is a 1–2 gallon accumulator tank between the pump outlet and the distribution line. The accumulator stores a small pressurized volume that absorbs partial-flow demand without triggering the pump. Pre-charge the accumulator to approximately 2 PSI below the pump's cut-in pressure.
Yes — only food-grade IBC totes with an intact label confirming previous food-safe contents should be used for potable water. HDPE absorbs chemical traces from industrial, pesticide, or solvent contents that cannot be fully washed out. The label is your only reliable confirmation. Never use a tote with unknown prior contents for drinking water. Even some food-legal products (concentrated flavorings, dyes) can be very difficult to fully rinse out — avoid anything with a persistent odor.
Related Guides
Keep Reading
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Buyer's Guide
IBC Tote Fittings
Camlock adapters, valves, and connections — what fits what.
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Buyer's Guide
IBC Tote Valves
Replacement and upgrade valves for IBC tote outlets.
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DIY
Pressure Washing Setup
Plumbing an IBC tote as a pressure washer water supply.
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Sourcing
Find Food-Grade Totes
Where to source clean IBC totes for water use.