The Eccotemp L-series is the brand's outdoor portable propane tankless water heater line — designed for camping, outdoor showers, RV exterior applications, and any installation where running a permanent propane line and venting is impractical. The L5 (1.5 GPM) and L10 (2.6 GPM) are the most-sold models, with the L7 occupying the middle ground.
What "portable" means in practice
L-series units connect to a standard 20-lb propane tank via a quick-connect regulator hose (included). Water connection is garden-hose thread. The unit has integrated wall-mount brackets but is also commonly used freestanding hung from a tree branch, RV exterior, or shower enclosure frame. Battery-powered ignition (2 D-cell batteries) eliminates the need for electrical hookup — the unit operates fully off-grid.
Sizing for actual use
L5 at 1.5 GPM delivers comfortable shower flow with a low-flow showerhead (1.5–1.8 GPM rating). L10 at 2.6 GPM handles standard showerheads or shower-plus-sink simultaneous use. For two simultaneous showers, L-series capacity is insufficient — that requires Eccotemp's indoor whole-house models (FVI, EM series).
Cold-weather limitations
L-series units have manual ignition with no antifreeze provision. Below 40°F ambient, the heat exchanger can freeze when not in use, causing heat-exchanger cracking. For camping in cold weather, drain the unit between uses. Eccotemp publishes a winterization procedure for owners who store L-series units in unheated spaces.
Propane consumption
L5 consumes approximately 36,000 BTU/hr at full fire — a 20-lb propane tank lasts about 12 hours of continuous full-load operation. L10 at 74,500 BTU/hr empties the same tank in roughly 6 hours of continuous use. Real-world camping use (10–15 minute showers, intermittent operation) yields multiple days per tank.
Setup and operation
Connect: propane tank to regulator hose to unit, garden hose for water supply, output hose to showerhead. Open propane tank, turn unit's flow control knob to start water (water flow triggers automatic ignition with the D-cell batteries spark-firing the burner), adjust temperature with gas control knob.
Common L-series troubleshooting
- Unit won't ignite: low batteries — replace with fresh D-cells. Verify propane valve open and regulator connected properly.
- Lukewarm water: flow too high for the unit's BTU output. Reduce flow at the showerhead.
- Pulsing flame / inconsistent heat: water inlet pressure too low or too variable. Garden hose or pressurized RV water supply with consistent pressure works best.
Limitations vs indoor whole-house tankless
L-series is genuinely engineered for outdoor/portable use. It's not a substitute for permanent residential whole-house tankless — flow capacity is too limited for indoor service, and the lack of sealed combustion means it can't safely operate indoors without specific exhaust configuration. For permanent residential propane tankless, look at Eccotemp's FVI or indoor-rated models.