The Marey GA series is the brand's outdoor propane tankless water heater lineup — designed specifically for outdoor mounting in camping, hospitality, and outdoor shower applications. GA models distinguish themselves from Marey's indoor propane lineup with weather-resistant housings, manual ignition options, and configurations optimized for ambient outdoor operation.
GA model lineup
- GA-5L: 1.5 GPM, single-shower outdoor use, manual ignition (D-cell batteries)
- GA-10L: 2.6 GPM, larger flow capacity, suitable for full shower or sink + shower
- GA-14L: 3.7 GPM, premium outdoor unit for multi-fixture outdoor use
Outdoor-specific features
- Weather-resistant exterior housing (rated for outdoor mounting under cover)
- Manual ignition (battery-powered or piezo) — no electrical hookup required
- Direct propane tank connection (20-lb portable tank standard)
- Garden-hose thread water connections (standard outdoor compatibility)
- Wall-mount brackets included for permanent outdoor installation
Typical outdoor applications
- Outdoor showers at pools, lake houses, beach houses
- Hunting cabins and remote retreats
- Hospitality outdoor wash stations
- RV exterior shower with permanent mounting (vs portable L-series alternative)
- Campground or RV park amenity stations
- Construction site outdoor wash facilities
Installation requirements
Outdoor installation requires:
- Sheltered mounting (under porch, gazebo, or eave) — direct rain exposure shortens life
- Propane tank within reach (5-foot hose typical) or hard-piped propane supply
- Garden hose or 1/2"–3/4" rigid plumbing for water
- Drainage at base for any condensate or rain runoff
- Proper vent termination (outdoor units exhaust directly into ambient air; verify no obstruction)
Cold-weather limitations
Outdoor propane tankless heaters cannot tolerate freezing temperatures during off-periods. Below 35°F ambient, drain the unit between uses or store indoors. Most outdoor installations are seasonal (April–October in northern climates) with full winterization at end of season.
Propane consumption
GA-5L at 36,000 BTU/hr empties a 20-lb propane tank in approximately 12 hours of continuous full-load operation. GA-10L at 74,500 BTU/hr empties the same tank in 6 hours. Real-world outdoor shower use (typical 8–12 minute shower) yields 30–50 showers per tank depending on water temperature and flow.
Manual ignition mechanics
GA-5L uses battery-powered ignition (2 D-cell batteries) with automatic flow activation. Larger GA models may have piezo (manual click) ignition with manual flow control. Verify ignition type before purchase — battery-powered is more convenient; piezo eliminates battery dependency.
GA vs Marey L-series (portable)
L-series is fully portable (no mounting, no permanent connections). GA series is wall-mounted with permanent connections. For semi-permanent outdoor installations (lake house outdoor shower used every weekend), GA is the appropriate choice. For genuinely portable use (camping, occasional outdoor wash), L-series is better.
Maintenance schedule
Seasonal use: full drain and winterization at end of warm season; inspection at start of next season. Year-round (warm climates): annual flush, biannual flame sensor cleaning, quarterly visual inspection of all connections. Hard-water area: descaling annually.
Lifespan
GA outdoor units in seasonal service typically last 6–10 years. Year-round outdoor exposure (even sheltered) accelerates wear vs indoor installations. Heat exchanger is the typical failure point at year 7–10 in hard-water applications.