FOGATTI InstaShower 9 Pro RV Tankless Water Heater — 3.6 GPM, Built-in Mixing Tank, 66,000 BTU

The FOGATTI InstaShower 9 Pro is a high-output RV tankless water heater with a built-in mixing tank that delivers instant, stable hot water at up to 3.6 GPM for showers and sinks.

Designed for RV owners who want stronger, more consistent hot-water performance than conventional onboard tanks, the InstaShower 9 Pro combines a 66,000 BTU burner, precise temperature control and multiple safety systems in a compact cabinet. It replaces many 6-gallon tank units and adapts to larger openings with a retrofit door, while its altitude-capable design and rugged fan keep hot water flowing in demanding conditions.

How much hot water flow and temperature control can I expect?

The InstaShower 9 Pro produces up to 3.6 gallons per minute and maintains temperature within about ±1°F for consistent comfort during showers. A built-in mixing tank helps stabilize water temperature during sudden demand changes so you experience fewer temperature swings.

• Peak flow: 3.6 GPM for shower + sink use.
• High output burner: 66,000 BTU for rapid heating.
• Temperature precision: approximately ±1°F with mixing tank stabilization.
• Seasonal flame modulation: partial flames in warm weather, full flame rows in cold weather.

Will it fit my RV and replace my current water heater?

FOGATTI designed this model to be a drop-in upgrade for many common RV heater openings: it fits a 13"×13" cutout and includes a 15"×15" door and a 17.64"×17.64" trim ring. For rigs that used a 10-gallon tank heater, you can retrofit the unit into an 18"×18" door opening for compatibility.

• Standard fit: 13"×13" opening compatibility.
• Included parts: 15"×15" door and 17.64"×17.64" trim ring.
• 10-gallon tank replacement: retrofit to 18"×18" door if needed.
• Compatible replacements: fits Suburban, Atwood, Girard and Furrion scenarios with proper opening.

How reliable is it at altitude and in windy conditions?

The heater is built to operate reliably up to about 9,800 feet elevation and uses an upgraded NIDEC fan that delivers roughly 300 Pa of pressure. That fan and the heat-exchange design help maintain combustion and hot-water output even in high winds or thin-air environments.

• Altitude capability: functions smoothly up to ~9,800 ft.
• Forced-draft fan: upgraded NIDEC fan producing ~300 Pa.
• Wind resistance: designed to deliver hot water in winds approaching Beaufort 9 conditions.
• Stable combustion: multiple safety cutoffs for flame failure and exhaust control.

What safety and convenience features are included?

FOGATTI includes a number of accessories and safety elements so you don’t need to add extras: a 150 PSI pressure relief valve, a filter screen to block large particles, an intelligent remote controller, and CSA certification. Built-in anti-freeze protection and an automatic gas shut-off improve camper safety.

• Included pressure relief valve: 150 PSI rated and preinstalled.
• Filter screen: reduces sand and large debris entering heat exchanger.
• Remote controller: intelligent wireless control up to 6.6 feet.
• Certifications & protections: CSA certified, forced exhaust fan, flame-failure gas shut-off, anti-freeze safeguards.

Who is this for: The InstaShower 9 Pro is aimed at RV owners who need stronger, tankless hot-water performance without sacrificing safety or fitment flexibility. It suits couples or families who run simultaneous fixtures, travelers heading to high altitudes or windy coastal routes, and owners replacing older 6- or 10-gallon tank heaters with a compact, higher-capacity tankless solution.