Why Upgrade from a Tank Heater to Tankless?
A standard 6-gallon RV tank heater stores a fixed amount of hot water. Once it's gone, you wait. That 20- to 30-minute reheat cycle means staggered showers, cold dishwater, and constant propane burn just to keep the tank at temperature, even when nobody's using it.
Tankless water heaters work differently. Water only heats when you turn on the faucet. A flow sensor activates the burner, and hot water flows continuously until you shut it off. There's no standby heat loss and no tank to drain.
The efficiency gains are significant. Tankless heaters are 24% to 34% more energy efficient than conventional storage tank models. For boondockers watching every ounce of propane, that translates directly into more days off-grid.
Longevity matters, too. Tankless units typically last 20 to 30 years, roughly double the 10- to 15-year lifespan of a tank heater. When you factor in the growing off-grid camping trend (there are now 8.1 million RV-owning households in the U.S., with boondocking surging among younger owners), a propane-efficient, on-demand hot water system isn't a luxury. It's the smartest upgrade you can make.
So why Fogatti specifically? The InstaShower lineup answers that question directly.
Fogatti InstaShower Lineup: Which Model Is Right for You?
The InstaShower series is a tiered lineup built for different RV sizes and use cases. Every model runs on propane, operates on DC 12V power, and uses automatic pulse ignition. No shore power required. Here's how they break down.
InstaShower 7 and 8 Plus: Entry to Mid-Range
The InstaShower 7 steps up to 48,000 BTU and 2.5 GPM. This is the model most upgraders will want. It fits the standard 13"x13" cutout and comes with a 15"x15" door, making it a direct drop-in replacement for Suburban and Atwood 6-gallon tank heaters. It also swaps directly with Girard and Furrion tankless units.
The InstaShower 8 Plus pushes to 55,000 BTU and 2.9 GPM at 84% efficiency. It weighs just 25 lbs, operates at 14.5 to 116 PSI water pressure, and is priced at $569.99. A strong mid-range option for rigs that need a bit more output.
InstaShower 8 Pro, 9 Pro, and Ultra: High-Performance Tier
All high-performance models operate at altitudes up to 9,800 feet using staged dual-stage combustion. If you camp in Colorado, Wyoming, or Utah, that's a spec worth paying attention to.
The InstaShower 8 Pro produces 60,000 BTU at 2.9 to 3.1 GPM. It's a meaningful step up for larger rigs or families who run multiple fixtures.
The InstaShower 9 Pro is the flagship for most buyers: 66,000 BTU and 3.6 GPM, with a built-in mixing tank that holds water temperature within ±1°F. Temperature swings during showers are the top complaint among RV owners who've tried other tankless units. The 9 Pro was engineered to solve that problem.
The InstaShower Ultra (Supreme Series) matches the 9 Pro's 66,000 BTU output but adds HydroShield-Tech weather resistance, a 300Pa fan rated for winds up to Beaufort Scale 9, and an ultra-low 0.5 GPM activation flow. That last spec matters most for boondockers. If you're running on an RV water pump without city hookup, most tankless heaters won't even fire. The Ultra will.
Key Features Deep Dive
Instant hot water: Real-world user reviews consistently confirm hot water arrives within 15 to 25 seconds of turning on the faucet. No preheating, no waiting.
Compact and lightweight: The InstaShower 8 Plus weighs approximately 25 lbs and fits standard RV water heater bays without any structural modification. You're not cutting into your rig's walls.
Energy efficiency: An 84% efficiency rating combined with staged combustion technology means the unit adapts to conditions. In summer, fewer burner rows fire to prevent overheating. In winter, all rows activate for maximum heat output. This conserves propane and extends your off-grid time.
Safety features: Every InstaShower includes a built-in forced exhaust fan, automatic gas shut-off on flame failure, anti-freeze protection, and a 150 PSI pressure relief valve in the box. All models carry both CSA and ETL certifications, confirming they meet North American safety standards.
The 20-minute auto-shutoff: This is a safety timer, not a defect. After 20 minutes of continuous use, the unit shuts off automatically. A quick press of the ignition button restarts it immediately. It's worth knowing about before you buy so it doesn't catch you off guard.
Fogatti backs every InstaShower with a free 24-month warranty and phone technical support throughout your ownership. That level of post-purchase support adds real confidence beyond the hardware itself.
Real-World Performance: Does It Deliver?
The core question: is 2.5 to 3.6 GPM actually enough for a satisfying RV shower? A standard RV showerhead flows at 1.5 to 2.0 GPM. So even the entry-level InstaShower 6 delivers more hot water than your showerhead can use. The higher-output models give you enough flow to run a shower and a kitchen faucet simultaneously.
Users consistently report hot water within 15 to 25 seconds and stable temperature throughout showers lasting 20 minutes or more. The 9 Pro's ±1°F temperature precision is a genuine comfort upgrade over older units that swing between scalding and lukewarm.
A documented case from a popular RV forum in June 2025 details a Girard GSWH-1 to Fogatti 9 Pro swap. The owner confirmed that mounting holes matched perfectly, no propane line changes were needed, and performance after six months of use was described as "flawless."
For a direct comparison: the Girard GSWH-2 delivers just 1 to 1.5 GPM at 42,000 BTU. The Fogatti InstaShower 7 puts out 2.5 GPM at 48,000 BTU. That's significantly more flow and more heating power at a competitive price.
High-altitude performance is verified, too. Dual-stage combustion has been tested to 9,800 feet, making the InstaShower a reliable choice for mountain destination campers who can't afford a unit that struggles with thinner air.
Installation: A True DIY Drop-In Upgrade
The InstaShower 7 fits the standard 13"x13" RV water heater cutout, the same opening used by Suburban, Atwood, Girard, and Furrion units. For most upgraders, this means a true drop-in swap with no modifications to your rig.
Here's the basic process:
- Shut off propane and water supply.
- Remove the old water heater unit.
- Connect the propane line (no modifications needed for standard fittings).
- Connect DC 12V power from your RV battery.
- Connect water inlet and outlet lines.
- Mount the unit and secure it.
- Test ignition and check for leaks.
No shore power or continuous electricity is required. The unit runs entirely on DC 12V battery power, which makes it ideal for boondockers and off-grid setups.
Not sure which model fits your rig? Fogatti's RV Water Heater Calculator tool helps you confirm the right model before you buy. If you hit a snag during installation, Fogatti's free phone technical support is available to walk you through it.
Remember: if you're replacing a 10- or 12-gallon tank heater, you'll need to retrofit to an 18"x18" door. Factor that into your project plan.
Fogatti InstaShower vs. Competitors
vs. Girard GSWH-2 (Lippert): The Girard delivers 1 to 1.5 GPM at 42,000 BTU. The Fogatti InstaShower 7 delivers 2.5 GPM at 48,000 BTU. More flow, more heat, and a competitive price point. For most buyers, the math is straightforward.
vs. Suburban and Atwood tank heaters: Traditional tanks give you 8 to 15 minutes of hot water and then stop. The InstaShower provides unlimited on-demand flow. There's no comparison in daily usability.
Manufacturing credibility: Fogatti's parent company, Powtek, has been in the gas appliance industry for roughly 20 years and has exported to 50+ countries since 2018. This isn't a startup brand. It's a manufacturer with deep production expertise.
Price positioning: The InstaShower 8 Plus at $439.99 to $549.99 and the 9 Pro at $699.99 represent strong value against competitors with comparable (or lower) output. Add Fogatti's 24-month warranty, free shipping within 1 business day, and 30-day return policy, and the purchase experience stands out.
Both CSA and ETL certifications confirm the InstaShower meets North American safety standards. Not every competitor can say the same.
Pros and Cons of the Fogatti InstaShower
Pros:
- Unlimited on-demand hot water with no tank to drain
- Direct drop-in fit for most standard RV cutouts (13"x13")
- No shore power required; runs on DC 12V battery
- High BTU output across all models (42,000 to 66,000 BTU)
- CSA and ETL certified with multiple safety features
- Anti-freeze protection and automatic gas shut-off
- 24-month warranty and dedicated phone support
- Competitive pricing with free 1-business-day shipping
Cons:
- 20-minute auto-shutoff timer requires a manual restart (minor inconvenience, not a defect)
- Replacing 10- or 12-gallon tank heaters requires an 18"x18" door retrofit
- Higher upfront cost than basic tank heaters (though long-term savings offset this)
Who Is the Fogatti InstaShower Best For?
Full-time RVers and digital nomads: Daily hot water reliability isn't optional when the road is your home. The InstaShower delivers without wasting propane on standby heating.
Boondockers and off-grid campers: DC 12V operation, 0.5 GPM activation (Ultra model), and a 14.5 PSI minimum pressure make the InstaShower viable without city water hookup.
Families with kids: 43% of RV owners have children under 18. Never running out of hot water for baths, dishes, and back-to-back showers is a real quality-of-life improvement.
High-altitude adventurers: Verified performance to 9,800 feet through dual-stage combustion. If you camp in Colorado, Wyoming, or Utah, this matters.
DIY upgraders: If you're replacing an aging Girard, Suburban, or Atwood unit, the drop-in compatibility removes the biggest installation barrier.
Weekend warriors: Fast heat-up, consistent temperature, and compact design deliver a home-quality shower experience, even on a two-night trip.
Frequently Asked Questions
Can it run on low water pressure?
Yes. The minimum activation pressure is 14.5 PSI, which is compatible with most RV water pump systems. The Ultra model activates at just 0.5 GPM, making it especially suited for boondocking without city hookup.
Does it need electricity or shore power?
No. All InstaShower models run on DC 12V battery power only. No shore power connection is required.
What's the 20-minute auto-shutoff, and how do I reset it?
It's a built-in safety timer that shuts the unit off after 20 minutes of continuous use. Simply press the ignition button to restart. This is a safety feature, not a malfunction.
Will it work at high altitudes like Colorado or Wyoming?
Yes. Dual-stage combustion is verified to 9,800 feet. The system adjusts flame intensity automatically based on conditions.
Does it replace my Suburban or Atwood water heater without modifications?
The InstaShower 7 fits the standard 13"x13" cutout directly. If you're replacing a 10- or 12-gallon tank unit, you'll need an 18"x18" door retrofit.
What about winterization for the mixing tank on the 9 Pro?
Drain the mixing tank before freezing temperatures arrive. Anti-freeze protection activates automatically, but manual winterization is recommended for extended cold storage.
