Fogatti

Fogatti InstaShower Ultra 66K BTU RV Tankless Water Heater with Mixing Tank

Regular price $749.99 USD

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$749.99 USD
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Fogatti InstaShower Ultra 66K BTU RV Tankless Water Heater with Mixing Tank


Description

The Fogatti InstaShower Ultra is the highest-output tankless water heater in the Fogatti RV lineup, delivering 66,000 BTU and up to 3.9 GPM of hot water on LP propane with no 120V hookup required. Designed for full-time RVers, couples, and families who demand consistent performance, it features a built-in mixing tank that reduces the cold-water interruption common in RV plumbing loops when the shower stops and restarts. Segmented combustion adapts the burner to seasonal conditions - two flame rows in summer to prevent overheating, and all five rows in winter for cold-weather reliability.

With HydroShield-Tech weather resistance, operation up to 9,800 feet altitude, and ultra-low 0.5 GPM activation, the InstaShower Ultra is built for demanding travel routes and varied climates. It drops into most standard RV water heater openings and is available with multiple door size options to match your existing wall cutout. Whether you're replacing a factory unit or upgrading from an older tankless model, this is Fogatti's strongest platform for shower comfort on the road.


Key Features

  • 66,000 BTU Output: Highest heat input in the Fogatti InstaShower range - powers simultaneous hot water use in the bathroom and kitchen.
  • Up to 3.9 GPM Flow: Maximum flow rate in the lineup, with delivered flow shaped by inlet temperature, pressure, and requested temperature rise.
  • Built-In Mixing Tank: Blends water inside the heater to reduce cold-water interruption when the shower stops and restarts - the key comfort difference over standard tankless units.
  • Segmented Combustion: Two flame rows in summer prevent overheating; all five rows engage in winter for consistent performance in colder inlet water conditions.
  • ±1°F Temperature Stability: Tight temperature-control target for steady, predictable shower temperatures throughout use.
  • 0.5 GPM Low-Flow Activation: Ultra-low ignition threshold supports water conservation and Navy-style showering without sacrificing comfort.
  • HydroShield-Tech Weather Resistance: Stormproof construction with a 300Pa fan rated for winds up to Beaufort Scale 9, designed for all-weather RV travel.
  • High-Altitude Rated: Operates reliably up to 9,800 feet elevation, suitable for mountain and western routes.
  • 12V DC Powered Controls: Ignition and controls run on 12V DC only - no shore power or generator required for operation.
  • 150 PSI Pressure Relief Valve Included: Pre-installed for safety, no separate purchase or installation needed.
  • Multiple Door Size Options: Compatible with 15x15, 15x18, and 18x18-inch RV openings; also available heater-only without door.
  • Smart Wired Controller: Intelligent remote controller included, operable up to 6.6 feet away.

Door Options & Which to Choose

  • Without Door: Heater-only configuration - exterior access door is not included. Best for owners who already have a compatible door or are sourcing one separately.
  • 4/6 Gallon Door 15"x15" Square: Taller rectangular replacement door with extra vertical coverage. Ideal for standard RV water heater openings sized 15 by 15 inches.
  • 6 Gallon Door 15"x18" Rectangle: Large rectangular replacement with broad trim coverage. Best for taller RV water heater openings requiring more vertical clearance.
  • 10/12/16 Gallon Door 18"x18" Square: Largest square replacement door with the broadest trim coverage. Designed for larger RV water heater openings - the right choice when replacing a big-tank unit in a wider cutout.

Shipping

Ships free! Please email us at service@omahasportsandgames.com for a delivery ETA or to confirm shipping details.


What's Included

  • InstaShower Ultra 66K BTU Tankless Water Heater Unit x1
  • Smart Wired Controller x1
  • 150 PSI Pressure Relief Valve x1 (pre-installed)
  • Exterior Access Door (in selected color and door size, if door option chosen)
  • Insulation Strip x1
  • Waterproof Sealing Strip (EPDM) x1
  • Mounting Screws (ST5x25) x12
  • Mounting Screws (ST4x16) x2
  • Installation and Operation Manual x1

Why You'll Love It

The InstaShower Ultra is built for RV owners who refuse to compromise on shower quality - whether they're boondocking in the desert, camping at elevation, or running back-to-back showers for the whole family. The built-in mixing tank tackles the most common complaint about RV tankless heaters: that frustrating blast of cold water every time you pause the shower. With the Ultra, that interruption is dramatically reduced, making every restart feel smooth and consistent. Trusted by RV enthusiasts replacing factory-installed Furrion, Girard, and other OEM units, the InstaShower Ultra drops right in with minimal modification and starts delivering results from the first trip. At 66,000 BTU with up to 3.9 GPM, it's the strongest Fogatti platform available and backs it up with a 2-year warranty, HydroShield weather protection, and high-altitude capability that goes wherever your rig does.


Product Specifications

View Product Specs
Heat Input 66,000 BTU
Hot Water Flow Rate 0.5 - 3.9 GPM
Temperature Control ±1°F target
Fuel Type LP Propane
Electrical Supply 12V DC
Maximum Altitude 9,800 ft
Unit Dimensions 17.6 x 14.3 x 17.6 in
Weight 26.9 lbs (12.2 kg)
Door Options 15x15 in, 15x18 in, 18x18 in (or without door)
Minimum Clear Opening 13 x 13 in
Fan Static Pressure 300 Pa
Wind Resistance Beaufort Scale 9
Pressure Relief Valve 150 PSI (included)
Warranty 2 Years

FAQ

What does the mixing tank actually do?

The built-in mixing tank blends water inside the heater before it exits to your plumbing. In a standard RV tankless setup, pausing the shower and restarting it often causes a brief cold-water interruption while the burner reignites. The mixing tank buffers this by pre-blending water, significantly reducing that cold shock when you turn the flow back on.

Does this water heater need 120V shore power to operate?

No. The controls and ignition system run on 12V DC power, which is available from your RV's battery system. The burner uses LP propane. No 120V shore power or generator connection is required for normal operation.

How do I choose the right door size?

Measure your existing RV water heater wall cutout and match it to the available door options: 15x15, 15x18, or 18x18 inches. If you already have a door or are sourcing one separately, choose the "Without Door" option. The installation manual includes full guidance on fit and clearance requirements.

Will this unit fit where my old tank water heater was installed?

The InstaShower Ultra requires a minimum clear opening of 13x13 inches and is compatible with most standard RV water heater openings. Many owners have successfully replaced Furrion, Girard, and factory OEM tankless units directly. Check the installation guide for exact clearance, venting, and utility connection requirements before installing.

Can I use this at high altitude or in cold weather?

Yes. The InstaShower Ultra is rated for operation up to 9,800 feet altitude. Its segmented combustion system engages all five burner rows in cold conditions to maintain performance with cold inlet water. HydroShield-Tech provides stormproof weather resistance, and the 300Pa fan is rated for winds up to Beaufort Scale 9. Proper winterization is still recommended when temperatures drop below freezing.

What is the flow rate and how does it compare to other Fogatti models?

The InstaShower Ultra delivers up to 3.9 GPM - the highest in the Fogatti lineup. The InstaShower 9 Pro offers up to 3.6 GPM at the same 66K BTU, while the InstaShower 8 Plus delivers up to 2.9 GPM at 55K BTU. Actual delivered flow depends on your inlet water temperature, water pressure, and the temperature rise you request.

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