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  1. RV Water Heater
  2. Fogatti
  3. Tankless Water Heater
  4. Gas
  5. 14-5/16L x 18W x 18D Inch
  6. 40001 - 55000 Btu
Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 18"x18" White Door
Fogatti

Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 18"x18" White Door

Part Number: FG58FR
In Stock
$629.99
RV Water Heater
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This tankless hot water heater has higher Btus for more effectively heating cold water. Heats 2.9 gallons per minute, which is more than an average fixture uses. Includes a door for replacing an old 10- or 16-gallon tank water heater. Great Prices for the best rv water heater from Fogatti. Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 18"x18" White Door part number FG58FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (17)
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Fogatti RV Water Heater - FG58FR

  • Tankless Water Heater
  • Gas
  • Fogatti
  • 14-5/16L x 18W x 18D Inch
  • 40001 - 55000 Btu
  • White Door
  • 12 Volts
  • 13L x 13W x 13-13/16D Inch Cutout

This tankless hot water heater has higher Btus for more effectively heating cold water. Heats 2.9 gallons per minute, which is more than an average fixture uses. Includes a door for replacing an old 10- or 16-gallon tank water heater.


Features:

  • Tankless gas water heater provides endless hot water on demand inside your RV
    • Heats 2.9 gallons per minute, greater than the average water flow of an RV shower
  • Efficient propane burner heats water only when you use your faucets or shower
    • Higher Btus make this a great choice in cold weather or for using a lot of hot water at once
  • Wall controller with digital display lets you adjust temperature and shows diagnostic error codes
  • Internal safety components protect you, your family, and your RV
    • Automatically cuts off gas if the flame goes out to prevent leaks in your RV
    • Keeps its water lines warm so they don't freeze or burst in cold weather
  • Larger size hinged door with flat lock provides easy access for cleaning or maintenance
    • Sized for replacing a 10- or 16-gallon tank water heater with a 18" x 18" access door
  • Simple installation using included hardware and existing lines and cutout
    • Temperature and pressure relief valve is included
    • Additional cutout depth needed to make connections


Specs:

  • Overall dimensions: 14-5/16" long x 18" wide x 18" tall
    • Cut out dimensions: 13" wide x 13" tall x 13-13/16" deep
  • Operating waterflow: 2.9 gallons of hot water per minute
  • Heating capacity: 55,000 Btu
  • Temperature settings: 95 F to 123 F (35 C to 50 C)
  • Gas pressure: 8-13 WC
    • Preferred pressure: 11 WC
  • Water pressure: 14.5-116 PSI
    • Preferred pressure: 40-45 PSI
  • Heat source: LP gas
  • Pilot ignition type: automatic
  • Voltage: 12V DC
  • 2-Year warranty


What size water heater access door do I need?

If you're replacing an old tank or tankless water heater, you'll want to pick a water heater with a door that will at least be as large as the current access door on your RV. Be sure to search for the water heater that includes the correct size you need.


Fogatti 8 Plus Door Options

Door Size Door Color etrailer Part Number
15" x 15" White FG66FR
Black FG76FR
15" x 18" White FG86FR
Black FG26FR
18" x 18" White FG58FR
Black FG38FR


Fogatti 7 vs. 8 Plus vs. 8 Pro

Fogatti's tankless hot water heaters are popular for being efficient and quality options, but which model would be best for you? Let me give you a quick summary:


Fogatti 7: Lower Btus and lower flow rate compared to the 8s. This can be a good pick, though, because that means you're using less propane to heat water. If you aren't trying to heat very cold water, and you don't expect that anyone else is going to be using hot water while you're in the shower, then this will be a perfectly fine option, especially if you use low-flow fixtures for conserving water. I'd recommend it for solo campers or couples who almost never camp in cold months.


Fogatti 8 Plus: Higher Btus and flow rate while being the same size as the 7. You'll get slightly better performance, and it will be more effective at heating colder water. The extra flow rate won't necessarily allow you to run both a faucet and a shower at the same time without noticing a difference, since both fixtures can use 2.5 gallons per minute. But if you have a higher-flow shower head, this can keep up better. I'd recommend it if you're likely to camp when it gets chilly overnight and want a little extra performance.


Fogatti 8 Pro: This is the same as the 8 Plus, with the addition of a water mixing tank. This tank adds a few more inches to its depth, but that generally won't be much of an issue, especially if you're replacing a water heater with a tank. I'd recommend it if any variance in water temperature is going to really annoy you.



Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 18"x18" White Door

Installation Details FG58FR Installation instructions



Ratings & Reviews

4.9

16 reviews
This tankless hot water heater has higher Btus for more effectively heating cold water. Heats 2.9 gallons per minute, which is more than an average fixture uses. Includes a door for replacing an old 10- or 16-gallon tank water heater.

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order arrived quickly and the install was easy and straight forward



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So far so good. Easy to install.



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Priced right and delivered quick!



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Great water heater. I called e-trailer before and got some good advice on which was the best replacement for my unit. Relatively easy install, fits perfectly and tons of hot water quickly.



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Easy installation, and was exactly as a dvertised



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We installed the Fogatti InstaShower 8 Plus, purchased 6-11-2025 received 6-12-2025.
We're loving the long showers, not running out of Hot Water! It works great! Hope it continues over the long time. Installed easy..



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Fit like a glove, works great. Install was even easier than removing the old tanked system. Just follow the directions and don't shortcut. Just be aware that not all manufacturers use the same color code on wires. Use a meter and CHECK the lines. Mine didn't match but I checked them first as recommended.


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See what our Experts say about this Fogatti RV Water Heater

  • Does The Fogatti InstaShower 8 Plus Tankless Water Heater Include The Access Door?
    The Fogatti InstaShower 8 Plus RV Tankless Water Heater # FG97FR does not include the door, it is just the tankless heater unit. If you are also looking for a door, I have them listed below as there are a few sizes offered. I also included the “kit” part numbers, which is the complete part (heater and door together). 15” x 15” White Door # FG67FR (Kit part # FG66FR ) 15” x 15” Black Door # FG77FR (Kit part # FG76FR ) 15” x 18” White Door # FG87FR (Kit part # FG86FR ) 15” x 18” Black Door...
    view full answer...
  • Replacing Atwood GC10A Tanked Water Heater With Tankless Water Heater In Grand Design Reflection 303
    Jenna and Kyle, absolutely. The Fogatti InstaShower water heater # FG38FR is the right door size (18" by 18") for replacing the Atwood 10-gallon cutouts. You’ll go from limited 10-gallon capacity to endless hot water, which is huge for full-timers. And it's more efficient since it only heats water when you need it. The # FG58FR in white works the same if that trim matches your rig better. Do you do most of your maintenance yourselves, or hire it out when needing work done?
    view full answer...
  • Will Fogatti InstaShower 8 Tanless Water Heater Cold Water Sandwich You Mid Shower?
    Megan, older tankless heaters were known for that, but Fogatti improved the design. The Fogatti 55k btu tankless water heater with 18" by 18" black door # FG38FR uses a microprocessor to regulate flame output and stabilize temps when flow changes, so you don’t get icy blasts when the pump cycles or another faucet opens. The # FG58FR is the same inside, but has a white exterior service door if that matches your RV better than black. Do you usually camp with kids opening faucets mid-shower,...
    view full answer...
  • Will Fogatti Tankless Water Heater Keep Up With 2 People Showering Off Grid For A Week?
    Evan, that’s exactly the kind of trip the # FG38FR shines on. With 55,000 BTU capacity, it’ll hold a steady shower even when your pump and tank is the only water source. The white-door version is # FG58FR if you want that look instead of black. Since you’re boondocking, your limiting factor will be tank capacity and propane supply, not the heater itself, so make sure that is all topped off and you'll be good! How big is your fresh tank setup? That’ll tell us how long you can stretch...
    view full answer...
  • Does Fogatti FG38FR Tankless Water Heater Need Winterized Every Trip In Minnesota Winter?
    Alan, the Fogatti # FG38FR includes a built-in antifreeze cycle it kicks on at about 43°F to keep water inside from freezing, as long as propane and 12V power are available. For long winter storage, draining is still smart. The white-door # FG58FR has the same feature. Since you’re in Duluth, I’d still plan on winterizing if you’re leaving the RV unattended in January. Do you usually camp year-round, or just extend your season into late fall?
    view full answer...
  • Does Fogatti InstaShower Tankless Water Heater Work With Water Pump Or Just City Water Hookup On RV?
    Chris, the Fogatti Tankless Water Heater w/ black door # FG38FR works with either. Your onboard pump typically 40–55 PSI, ~3–4 GPM provides enough pressure and flow to fire the heater. On city water, you’ll want a regulator around 45 PSI to protect your RV plumbing. The # FG58FR is identical, but has a white service door if that matches your RV better than black. Do you camp mostly at campgrounds with hookups, or are you running the pump off-grid more often?
    view full answer...
  • Comparing Girard Tankless Water Heater To Fogatti InstaShower Tankless Water Heater For RVs
    Maria, both brands are popular. The Fogatti # FG38FR in black or # FG58FR in white runs at 55,000 BTU and up to 2.9 GPM, while most Girard units are closer to 42,000 BTU and 2.3 GPM. That means Fogatti delivers steadier temps when multiple taps are used. Customers also like Fogatti’s wired digital controller - it makes dialing in temps easy. Do you usually run just one shower, or do you have family that’s using hot water at the same time?
    view full answer...
  • Can Fogatti InstaShower 8 Tankless Water Heater Run Off Single 30lb Propane Bottle?
    Stephanie, the Fogatti # FG38FR runs on propane and maxes at 55,000 BTU/hr. A 30-lb bottle has around 648,000 BTUs, so you’d get roughly 12 hours of full-fire runtime before it’s empty. Since the heater modulates and you’re not showering all day, that translates to weeks of normal use. The # FG58FR works the same, but has a white door if you'd rather have that. Do you mostly camp at hookup sites, or are you boondocking where propane supply is critical?
    view full answer...
  • Can Suburban SW10DE 16x18 Door On Jayco Eagle Be Replaced With Fogatti Tankless Water Heater 18x18?
    Yes Rick, the Fogatti Water Heater # FG38FR 's 18×18 black door will cover the Suburban 10-gallon opening, though you may have to square up the cutout or add trim since Suburban doors vary slightly. That’s a common Jayco upgrade. If you’d rather go with white, the # FG58FR is the same unit. Have you looked at adding an accumulator tank to smooth out the pump flow? That helps the Fogatti hold temps steady even with pump cycling.
    view full answer...
  • upgrading suburban sw12de water heater in 2012 Keystone Montana with Fogatti tankless water heater
    Dave, you’re in luck - the Fogatti # FG38FR with its 18" × 18" black door is designed for larger Suburban replacements like your SW12DE. The cutout behind the door may need slight shimming, but the service door covers perfectly. If you’d prefer white, that’s the # FG58FR. Many RV owners make this swap for the endless hot water, so you don't have to wait for the tanked units to heat up. Most people go with these now days since they are a better technology and much more efficient as well. Have...
    view full answer...

Do you have a question about this RV Water Heater?


Info for this part was:

Employee Dustin K
Video Edited:
Dustin K
Employee Amanda M
Edited by:
Amanda M
Employee Michael B
Updated by:
Michael B
Employee Andy C
Installed by:
Andy C
Employee Cody B
Written by:
Cody B

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