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  1. RV Water Heater
  2. Fogatti
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  5. 14-5/16L x 18W x 15D Inch
  6. 40001 - 55000 Btu
Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 15"x18" White Door
Fogatti

Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 15"x18" White Door

Part Number: FG86FR
In Stock
$619.99
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 6-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 - 15"x18" White Door part number FG86FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Fogatti RV Water Heater - FG86FR

  • Tankless Water Heater
  • Gas
  • Fogatti
  • 14-5/16L x 18W x 15D 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 6-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 6-gallon tank water heater with a 15" 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 15" 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 - 15"x18" White Door

Installation Details FG86FR 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 6-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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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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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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See what our Experts say about this Fogatti RV Water Heater

  • Fogatti InstaShower With 15" x 18" Door To Replace Atwood GC6AA-10E
    Hey Kirk! The Fogatti InstaShower # FG86FR you were looking at comes with a 15" x 18" white door designed to match the old Atwood and others like it. There are no special instructions or parts to specifically replace the Atwood, you will follow the standard instructions. It looks like the link is broken on our site since they changed where they're hosting the instructions but you can find them here: https://drive.google.com/file/d/1cnxx0pD2uthc_CxW1JJMn345C50puRTn/view
    view full answer...
  • 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...
  • My Fogatti InstaShower 8 Plus RV Tankless Water Heater Won't Fire Up, Need Troubleshooting
    Hello Kevin, I thought it was fixed, I am very sorry to hear that you are still having issues. Since your Fogatti 8 Plus like # FG86FR will not fire and the induced draft motor is not coming on, the heater is stopping very early in the ignition sequence. This typically indicates a power, control, or safety interlock issue rather than a propane supply problem. The induced draft motor and control board both operate on 12-volt DC power, so the first thing to verify is that your RV battery...
    view full answer...
  • Does Fogatti InstaShower Tankless Water Heater Have Freeze Protection Or Does It Need Winterized?
    Stephanie, the Fogatti # FG26FR w/ black door (or # FG86FR w/ white door) does have an antifreeze cycle built in; when temps to about 43°F, it will fire briefly to keep the water lines from freezing, then shut off when temps rise back near 90°F. That’s great for overnight dips if you leave the RV powered. For long-term winter storage, you’ll still want to drain the unit. Do you typically camp in freezing weather, or just store the RV over winter? That will tell us what you need to do.
    view full answer...
  • How Does Fogatti InstaShower 8 Tankless Water Heater Compare To Furrion Tankless Water Heater RV?
    Melanie, the Fogatti # FG26FR black door version and # FG86FR in white door version puts out 55,000 BTU with about 2.9 GPM, while the Furrion # FR48SR runs at 60,000 BTU but closer to 2.4 GPM. So Fogatti tends to deliver steadier flow at the shower, while Furrion is a little hotter on max output. Both cover the 15×18 cutout, and either one is a huge upgrade from a tank model. If you've never used tankless, you'll wonder why you didn't do it sooner (more efficient, endless hot water, etc.) Do...
    view full answer...
  • Replacing Atwood 10gal Water Heater With 15x18 Door With Tankless Unit 2018 Winnebago Minnie Winnie
    Dan, the # FG26FR with the 15×18 black door is designed to cover the same space as your Atwood 10-gallon service door. It usually installs with only minor adjustments. Depending on framing, you may need to shim or trim the cutout. This requires cutout of 13" wide x 13" tall x 13-13/16" deep. The white version is # FG86FR if you’d rather match a white panel on the outside of the RV. Have you already pulled your Atwood out to check the framing, or do you want tips on what to measure before...
    view full answer...
  • Does Fogatti InstaShower RV Tankless Water Heater Include Relief Valve or Temp Sensor?
    Alan, the Fogatti Tankless Water Heater with black door # FG26FR does come with a temperature and pressure (T&P) relief valve right in the box, so you don’t need to pick one up separately. That valve is what protects against overpressure or overheating in the system. The # FG86FR white door version includes the same parts. Keep in mind, these units have the 15" tall and 18" wide service door, and require cutout dimensions of 13" wide x 13" tall x 13-13/16" deep. Do you plan to reuse...
    view full answer...
  • Does Fogatti InstaShower Tankless Water Heater For RVs Need Minimum Water Flow Or Pressure?
    Yes, Cheryl. The Fogatti InstaShower Tankless Water Heater for RVs and campers # FG26FR needs at least 1 gallon per minute of flow to ignite properly (from city water hookup, or from your rv tank). That’s about what you’d see at a bathroom sink or low-flow shower. Standard RV pumps provide plenty of flow at 40–55 PSI, so you should be ok unless your water pump is bad. As far as city water hookup goes, that's normally fine, but you can always add a regulator like # CAM40064 to make sure...
    view full answer...
  • Will Fogatti InstaShower 8 RV Water Heater Keep Up With Shower And Sink At Same Time In Camper?
    Emily, the # FG26FR black door model puts out up to 2.9 Gallons Per Minute at 55,000 BTU. That’s perfectly fine for one shower plus a faucet. You won't need to worry about that one bit! The # FG86FR white door model performs the same. Do you often run both showers at the same time, or is that just an occasional need? Also, keep in mind these units come with a 15" tall by 18" wide exterior service door, and the cut out dimensions are 13" wide x 13" tall x 13-13/16" deep. If you need a...
    view full answer...
  • Forest River Rockwood Suburban SW10 Water Heater Replacing With Tankless Fogatti Water Heater
    Carl, yes, the 15×18 black door on the # FG26FR is meant for covering similar footprint from a Suburban and Atwood 10-gallon like your SW10. Sometimes the cutout behind the door needs a bit of wood framing adjusted, since the Fogatti box is slightly different. The cutout dimensions it requires are as follows, so you may need to trim or shim (not always): 13" wide x 13" tall x 13-13/16" deep. You'll really enjoy the benefits of a tankless heater! Less water and power wasted, and you don't...
    view full answer...
  • Does Fogatti Tankless RV Water Heater Come With Wall Controller Or Does It Need That?
    Good question, Lucas. Yes, the # FG26FR includes the wired wall controller in the box. You can mount it in the bathroom, galley, or wherever’s handy. It lets you adjust temps from 95°–123°F and see error codes if anything’s off. The # FG86FR is the white door version and it includes the same controller. Also these units have the 18" wide and 15" tall door and have cut out dimensions of 13" wide x 13" tall x 13-13/16" deep. If you need different size of anything, you know where to find me...
    view full answer...
  • How To Wire In Fogatti InstaShower 8 Tankless RV Water Heater 12V
    Chris, for the Fogatti Water Heater # FG26FR with black door (or # FG86FR with white door), the black wire is positive +12V and the white wire is negative ground. The two blue wires connect to the wall controller, and polarity doesn’t matter on those. Make sure the heater is tied to a fused 12V supply - it draws around 4a when being used, or up to 10a at power spikes or startup. Let me know if you need any more assistance in any way!
    view full answer...
  • How Loud Is The New InstaShower Tanless Water Heater From Fogatti?
    Peter, the new tankless water heats from Fogatti like # FG26FR won't be completely silent, but it’s much quieter than most older Atwood or Suburban tank heaters. You’ll hear a soft whoosh and fan hum when it’s firing, but not the big roar of a tank burner. You'll still be able to carry on a normal conversation outside by the service door, where it's loudest. The # FG86FR white model is the same aside from the white door in case you want that instead. Do you plan to park close to neighbors...
    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 Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Amanda M
Edited by:
Amanda M
Employee Andy C
Installed by:
Andy C
Employee Cody B
Written by:
Cody B

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