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

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

Part Number: FG66FR
$599.99
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 your old tank or tankless heater. Great Prices for the best rv water heater from Fogatti. Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 15" x 15" Door part number FG66FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (9)
  • Q & A (0)
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Fogatti RV Water Heater - FG66FR

  • Tankless Water Heater
  • Propane
  • White Door
  • Fogatti
  • 14-5/16L x 15W x 15D Inch
  • 40001 - 55000 Btu
  • 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 your old tank or tankless 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
  • Standard size hinged door with flat lock provides easy access for cleaning or maintenance
    • Larger sizes available when replacing a tank water heater with bigger 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
  • Designed as a tank-to-tankless conversion that fits a 13" x 13" cutout
  • Operates on 12V DC power for ignition and system control


Specs:

  • Overall dimensions: 14-5/16" long x 15" wide x 15" tall
    • Cutout 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
  • Water connection size: 1/2" NPT
  • Gas connection size: 5/8" UNF (LPG)
  • 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"x15" White Door

Installation Details FG66FR Installation instructions


California residents: click here


Ratings & Reviews

4.9

9 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 your old tank or tankless heater.

by:

excellent service as always never disappointed with etrailer have not installed yet but i believe it will be ok

Mike L. profile picture
Etrailer Expert

Mike L.

4/24/2026

Thank you, Mark! Please let us know how the install goes and how you like the water heater once you've lived with it for awhile....



by:

Replaced our 12 gallon water tank with this unit. Directions for install were good. The unit itself seemed well built and I had no issues with the install. This will be our 2nd summer with this unit. If I had to guess I would say just last year alone we used it for 6 weeks.



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Priced right and delivered quick!



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9
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See what our Experts say about this Fogatti RV Water Heater

  • Will the Fogatti InstaShower 8 Plus RV Tankless Water Heater Replace My Old Suburban Water Heater?
    Hello Norm, Making the swap to a tankless water heater. You will not be disappointed. Based on the dimensions you provided, the Fogatti InstaShower 8 Plus RV Tankless Water Heater - 55,000 Btu - 15"x15" White Door # FG66FR will be a great swap for you. The # FG66FR needs a cutout of 13" wide x 13" tall x 13-13/16" deep, and with the included 15" by 15" door is exactly what is needed to cover the hole. So yes, you are correct! 3 words everyone loves to hear. Were you able to get...
    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...
  • What All Is Needed To Find And Install The Correct Tankless Water Heater In 2008 Flagstaff Camper?
    Hello Tammy, I can help you out! Do you know the size of your cutout space for the heater, and the size of your existing water heater door on the outside of the travel trailer? That way we can match one up without requiring you to modify it at all hopefully! I highly recommend something from Furrion due to very good quality. The Furrion RV Tankless Water Heater - Gas - Automatic Pilot - 60,000 BTU - 16" x 16" Door # FR98SR is a solid option which has the following dimensions: Access door:...
    view full answer...
  • Replacing Atwood RV Water Heater With Tankless Option For Casita Spirit Deluxe Travel Trailer
    Evan, many Casita owners upgrade to a modern tankless water heater like the Fogatti # FG76FR. The 15"×15" door covers the Atwood 6-gallon cutout nicely, though you might need to tweak the box opening a touch. Performance-wise, you’ll appreciate how the Fogatti holds steady temps at low flow - no more icy blasts mid-shower. Casita’s small gray tank means shorter showers anyway, so tankless really shines. And if you prefer white trim, the # FG66FR is your option. Are you planning to do...
    view full answer...
  • Comparing Girard Tankless Water Heater To Fogatti 55k Btu Tankless Water Heater For RVS
    Nate, both brands are solid, but the Fogatti # FG76FR with black door and # FG66FR in white puts out a higher BTU - 55,000 vs Girard’s typical 42,000. That gives Fogatti more stability when two people are using water at once. Plus, customers often say Fogatti’s controller makes fine-tuning temps easier. The cutout fit can still require a little trim either way. What type of camper is this going in?
    view full answer...
  • Replacing Suburban SW6DE Water Heater 2004 Jayco Eagle With Fogatti Tankless Water Heater
    Mark, good question. The # FG76FR 15" × 15" black door is often used as a direct replacement for Suburban 6-gallon models like your SW6DE. The door covers that opening well, but the box behind it is a little different in depth and flange. You may have to trim or shim the cutout slightly - Fogatti unit needs cutout of 13" wide x 13" tall x 13-13/16" deep. The white version is # FG66FR if that’s a better look for your camper exterior. Either way, once installed, you’ll gain the endless hot...
    view full answer...
  • Will Fogatti InstaShower 8 Plus RV Tankless Water Heater Run Off Single 20lb Propane Tank?
    Dakota, the Fogatti # FG76FR draws about 55,000 BTU at full fire, so a single 20-lb propane cylinder can absolutely run it. You’ll just go through fuel quicker than a 2-bottle setup, especially if you’re boondocking and using hot showers daily. But you should still have a good 7-8 hours of shower use depending on a lot of variables like temperature of water, if other gas accessories are being used etc. The twin cylinder setup is nice because you can swap one at a time. The # FG66FR is the...
    view full answer...
  • What Water Pressure Range Does Fogatti Tankless Water Heater FG76FR Need? 12v Pump Fine?
    Luis, the Fogatti # FG76FR runs water pressure of 14.5-116 PSI, with preferred pressure: 40-45 PSI, so it works great with a standard 12V RV pump usually around 40–60 PSI. Flow rate needs to be at least 1 gallon per minute to ignite. If your pump surges or is undersized, you might see temperature swings. The # FG66FR white version is identical inside. Do you already have a pressure regulator on your city water inlet? That’s a good idea to protect the whole RV plumbing system. If you don't...
    view full answer...
  • Does Fogatti InstaShower RV Water Heater Have Built-In Freeze Protection For Cold Winter Camping?
    Jenna, you’ll like this - the # FG76FR has an automatic antifreeze cycle that kicks in when temps drop near 43°F. It’ll fire briefly to keep water lines from freezing, as long as propane and 12V are supplied. That said, for long winter storage, draining is still recommended but at least you won't have to worry when consistently using it during the cold months. The white-door model # FG66FR has the same feature. Since you camp in real cold, do you keep your rig heated all winter, or does...
    view full answer...
  • Does Fogatti InstaShower RV Tankless Water Heater Come With Controller?
    Pat, the # FG76FR comes with the wired digital controller in the box - it’s not an add-on. That lets you set water temps anywhere from 95°–123°F, switch between °C/°F, and see error codes if anything pops up. You can mount it in the bathroom or kitchen for easy access. The white-door version is # FG66FR, same package. Have you thought where you’d mount the controller in your Jayco? For anyone else reading, where have you found the most convenient spot?
    view full answer...
  • Is Everything Included For Installation With Fogatti 55K Btu RV Water Heater FG76FR ?
    Chris, the # FG76FR includes the heater, door, controller, and install kit, but you’ll still need a gas regulator, Teflon tape, and maybe other fittings depending on your existing plumbing. The door size matches Suburban/Atwood 6-gallon service doors, but behind it you may need to adjust the opening. The # FG66FR white version has the same inclusions. Do you plan to do the swap yourself or have a shop handle the propane hookup?
    view full answer...
  • Recommended Tankless Water Heater For Small Class B Van - Dishes And Shower
    Alan, the 55,000 BTU # FG76FR tankless water heater will actually work fine in a van. Its microcomputer control scales the flame down when you’re running just a trickle at the sink, so you won’t waste fuel. Max capacity is 2.9 GPM, but it doesn’t “over-fire” if you don’t need that much. Sidenote: if you’d rather match the door to white paint, # FG66FR is the version. Have you already got a service door cutout in your van, or would this be a fresh install? Other van folks here - do you...
    view full answer...
  • How Steady Is Hot Water Temperature On Fogatti Tankless RV Water Heater When Someone Flushes?
    Stephanie, that’s where the Fogatti # FG76FR really shines. It uses a digital microprocessor to keep water temp stable, even with flow changes. So when someone flushes or the pump kicks, you won’t get those wild hot-cold swings like the older tankless models are known for. The # FG66FR white version works the same. Are you usually camping solo, or do you have kids onboard who are likely to run taps while you’re showering?
    view full answer...

Do you have a question about this RV Water Heater?


Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Matthew S
Updated by:
Matthew S
Employee Alex H
Updated by:
Alex H
Employee Michael B
Updated by:
Michael B
Employee Amanda M
Edited by:
Amanda M
Employee Andy C
Installed by:
Andy C
Employee Thomas T
Video by:
Thomas T
Employee Cody B
Written by:
Cody B

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