Fogatti InstaShower Ultra (FS10B1SGD)
#10 in TanklessFull review
A tankless heater rated 66,000 BTU for endless hot water in an RV that has the cutout for it.
Amazon $799.99$799.99
The Fogatti InstaShower Ultra (FS10B1SGD) is the better RV water heater overall, rated 3.0 to 2.9. The Fogatti InstaShower Ultra (FS10B1SGD) leads on hot water output. The Fogatti InstaShower 9 Pro (FS10B1S) costs $60 less ($739.99 vs $799.99).
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Fogatti InstaShower 9 Pro (FS10B1S)
#11 in TanklessFull review
A tankless heater rated 66,000 BTU for endless hot water in an RV that has the cutout for it.
Amazon $739.99$739.99
Which should you buy?
- Choose the Fogatti InstaShower Ultra (FS10B1SGD) for hot water output (up to 3.9 GPM vs up to 3.6 GPM).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every tankless RV water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fogatti InstaShower Ultra (FS10B1SGD) | Fogatti InstaShower 9 Pro (FS10B1S) |
|---|---|---|
| Overall rating | 3.0/5 | 2.9/5 |
| Value 40% | 22 $12.12 per 1,000 BTU ($799.99, 66,000 BTU) | 26 $11.21 per 1,000 BTU ($739.99, 66,000 BTU) |
| Hot water output 35% | 100 up to 3.9 GPM | 84 up to 3.6 GPM |
| Warranty 25% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Fogatti InstaShower Ultra (FS10B1SGD) | Fogatti InstaShower 9 Pro (FS10B1S) | |
|---|---|---|
| Heat and water | ||
| Input capacity | 66,000 BTU | 66,000 BTU |
| Maximum flow | 3.9 GPM | 3.6 GPM |
| Fuel | Propane | Propane |
| Fit | ||
| Weight | - | 30.9 lb |