Fogatti InstaShower 8 Plus (FS08B1SBD)
#15 in TanklessFull review
A tankless heater rated 55,000 BTU for endless hot water in an RV that has the cutout for it.
Amazon $519.99$519.99
The Fogatti InstaShower 8 Plus (FS08B1SBD) is the better RV water heater overall, rated 2.6 to 2.3. The Fogatti InstaShower 8 Plus (FS08B1SBD) leads on value. The Fogatti InstaShower 8 Plus (FS08B1SBD) costs $79.96 less ($519.99 vs $599.95).
Prices were last checked November 9, 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.
Girard 2GWHAM 42,000 BTU
#18 in TanklessFull review
A tankless heater rated 42,000 BTU for endless hot water in an RV that has the cutout for it.
Amazon $599.95$599.95
Which should you buy?
- Choose the Fogatti InstaShower 8 Plus (FS08B1SBD) for value ($9.45 per 1,000 BTU ($519.99, 55,000 BTU) vs $14.28 per 1,000 BTU ($599.95, 42,000 BTU)).
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 8 Plus (FS08B1SBD) | Girard 2GWHAM 42,000 BTU |
|---|---|---|
| Overall rating | 2.6/5 | 2.3/5 |
| Value 40% | 36 $9.45 per 1,000 BTU ($519.99, 55,000 BTU) | 13 $14.28 per 1,000 BTU ($599.95, 42,000 BTU) |
| Hot water output 35% | 47 up to 2.9 GPM | 50 maximum flow not published (neutral score used) |
| Warranty 25% | 0 warranty not published, scored as none | 0 1-year warranty |
Specifications
| Fogatti InstaShower 8 Plus (FS08B1SBD) | Girard 2GWHAM 42,000 BTU | |
|---|---|---|
| Heat and water | ||
| Input capacity | 55,000 BTU | 42,000 BTU |
| Maximum flow | 2.9 GPM | - |
| Fuel | Propane | Propane |
| 12 V amp draw | - | 3 A |
| Fit | ||
| Weight | - | 23 lb |
| Warranty | ||
| Warranty | - | 1 year |