Suburban ST-42 (5481A)
#14 in TanklessFull review
A tankless heater rated 42,000 BTU for endless hot water in an RV that has the cutout for it.
Amazon $404.99$404.99
The Suburban ST-42 (5481A) is the better RV water heater overall, rated 2.6 to 2.5. The Fogatti InstaShower 7 (FS07B1S) costs $5.06 less ($399.93 vs $404.99).
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 7 (FS07B1S)
#17 in TanklessFull review
A tankless heater for endless hot water in an RV that has the cutout for it.
Amazon $399.93$399.93
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 | Suburban ST-42 (5481A) | Fogatti InstaShower 7 (FS07B1S) |
|---|---|---|
| Overall rating | 2.6/5 | 2.5/5 |
| Value 40% | 35 $9.64 per 1,000 BTU ($404.99, 42,000 BTU) | 50 BTU rating not published (neutral score used) |
| Hot water output 35% | 50 maximum flow not published (neutral score used) | 26 up to 2.5 GPM |
| Warranty 25% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Suburban ST-42 (5481A) | Fogatti InstaShower 7 (FS07B1S) | |
|---|---|---|
| Heat and water | ||
| Input capacity | 42,000 BTU | - |
| Maximum flow | - | 2.5 GPM |
| Fuel | Propane | Propane |
| Fit | ||
| Weight | 21 lb | - |