Last updated: August 14, 2026
The Fogatti RV tankless water heater is the product that turned on demand hot water from a specialist upgrade into something ordinary owners actually fit. Fogatti’s contribution was not a technical breakthrough. It was recognizing that the barrier had always been the hole in the sidewall, and building units around the openings that existing tank heaters leave behind, complete with a matching exterior door.
That is the right lens for judging it. Fogatti is not competing on engineering pedigree, it is competing with the six gallon tank already in your wall, on the basis that swapping one for the other is a Saturday morning rather than a bodywork project. This review covers how well that holds up, where the complaints cluster, and who should buy something else.
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Quick Answer
Is a Fogatti RV tankless water heater worth buying?
- Yes for most owners replacing a standard tank heater, because the unit and its door are designed around that opening and the swap is genuinely straightforward.
- Buy the size that matches your existing opening, not the largest one. Fogatti sells more than one footprint and the wrong choice turns a swap into carpentry.
- Expect a learning curve with the temperature panel and the flow behavior. Most early complaints are settings and plumbing rather than the appliance.
- The gas connection is work for a certified RV technician. Fit a carbon monoxide alarm and check the expiry date on the back of it.
Fogatti at a Glance
Here is what the product is and what it is not, before any judgment about whether it suits your rig. Check every dimension against the listing for the exact model you are considering, since Fogatti offers the same idea in more than one size.
| Aspect | What it is |
|---|---|
| Format | Propane on demand water heater built to replace a tank heater in the existing wall opening |
| Best known line | The InstaShower series, sold in several sizes and trim variations |
| Fitment approach | Sized around common RV tank footprints, with a matched exterior door and flange |
| Controls | Interior panel with a temperature setpoint on most models, check the listing |
| Power needed | 12 volt for ignition, controls and the combustion fan |
| Output | Published as a flow figure at a stated temperature rise, which varies by model |
| Installation | Mechanical fit is owner friendly, the gas connection is technician work |
| Not designed for | Running without 12 volt power, or dropping into an opening it was not sized for |
Our assessment rests on published manufacturer specifications and the patterns that repeat across owner feedback rather than on any trial of our own. That matters most for the reliability question, where individual reports vary widely and only the repeating themes are worth anything.
What It Gets Right
Fitment is the achievement. Owners consistently report that the unit went into the opening the old heater came out of, that the supplied door closed the hole properly, and that the plumbing connections landed close to where the old ones were. Each of those is a place where a generic tankless unit costs you a weekend, and removing all three is why this brand took the market it did.
The interior control panel is the second strength. Tank heaters trained owners to accept whatever came out, and a setpoint you can nudge from the bathroom gets mentioned in almost every positive owner report. Availability helps too: parts, doors and whole units are easy to find, which is not true of every brand here and matters when something fails before a trip.
Where It Falls Short
The complaints cluster in three places, and only one is really about the appliance. First, temperature stability at low flow: like every on demand heater it needs a minimum rate of water movement to keep the burner lit, and RV plumbing runs close to that line, so owners who throttle the shower get cold slugs partway through. Second, the water system behind it. A tankless heater exposes a tired pump or an air leak in a way a tank heater never did, because the tank absorbed the variation. Fix that first with our water pump repair guide.
Documentation is the real weak point
Owners report thin troubleshooting sections, error codes documented briefly if at all, and support that varies by where the unit was bought. Irrelevant on an install that never misbehaves, and exactly what you do not have when a fault is intermittent two states from home. Keep the manual, photograph the model plate, and note any error code the first time it appears.
Check It Out
If the format suits you, this is what to buy and the one thing to get right at the point of ordering.
🏆 The One Most Owners Should Buy
A Fogatti propane RV tankless water heater in the size that matches your existing wall opening, supplied with its exterior door and the interior control panel. Measure the height, width and depth of the finished opening before ordering and compare against the dimensions on the listing, because Fogatti sells more than one footprint and the larger one is not automatically better. Buying the matching size is what makes this a swap instead of a rebuild.
Who It Is For, and Who Should Skip It
The decision is mostly about what is already in your wall and how you shower, and only slightly about the brand.
- Buy it if you are replacing a standard tank heater and want the swap to be an afternoon rather than a project.
- Buy it if your household showers back to back and the six gallon tank is the thing everyone plans around.
- Buy it if you camp at mixed sites, since propane works with or without a pedestal, unlike the electric alternatives.
- Skip it if your water pump already cycles or your pressure swings, because a tankless heater amplifies that rather than masking it.
- Skip it if you camp a few weekends a year and the current tank heater works.
- Skip it if you need documented error codes and a dealer network, where Suburban and Girard are the conservative choices.
What to Pair It With
One of these is not optional in any rig with a propane appliance, and the other is what keeps output where it started.
🚨 Buy This Regardless
An RV carbon monoxide alarm with a visible expiry date printed on the housing. Sensors expire, and plenty of rigs run alarms that stopped being reliable years ago. Any appliance that burns propane belongs in a rig with a current alarm, and checking the date takes ten seconds when the box arrives. A combination carbon monoxide and propane alarm covers both risks in one unit.
🧪 The Seasonal Job That Preserves Output
A descaling kit with a circulation pump, hoses, a bucket and a food safe solution. Hard water scales the narrow passages of the heat exchanger, which shows first as reduced flow and temperature swing. A seasonal descale restores it, and the procedure is in our descaling guide.
Installation and the Line We Do Not Cross
The mechanical side is owner work: drain and isolate, remove the door and flange, unbolt the old heater, offer up and seal the new one, connect the fresh water lines. That is the part Fogatti made easy, and there is no reason to pay someone for it if you are comfortable with tools.
The gas connection is different, and we do not publish instructions for it. Gas lines, regulators, gas valves, burner tubes, orifices and burner adjustment are work for a certified RV technician, because a joint that looks correct can leak slowly, propane collects in the low parts of a rig, and proving a joint takes a proper leak test rather than a look and a sniff. Any 120 volt work is the same. If you smell gas, hear a carbon monoxide alarm, see soot, or see a yellow or lifting flame instead of a steady blue one, switch the appliance off, close the cylinder valve, ventilate, get everyone outside, and call a technician rather than relighting it.
Frequently Asked Questions
Will a Fogatti fit where my tank heater was? Usually, provided you order the size built for your opening. Measure the height, width and depth of the finished opening and compare against the listing first.
Does it need 12 volt power? Yes. Ignition, controls and the fan run from the rig’s battery, so a flat battery means no hot water even with a full propane cylinder.
Why does the water go cold mid shower? Usually the flow has dropped below the minimum needed to keep the burner lit. Open the tap wider and lower the setpoint at the panel instead of mixing in cold at the valve.
Is the exterior door included? On most listings yes, and it is what makes the swap tidy. Confirm it on the specific listing, since trim and door color vary.
Can I install it myself? The mechanical fit and the water connections are normal owner work. The gas connection is for a certified RV technician, and the system should be leak tested before use.
How does it compare to a tank heater? Continuous hot water instead of a fixed reserve, more sensitivity to flow, and no tank to drain. Our tankless versus tank comparison covers where each format wins.
The Bottom Line
Fogatti earns its position as the default RV tankless choice by solving the problem that actually stopped people, which was fitment rather than technology. Order the size that matches your opening, expect a short adjustment period with the panel, and sort out a tired water pump before blaming the heater. Its weak point is documentation rather than hardware, so keep the manual and note any error code. Do the mechanical work yourself, and give the gas connection to a certified RV technician.