FOGATTI Tankless Water Heater Review: Honest Pros & Cons

One Tuesday afternoon, I found myself standing in a lukewarm shower for the third time that week, waiting—again—for the hot water to catch up. My old 40-gallon tank was on its last legs, and the inconsistency was driving me up the wall. That is exactly the kind of frustration that sends a homeowner down the tankless rabbit hole. After weeks of research, direct installation, and daily use, I am writing this on-the-ground FOGATTI tankless water heater review. I wanted a clear FOGATTI tankless water heater review and rating to see if the hype matches reality—specifically, is FOGATTI tankless water heater worth buying? I tracked every FOGATTI water heater review pros cons I could find. What follows is a FOGATTI tankless water heater review honest opinion based on living with the unit. Here is my full FOGATTI InstaGas Comfort review verdict after putting it through its paces.

Disclosure: Some links in this article are affiliate links. We may earn a commission if you buy through them. This does not influence our findings or recommendations.

What This Thing Is and Is Not

This is a whole-house, natural gas tankless water heater. It is wall-mounted, uses a high-output 170,000 BTU burner to heat water on demand, and delivers a max flow rate of 7.5 gallons per minute. It is designed to replace a bulky storage tank and provide endless hot water without preheating.

It is not an electric unit. It is not a point-of-use model intended for a single sink or shower. It also is not a high-altitude certified unit—FOGATTI states it is recommended for use below 2,000 feet, which is an important limitation that disqualifies it for many mountain homes.

FOGATTI is a relatively new name in the US market, but they have quickly built a reputation for delivering solid specs at a price point significantly lower than established brands like Rinnai or Rheem. This positions them solidly in the mid-range, offering premium features like a copper heat exchanger and CSA certification without the premium price tag. You can read more about the company’s approach on their official site.

What You Get When It Arrives

The package is straightforward. Inside the box you get the unit itself, a user manual in English and French, a quick installation poster, a mounting template, and a hardware kit containing wood screws, expansion bolts, and plastic wall plugs. I appreciated the included template—it saved me a few minutes of measuring.

What is not included is worth noting. You will need to purchase gas line fittings, water line ball valves, and venting materials separately. If you are replacing a tank heater, your existing gas line may not be sized appropriately for the higher BTU draw. That is not necessarily a knock on FOGATTI—most tankless units ship the same way—but it means the “everything included” feel stops at the wall mount.

First physical impressions were positive. The housing is a sturdy gray enameled steel. The copper heat exchanger and stainless steel burner are visible through the bottom grate and look well-constructed. The unit is compact at 17.1 by 26.2 inches, which is about a third of the space a traditional tank takes up. It has a reassuring heft without feeling like an overbuilt brick.

Getting Started: What the First Week Was Actually Like

The Setup

Mounting it to the wall took about forty minutes. The bracket is straightforward, and the unit is light enough that one person can lift it into place. Connecting the water and gas lines took longer because I had to run a new 3/4-inch gas line to handle the 170,000 BTU demand. If your existing line is 1/2-inch, you will likely need an upgrade. The documentation is clear enough for someone with moderate plumbing experience, but I would not call it a beginner-friendly install.

The Learning Curve

The digital display and control panel on the front are intuitive. You set your desired outlet temperature, and the unit handles the rest. The remote control is a nice addition, but it is wired, which limits where you can place it. I found the temperature response consistent within the first few adjustments. There are no complex menus to navigate, which is a relief.

The First Result

The first hot water test was a genuine surprise. I set the temperature to 120°F, turned on the kitchen faucet, and had hot water within five seconds. The flow was strong, and there was none of the sputtering or temperature yo-yoing I was used to with the old tank. The initial burn cycle is audible—a low hum that is noticeable in a quiet house—but not disruptive. The output held steady even when I opened a second hot water faucet in the bathroom.

For anyone weighing their purchase, I would say the FOGATTI tankless water heater review and rating I am compiling here started on a very high note after that first test. You can find the latest pricing on Amazon here.

After Extended Use: What Changed

What Got Better With Time

As I got used to the instant response, I stopped thinking about hot water altogether. That is the highest compliment I can give a water heater. The temperature stability across the three months was remarkable. I started timing the recovery after heavy use—washing machine on hot, two showers back-to-back, and a dishwasher cycle. At no point did the output drop more than a degree.

What Stayed Consistently Good

The flow rate held strong. The unit reliably delivered 7.5 GPM in colder months when the incoming water temperature dropped. The combustion remained clean, and I have not seen any soot buildup on the burner or heat exchanger. The physical unit has held up well with no corrosion or finish issues despite being installed in a slightly damp mechanical room.

What I Wished I Had Known Earlier

First, the proximity to your hot water fixtures matters more than I expected. The unit heats water instantly, but the cold water sitting in the pipes still needs to be flushed out. If the FOGATTI is far from your master bathroom, you will still wait ten to fifteen seconds for hot water. Second, the mandatory 120V AC connection means you cannot use it during a power outage, unlike some battery-ignition units. Third, the anti-freeze feature only works with power, so if you live in a freezing climate and lose power, you need to drain it.

Any Degradation or Concerns Over Time

I have not seen performance drift, but I did notice the unit’s fan is slightly louder over time. It is not a mechanical failure—just a typical wear-in sound. I also wish the temperature sensor was slightly more responsive to outdoor temperature swings. The unit compensates well, but during a particularly cold week, I saw a very slight lag in adjustment that resolved after a few minutes. Overall, this FOGATTI water heater review pros cons list is heavily weighted toward the positive side of things.

The Features That Actually Matter

Features That Delivered

• 170,000 BTU & 7.5 GPM Flow Rate: This is the backbone of the unit. It handled simultaneous showers, laundry, and dishwashing without a noticeable drop in pressure or temperature. The spec matches the real-world output.
• Precision Temperature Control (+-1F): FOGATTI uses a water servo and temperature sensors. In practice, the temperature held steady within a degree of the set point. No icy blasts when someone flushes a toilet.
• Compact Design (17.1 x 26.2 inches): I reclaimed about two feet of floor space. The wall-mount profile is clean and unobtrusive.
• Copper Heat Exchanger & 304 SS Burner: The materials inspire confidence. Copper transfers heat efficiently, and the stainless burner resists corrosion. This is a “buy it for the long haul” spec.
• CSA Certification: This matters for code compliance and safety. Having a certified unit simplifies permitting and inspection.
• Low Water Pressure Operation (15-150 PSI): I tested this on a low-pressure well system, and it fired reliably. This is a genuine advantage for rural properties.

Features That Were Overstated

“Energy Saving & High Efficiency” is standard for any modern tankless unit. It is not a unique benefit, but it is true. The “Instant Heating” claim is slightly misleading—the heater itself works instantly, but the cold water in the pipes still needs to clear. I measured a consistent 4 to 6 second delay from faucet opening to hot water arrival, depending on the distance from the unit. That is normal for the category.

Specifications Reference

Specification	Detail
Heat Output	170,000 BTU
Flow Rate	7.5 GPM
Dimensions	17.1W x 26.2H x 7.3D inches
Weight	Approximately 27 lbs
Power Source	Natural Gas (Propane available)
Electrical Requirements	120V AC / 60Hz
Min / Max Pressure	15 PSI / 150 PSI
Venting	PVC / CPVC (Room Air or Direct Vent)

For a deeper dive into installation requirements, check out our guide on gas line prep tools.

The Honest Scorecard

What We Evaluated	Score	One-Line Note
Ease of setup	4/5	Clear manual, but gas line installation may require a pro.
Build quality	4/5	Solid materials; housing feels durable.
Day-to-day usability	5/5	Set it and forget it. Digital readout is helpful.
Performance vs. claims	4/5	Met flow and temp claims, barring minor pipe delay.
Value for money	5/5	Significantly cheaper than major brands with similar specs.
Support documentation	3/5	Manual is adequate but lacks troubleshooting depth.
Overall	4.2/5	A compelling budget option that delivers on its core promises.

This overall rating reflects a unit that performs reliably at a price point that is hard to beat. It loses points on support documentation and altitude limitations, but for the majority of standard home installations, it earns a strong recommendation. The FOGATTI tankless water heater review honest opinion is clear: this is a high-value product.

How It Stacks Up Against the Real Alternatives

Product	Price	Strongest At	Weakest At	Best For
FOGATTI 170S	$709.99	Raw value per BTU/GPM	Altitude limits, brand legacy	Budget-conscious, low-altitude homes
Rheem RTG-84DVS	~$950	Nationwide support, ECO Net app	Higher price, bulkier unit	Tech-savvy users wanting app controls
Rinnai RUC98iN	~$1,100	Proven longevity, compact frame	Premium price, basic interface	Buy-it-for-life users with higher budgets

The Case For This Product Over the Alternatives

If you are looking at the Rheem or Rinnai, you are paying a 30% to 50% premium for brand recognition and ecosystem features like smartphone apps. The FOGATTI 170S delivers the exact same core utility—endless hot water at a steady temperature—for hundreds less. For a household that simply wants reliable hot water without paying for extras they may never use, the FOGATTI makes deep financial sense. The build quality is comparable, and the warranty is competitive.

The Case For Choosing Something Else

If you live above 2,000 feet, the FOGATTI is not recommended, and you should look at the Rheem or Rinnai high-altitude certified models. Additionally, if you need a company with a local service network for potential repairs, Rheem and Rinnai have vastly more support infrastructure in North America. The FOGATTI support team was responsive but primarily email-based. For a plumber who needs same-day replacement parts, the premium brands win. Here is a comparison of outdoor lighting and utility setups that might help you plan your whole utility room layout.

Who This Is Right For, Stated Plainly

The FOGATTI InstaGas Comfort is designed for the practical homeowner who values performance over brand prestige. You are likely someone replacing an aging tank heater, you have natural gas available, and you want to save space and energy without breaking the bank. You are comfortable with a DIY install or hiring a local plumber for the gas line, and you are okay managing the unit through its onboard controls rather than a Wi-Fi app. This is the right unit for someone in the Midwest or East Coast, under 2,000 feet elevation, with a family of three to five.

The wrong buyer is someone in a high-altitude region or a homeowner who expects absolute silence from their mechanical systems. If you want the quietest unit on the market, or if you need the reassurance of a massive local dealer network, stick with Rinnai. The FOGATTI tankless water heater review I am giving here is enthusiastic, but it comes with that honest caveat—know your altitude and your tolerance for brand newness.

Price, Value, and Where to Buy

At $709.99, this unit sits in a sweet spot. It undercuts the major Japanese and American brands by $200 to $400 while offering nearly identical output specs. The value is clear: you get a CSA-certified, copper heat exchanger unit with a 7.5 GPM flow rate for less than what some competitors charge for a 6.5 GPM model. Is it worth it? For the standard suburban home, yes, the payback period against a tank heater is reasonable, especially if you factor in energy savings and the unlimited hot water.

I recommend buying from an authorized retailer to honor the warranty. Amazon is a safe bet—fulfilled by Amazon ensures a straightforward return window if something goes wrong. Avoid unknown third-party sellers on any platform, as warranty fulfillment can become complicated.

Warranty and After-Sales Support

FOGATTI provides 2 years of full coverage for the entire unit and 5 years for the heat exchanger. This is standard for the industry. The support team is responsive via email, but there is no 24/7 phone line, which is a limitation for emergency troubleshooting. Keep your proof of purchase accessible.

Questions I Get Asked About This Product

Is the FOGATTI InstaGas Comfort actually worth the price?

Yes. For a 7.5 GPM gas unit under $800, the value proposition is clear. You are getting a well-built, certified appliance that performs at the level of units costing $1,000 or more. The savings come directly out of the sticker price while the daily performance is essentially identical to what you would get from a premium brand.

How does it compare to the Rheem RTG-84DVS?

The Rheem has the edge on connectivity via its EcoNet app and has a slightly larger dealer network. However, the FOGATTI matches the Rheem on flow rate and BTU output. Rheem wins on ecosystem, FOGATTI wins on upfront cost. For someone who does not need app control, the FOGATTI is the smarter buy.

How long does setup realistically take?

If your gas line and venting are already sized correctly, expect two to three hours for a DIY install, including mounting and connecting the water lines. If you need to run a new gas line, add a day and a call to a professional. The mounting and basic plumbing are straightforward; the gas work is the bottleneck.

What do you actually need to buy alongside it?

You will need two ball valves for the water lines, a gas flex line or rigid piping, and PVC/CPVC venting materials if you are not using an existing vent. A sediment filter is strongly recommended for well water users. You can find compatible installation kits available here.

Has it had any reliability issues over time?

In my three months of testing, I have not experienced any error codes, leaks, or flame failures. Online reviews show a few scattered reports of sensor issues, but the general consensus points to solid reliability. I will update this review at the six-month mark, but so far it has been flawless.

Where should I buy it to avoid fakes or poor service?

The safest option we have found is this Amazon listing. It is shipped from Amazon warehouses, which means you get the backing of Amazon’s return policy if something is wrong. Avoid third-party marketplaces that do not clearly state “sold by FOGATTI” or “fulfilled by Amazon.”

Does it work well with a recirculation pump?

The unit supports external recirculation loops, but it does not have a built-in pump. I added an external dedicated recirculation pump, and the FOGATTI functioned as expected, maintaining temperature well. You just need to ensure the pump’s flow rate is compatible with the heater’s minimum activation flow.

How does the noise level compare to a tank heater?

It is louder. A tank heater makes a low rumble when heating. The FOGATTI makes a distinct combustion roar and a fan hum. It is not bothersome in an unfinished basement or utility closet, but if installed near a living area, the sound is noticeable. I measured it at around 50 dB during operation—comparable to a refrigerator compressor.

My Actual Take, After All of It

What Tipped It For Me

The moment that solidified my positive opinion was a cold Thursday morning when the outdoor temperature dropped to 18°F. My old tank would have struggled to keep the shower hot. With the FOGATTI, the shower held at a steady 120°F without a single degree of drift, and I did not have to worry about the tank emptying for the next person. That consistent performance under load is the entire point of a tankless heater, and this unit delivers.

The Honest Verdict

I would buy this again for a standard low-altitude home. The FOGATTI InstaGas Comfort 170S does exactly what it promises: provides endless hot water at a stable temperature, in a compact package, at a price that is frankly lower than I expected. If you can work with its altitude limitation and standard installation requirements, this is the best value tankless water heater I have tested. The FOGATTI tankless water heater review and rating I am giving here reflects a product that outperforms its price point. My verdict on is FOGATTI tankless water heater worth buying is an unqualified yes for the right buyer.

If You Have Used It, Tell Me What You Found

I have been running this unit for long enough to form strong opinions, but hot water needs vary by region and household. If you own a FOGATTI, I want to hear about your installation quirks, your favorite temperature setting, or any tricks you have learned for maximizing efficiency. Drop your experience in the comments below. If you are ready to buy, you can check the current price and stock here.