Is Fogatti a good tankless water heater brand?

Fogatti is a reasonable budget pick with clear trade-offs. Its InstaGas home units cost $499-$766 at Home Depot, which undercuts comparable non-condensing Rinnai models by roughly $150, and its InstaShower RV heaters are among the most widely sold drop-in RV tankless units. The trade-offs are efficiency and warranty: the home units are non-condensing with a UEF above 0.81 (not ENERGY STAR territory), and Fogatti's own warranty page lists 24 months for gas tankless heaters with labor excluded, against 10-15 years of heat-exchanger coverage from Rinnai, Navien and Rheem.

How many GPM does a Fogatti tankless water heater really deliver?

Fogatti's own 2024 catalog rates every InstaGas model at a 35 degree F temperature rise: 5.45 GPM for the 120,000 BTU Classic 120, 8.17 GPM for the 170,000 BTU model and 8.85 GPM for the 180,000 BTU outdoor model. Retail listings round those down to 5.1, 7.5 and 8.1 GPM. Because heat output is fixed, flow falls in proportion to the rise, so at a 70 degree F northern-winter rise those become about 2.7, 4.1 and 4.4 GPM. That is roughly one shower on the Classic 120 and two on the 170.

What warranty does Fogatti offer on tankless water heaters?

Fogatti's own warranty page lists 24 months for its tankless gas water heaters and its RV tankless heaters, 12 months for its electric tankless heaters, and excludes all installation, removal and on-site repair labor. Warranty registration is required to activate coverage. Several Home Depot and Lowe's listings advertise 5 years on the heat exchanger and 2 years on other parts, but that split does not appear on Fogatti's warranty page, so get it confirmed in writing before you rely on it.

Can a Fogatti tankless water heater use my old water heater vent?

Fogatti's catalog says most tank water heaters' vent, water and gas pipes can be reused, and Home Depot lists a 3-inch power vent. Pipe diameter is not the issue, though. The InstaGas units are non-condensing, and non-condensing tankless heaters push exhaust above 300 degrees F under positive pressure, which is why major brands specify Category III stainless venting rather than the Category I B-vent an atmospheric tank uses. We could not find Fogatti's residential installation manual online, so have your installer confirm the required vent category before reusing an old flue.

Does Fogatti sell tankless water heaters on Amazon?

Fogatti's InstaShower RV heaters are widely listed on Amazon and on Fogatti's own store. The InstaGas home units sell mainly through Home Depot, Lowe's and Walmart, and Amazon availability for them comes and goes through third-party sellers. Match the full model number (for example 420IN-CS120-NG or FDG-CF170W-NG) before buying, because fuel type and indoor/outdoor versions use near-identical titles.

Fogatti Tankless Water Heater Review 2026: InstaGas Home Units, InstaShower RV Units, and the 24-Month Warranty

Quick Answer: Fogatti sells two unrelated tankless lines: InstaShower propane RV heaters and InstaGas non-condensing home heaters. For a house, the InstaGas Comfort CF170W (170,000 BTU, $669.99 at Home Depot) is the model to buy, and the 120,000 BTU Classic CS120 ($549.99) suits one bathroom in a warm climate. Fogatti’s own 2024 catalog rates the 170 at 8.17 GPM at a 35°F rise, which is about 4.1 GPM in a northern winter. Fogatti’s own warranty page lists 24 months for gas tankless heaters with labor excluded, compared with 10–15 years of heat-exchanger coverage from Rinnai and Navien.

Last updated October 28, 2026: prices checked against Home Depot and Fogatti’s own store. Specs come from Fogatti’s 2024 builder catalog and warranty terms from fogatti.com.

Most people who search “Fogatti tankless water heater” already know the name from an RV. Fogatti’s InstaShower drop-in units are what we recommend for most campers in our best RV tankless water heater guide. Fogatti also sells a full line of home gas tankless heaters at Home Depot and Lowe’s, priced well below Rinnai, Rheem and Navien. This page covers both lines, what you give up for the lower price, and which buyers should go ahead anyway.

Fogatti’s tankless lineup at a glance

Model	Line	Input	GPM (35°F rise, Fogatti catalog)	GPM (70°F rise, est.)	Install	Price
InstaGas Classic CS120 (420IN-CS120-NG)	Home	120,000 BTU	5.45	2.7	Indoor	$549.99 (Home Depot)
InstaGas Classic CS120S (420OD-CS120S-NG)	Home	120,000 BTU	5.45	2.7	Outdoor	$499.99 (Home Depot)
InstaGas Comfort CF170W (FDG-CF170W-NG)	Home	170,000 BTU	8.17	4.1	Indoor	$669.99 (Home Depot)
InstaGas Premium PM180SAW (FDG-PM180SAW-NG)	Home	180,000 BTU	8.85*	4.4	Outdoor	$766.29 NG / $669.99 LP (Home Depot)
InstaShower 8 Plus	RV	55,000 BTU	Up to 2.9	n/a	RV drop-in	$519.99 (fogatti.com)
InstaShower Ultra	RV	66,000 BTU	Up to 3.9	n/a	RV drop-in, mixing tank	$729.99 (fogatti.com)

*Fogatti's 2024 catalog lists its 180,000 BTU outdoor unit as the "InstaGas Comfort 180S." Home Depot's current 180,000 BTU outdoor listing uses the "InstaGas Premium PM180SAW" name with the same input rating. We treat them as the same platform, but Fogatti doesn't publicly confirm the rename. The 70°F-rise column scales Fogatti's own 35°F figure in proportion to the rise; burner output is fixed, so flow falls as the rise grows. Retail listings round the 35°F figures down to 5.1, 7.5 and 8.1 GPM.

By the numbers

35°F temperature rise: the condition behind every flow figure in Fogatti’s 2024 builder catalog (5.45 GPM for the Classic 120, 8.17 for the 170, 8.85 for the 180S). A 35°F rise means 85°F incoming water heated to 120°F, which is a southern-summer number. Source: Fogatti 2024 IBS catalog.
24 months: the warranty Fogatti’s own warranty page lists for “Tankless Hot Gas Water Heater,” the same as its RV tankless units. Installation, removal and on-site repair labor are excluded. Source: fogatti.com warranty page.
UEF above 0.81: Fogatti’s catalog efficiency for every InstaGas model, which puts them in non-condensing territory. ENERGY STAR’s own UEF explainer uses 0.93 as an example of a certified gas tankless unit. Sources: Fogatti catalog; ENERGY STAR.
2.5 GPM: the federal maximum flow for a showerhead (Energy Policy Act of 1992). EPA WaterSense-labeled heads run 2.0 GPM or less. At a 70°F rise, the Classic CS120’s roughly 2.7 GPM covers one standard shower. Sources: DOE; EPA WaterSense.

Who Fogatti actually is

Fogatti Inc. is based in Elkhart, Indiana, the center of the US RV industry, and its own site calls it a “trusted OEM supplier to leading RV brands.” Its 2024 builder catalog describes the wider Fogatti Group as founded in 2003, selling in more than 50 countries, and the number-one water-heater exporter in China according to 2017 Chinese customs data (the company’s own claim).

Three details from that catalog matter if you’re shopping the brand:

Mizudo is a sister badge. The catalog’s Mizudo gas tankless pages list a “Classic” series (80,000–199,000 BTU), the same Classic name Home Depot sells under the Fogatti badge, with the same 0.55–0.66 GPM activation flow, UEF, oxygen-free copper heat exchanger and dimensions as the Fogatti-branded InstaGas Comfort pages. Zoro sells a MIZUDO-branded 170,000 BTU indoor heater under model FDG-CF170AW-NG, the same FDG-CF170 stem Home Depot uses for the Fogatti CF170W. If one badge is cheaper on the day, you’re probably looking at the same heater.
Fogatti builds for other brands. Our Westinghouse tankless review found a retailer listing naming Fogatti as the maker of the Westinghouse Apolo electric line. That’s the same pattern as Richmond units built by Rheem, just at the budget end of the market.
The home line is non-condensing. Every InstaGas model is rated at a UEF above 0.81 (EF above 84% in Canada), with a copper heat exchanger and a 3/4-inch NPT gas inlet. That’s the same efficiency class as Rinnai’s V-series, not the 0.93–0.98 condensing units at the top of our best gas tankless water heater list.

1. Fogatti InstaGas Comfort CF170W: Best Fogatti for a Whole Home

Fogatti InstaGas Comfort CF170W Indoor Gas Tankless Water Heater (FDG-CF170W-NG / -LP)

170,000 BTU · 8.17 GPM at 35°F rise (7.5 GPM on retail listings) · about 4.1 GPM at 70°F rise · indoor · UEF >0.81 · $669.99 at Home Depot

The largest indoor unit Fogatti sells through US home centers. It's 26.2 × 17.1 × 7.3 inches and weighs 40.8 lb according to Fogatti's catalog, about a third of the footprint of a 50-gallon tank.
At a 70°F winter rise it delivers about 4.1 GPM, which covers two WaterSense showers at once, or one shower plus a kitchen tap. That's realistic for a two-bathroom home in most of the country.
Natural gas needs at least 3.5 inches of water column supply pressure and propane at least 8.0 inches, per the catalog. A 170,000 BTU burner often outgrows the 1/2-inch line that fed an old tank, so check our gas line sizing guide before you price the job.
Third-party listing copy says this unit isn't recommended above 2,000 feet. We found no altitude derating in anything Fogatti publishes, so if you live high, get it confirmed (see our high-altitude guide).

The CF170W is the Fogatti that best fits how most people use a tankless heater: one unit replacing a 40- or 50-gallon tank in a typical home. At $669.99 it costs well under half of what the condensing Rinnai Sensei RX199iN runs ($1,530–$1,980 on our gas roundup). That gap narrows once you add the 24-month warranty and lower efficiency to the comparison (see the trade-offs section below).

2. Fogatti InstaGas Classic CS120 / CS120S: Best for One Bathroom in a Warm Climate

Fogatti InstaGas Classic CS120 (Indoor, 420IN-CS120-NG) and CS120S (Outdoor, 420OD-CS120S-NG)

120,000 BTU · 5.45 GPM at 35°F rise (5.1 GPM on retail listings) · about 2.7 GPM at 70°F rise · UEF >0.81 · $549.99 indoor / $499.99 outdoor at Home Depot

The cheapest way into a whole-home-style Fogatti. The outdoor CS120S also skips an indoor vent run entirely and lists for $50 less than the indoor version.
In Florida, Texas or Southern California, groundwater stays warm enough that the 5.1–5.45 GPM figure holds up for two fixtures. In a northern winter it falls to about 2.7 GPM, which is one shower, and a second fixture will cool it down.
Compact: 22.76 × 14.57 × 7 inches and 25.6 lb indoors, per Fogatti's catalog. It runs on 120V for the fan and controls, not a 240V circuit.
The nearest name-brand alternative on this site is Rinnai's non-condensing V53DeP (5.3 GPM, 120,000 BTU, about $700, 10-year heat exchanger, per our propane roundup). Fogatti saves you about $150 up front in exchange for a much shorter warranty.

If your winter inlet water is cold, size against the 70°F column, not the box. Our tankless sizing guide walks through the inlet-temperature math for your region.

3. Fogatti InstaGas Premium PM180SAW: Best Outdoor Fogatti

Fogatti InstaGas Premium PM180SAW Outdoor Gas Tankless Water Heater (FDG-PM180SAW-NG / -LP)

180,000 BTU · 8.85 GPM at 35°F rise (8.1 GPM on retail listings) · about 4.4 GPM at 70°F rise · outdoor wall-hung · $766.29 natural gas / $669.99 propane at Home Depot

Fogatti's highest-output unit at US home centers. Mounting outdoors means no vent pipe through the house and no indoor combustion air to plan for.
The propane version lists for $96 less than the natural-gas version at Home Depot right now. That's the reverse of the usual pattern, so compare both if you can run either fuel.
Outdoor tankless units rely on electric freeze protection. Fogatti's Lowe's listing copy tells owners to drain the unit if it could drop below about 37°F or will sit unused, so a hard-freeze climate needs a plan for outages (see our freeze-protection guide).
The group's catalog also lists a 199,000 BTU "Classic 199" (on its Mizudo pages) rated at 9.40 GPM at a 35°F rise. We couldn't find it at a major US retailer, so it isn't ranked here.

For outdoor units from Rinnai, Rheem and Eccotemp side by side, see our best outdoor tankless water heater roundup.

4. Fogatti InstaShower 8 Plus and InstaShower Ultra: Best for RVs

Fogatti InstaShower 8 Plus / InstaShower Ultra RV Tankless Water Heaters

8 Plus: 55,000 BTU · up to 2.9 GPM · $519.99 · Ultra: 66,000 BTU · up to 3.9 GPM · mixing tank · $729.99 (both on fogatti.com) · 24-month warranty

The InstaShower 8 Plus is our overall pick in the RV tankless roundup. It drops into a standard 6-gallon tank opening and uses the rig's existing propane and 12V connections.
Fogatti's own store currently lists the InstaShower 7 from $429.99, the 8 Pro (60,000 BTU, up to 3.1 GPM) at $569.99, and the 9 Pro (66,000 BTU, up to 3.6 GPM) from $599.99. That's five drop-in models across four burner sizes (42,000–66,000 BTU).
The 9 Pro and Ultra add a small mixing tank, which smooths the brief hot-cold swings an RV tankless heater can produce when you stop and restart the water (the "cold-water sandwich"). That's worth paying for if you take stop-start "navy" showers to save water.

The trade-offs behind Fogatti’s lower price

Model	Type	Input / flow	Heat exchanger warranty	Price
Fogatti InstaGas Classic CS120	Non-condensing	120k BTU · 5.1–5.45 GPM	24 months (Fogatti warranty page); retailers list 5 yr	$549.99
Rinnai V53DeP	Non-condensing	120k BTU · 5.3 GPM	10 years	About $700
Fogatti InstaGas Comfort CF170W	Non-condensing	170k BTU · 7.5–8.17 GPM	24 months (Fogatti warranty page); retailers list 5 yr	$669.99
Rheem Performance Platinum 9.5	Condensing	199k BTU · 9.5 GPM	12 years	About $1,150
Rinnai Sensei RX199iN	Condensing	199k BTU · 11.1 GPM	15 years	$1,530–$1,980

Rinnai and Rheem rows come from our gas and propane roundups and our warranty comparison.

Warranty: two answers to the same question. Home Depot and Lowe’s listings advertise “5 years on heat exchanger and 2 years on other parts.” Fogatti’s own warranty page lists one 24-month period for “Tankless Hot Gas Water Heater,” excludes all installation and on-site repair labor, and requires registration to activate. Before you buy, ask Fogatti ([email protected] or 877-216-1818) which term applies to your serial number, and keep the reply.
Venting: “reuse your old vent” needs checking. Fogatti’s catalog says most tank heaters’ “exhaust vent, water and gas pipe” can be reused, and Home Depot lists a 3-inch power vent. Pipe size isn’t the issue; vent category is. An atmospheric gas tank usually vents through Category I B-vent, while non-condensing tankless heaters push 300°F+ exhaust under positive pressure, which is why the major brands specify Category III stainless (see our venting guide). We couldn’t find Fogatti’s residential installation manual online to see which category it lists, so have your installer confirm it before reusing a flue.
Efficiency: no ENERGY STAR rebate. At a UEF above 0.81, the InstaGas units sit below the 0.93 example ENERGY STAR uses for a certified gas tankless heater. Utility rebates that require ENERGY STAR certification won’t apply. See our UEF rating explainer for what the gap costs per year.

How to choose a Fogatti tankless water heater

RV or camper with a 6- or 10-gallon tank opening: the InstaShower 8 Plus. Step up to the 9 Pro or Ultra for a fifth wheel or Class A with two people showering back to back.
One bathroom, warm climate, tight budget: the InstaGas Classic CS120 indoors, or the CS120S outdoors for $50 less.
Two bathrooms or a cold-winter climate: the InstaGas Comfort CF170W, the only Fogatti that keeps two showers running at a 70°F rise.
No room inside, mild winters: the PM180SAW outdoor unit, and check the propane price first.
Planning to stay 10+ years, or your installer won’t warranty labor on an import: skip Fogatti and pay more for a Rinnai, Navien or Rheem with a 12–15-year heat-exchanger warranty. Our best tankless water heater guide ranks those.

The bottom line

Fogatti is a budget tankless brand that’s very good at RVs and a reasonable bet for a home if you go in with clear expectations. For a house, the InstaGas Comfort CF170W ($669.99) is the pick: its 170,000 BTU burner is the only Fogatti home unit that holds two showers at a northern-winter 70°F rise, according to Fogatti’s own catalog figures. The Classic CS120 ($549.99) suits a single bathroom in the South. Before buying either, settle two things: which warranty term applies (Fogatti publishes 24 months; retailers advertise 5 years on the heat exchanger) and which vent category the installation manual requires. For an RV, the InstaShower 8 Plus remains our top drop-in pick.