11 Fogatti 11kw Tankless Water Heater Review of 2026 For Single Fixtures

1

WINTEMP 11kW Tankless Water Heater Electric 240V, Up to 2.6

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  9.7
• Brand
  WINTEMP

Key specs2

Electrical Service

Requires a 240V hardwired setup pulling up to 46A, which demands a dedicated 50A double-pole breaker and 8 AWG wiring with ground.

Cold Climate Output

While reaching up to 2.6 GPM in warmer southern zones, incoming cold groundwater in northern climates limits this 11kW unit to low-flow sink use.

Pros & cons53

Pros

• Self-modulating heating draws power only during active water flow to eliminate standby losses
• Up to 2.6 GPM maximum output easily supplies a dedicated shower in warmer southern climates
• Compact 9.7 by 14.1 inch wall-mount profile fits inside small utility closets or sink cabinets
• Protected by ETL certification with built-in leakage, overheat, and dry-fire shutoffs
• Backed by a 2-year return and exchange warranty with professional technical support

Cons

• In cold regions heating capacity drops to point-of-use faucets and office sinks
• Requires a dedicated 240V circuit with a 50A double-pole breaker and 8 AWG copper wire
• Cannot support simultaneous multi-room hot water demands throughout a home

2

FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, RV Hot

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  9.7
• Brand
  FOGATTI

Key specs2

Fuel and Power Source

Runs on RV propane and 12V power rather than standard residential 240V electricity, designed exclusively for mobile camper plumbing.

High Altitude Rating

Rated up to 9,800 feet elevation

Pros & cons53

Pros

• Generates 66,000 BTU to deliver up to 3.6 GPM for simultaneous RV shower and galley sink use
• High-altitude heat exchanger maintains stable combustion up to 9,800 feet elevation
• Internal mixing tank stabilizes water temperature fluctuations to within plus or minus 1 degree
• Comes packaged with a 150 PSI pressure relief valve, remote control, and 15-inch door assembly
• Replaces standard Suburban and Atwood 6-gallon water heater openings without cabinet alterations

Cons

• Engineered specifically for RV propane installations and cannot replace residential 240V heaters
• Door cutout requires 13 by 13 inches and needs an optional 18-inch door to retrofit 10-gallon spaces
• Substantially heavier than residential electric units at 30.9 pounds

3

11kW Electric Tankless Water Heater 240V On Demand Hot Water

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  9.5
• Brand
  WINTEMP

Key specs2

Temperature Range

86°F to 140°F digital display

Mounting Footprint

Measures 9.7 inches wide by 14 inches high and weighs 8.6 pounds, fitting easily into tight bathroom cabinets or under sinks.

Pros & cons53

Pros

• Digital control screen allows precise temperature adjustments between 86 and 140 degrees Fahrenheit
• Provides continuous on-demand hot water up to 2.6 GPM without waiting for a tank to recover
• Self-modulating power regulation matches real-time flow rate to conserve electrical energy
• ETL-certified safety system includes dry-fire, electrical leakage, and overheat cutoffs
• Backed by a 2-year warranty and dedicated technical support

Cons

• Requires 240V service with a dedicated 50A breaker and 8 AWG wiring that smaller panels lack
• Output flow rate drops when incoming groundwater temperatures fall in winter months
• Sized for single-fixture point-of-use and cannot supply multiple bathrooms at once

4

Westinghouse 11kW Tankless Water Heater Electric 240V, Wifi, ETL, Gray

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  9.1
• Brand
  Westinghouse

Key specs2

Smart Controls

• WiFi and mobile app temperature adjustments
• Voice commands compatible with Alexa and Google Home
• Automatic temperature memory following power interruptions

Breaker Requirement

60A double-pole breaker at 240V

Pros & cons53

Pros

• Integrated WiFi enables remote temperature adjustment and voice operation via Alexa or Google Home
• Restores your preferred target temperature automatically after a power outage with built-in memory
• Separated water and electrical pathways help prevent internal scale accumulation and corrosion
• Delivers hot water in 3 seconds with a listed 98 percent thermal efficiency rating
• Removable inlet filter and rotor allow straightforward manual cleaning every 6 months

Cons

• Demands a dedicated 60A double-pole breaker, higher than the 50A breaker needed by rival 11kW units
• Minimum activation flow of 0.53 GPM will not trigger heating during very low trickle demands
• Delivers 2.6 GPM only under moderate 62-degree inlet water conditions

5

11kW Tankless Water Heater Electric, 240 Volt On-Demand Water Heater

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  9.0
• Brand
  MIZUDO

Key specs2

Seasonal Flow Estimates

• Summer (62°F to 78°F inlet): up to 2.6 GPM
• Spring (57°F to 62°F inlet): up to 1.6 GPM
• Fall (47°F to 57°F inlet): up to 1.5 GPM
• Winter (37°F to 47°F inlet): down to 1.2 GPM

Activation Threshold

0.4 GPM minimum flow

Pros & cons53

Pros

• Low 0.4 GPM activation threshold turns on heating with lower water flow than many competitors
• Provides explicit seasonal flow estimates ranging from 2.6 GPM in summer down to 1.2 GPM in winter
• Rapid processor performs 20,000 adjustments per second to maintain output within 1 degree
• Slim 2.8-inch depth fits neatly into cramped spaces behind sinks or inside bathroom vanities
• Listed 98 percent efficiency eliminates standby heat loss from idle storage tanks

Cons

• Winter output drops to 1.2 GPM when incoming water drops to 37 to 47 degrees
• Strictly limited to single-point duty such as one shower or one isolated sink
• Warranty coverage is limited to 1 year for return and exchange

6

FOGATTI InstaShower 8 Plus RV Tankless Water Heater, Propane On

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  8.9
• Brand
  FOGATTI

Key specs2

Propane Heating Capacity

Produces 55,000 BTU on LP gas to supply up to 2.9 GPM of continuous shower flow without drawing heavy amperage from an electrical panel.

High Altitude Rating

Maintains combustion up to 9,800 ft

Pros & cons53

Pros

• Delivers 55,000 BTU of propane heat producing up to 2.9 GPM of continuous hot water for RV showers
• Staged combustion system automatically regulates flame intensity in summer to prevent scalding
• Operates reliably at altitudes up to 9,800 feet without stalling or burner failure
• Standard 13 by 13 inch cutout directly replaces common 6-gallon Suburban and Atwood tanks
• Includes a factory-installed pressure relief valve, 15-inch white door, and 2-meter remote control

Cons

• Powered by LP gas and camper electrics rather than standard 240V residential house wiring
• Replacing a 10-gallon tank water heater requires retrofitting with a separate 18 by 18 inch door
• Cube-shaped 15-inch exterior housing requires direct exterior wall venting on recreational vehicles

7

Fogatti Tankless Water Heater Electric 11kw 240V Max 2.6GPM 1

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  8.6
• Brand
  FOGATTI

Key specs2

Fixture Capacity

Capable of running a shower and sink together only when inlet water is 77°F or warmer; colder incoming groundwater restricts the unit strictly to single-point operation.

Electrical Service

Requires a dedicated 240V circuit, a single 50A double-pole breaker, and 8 AWG wire; incompatible with standard 120V household outlets.

Pros & cons53

Pros

• Microprocessor checks conditions 20,000 times per second to hold water within 1 degree of set temperature
• Reaches up to 98 percent thermal efficiency to minimize electricity usage during active heating
• Intuitive rotary knob and digital display provide smooth temperature selection from 86 to 140 degrees
• Compact 14.3 by 9.6 by 3.5 inch chassis mounts on walls in tight cabins, apartments, and utility closets
• Built with ETL-certified internal safety systems including overheat cutoff and leakage protection

Cons

• Simultaneous two-fixture use requires a high 77-degree inlet temperature, dropping to single-point in cooler weather
• Needs a dedicated 240V circuit with a 50A breaker and 8 AWG wiring, and will not run on 120V
• Minimum activation flow rate of 0.5 GPM means low-dribble faucet use will not engage the heating elements

8

FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 5.1

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  8.6
• Brand
  FOGATTI

Key specs2

Whole-Home Capacity

Supplies up to 5.1 GPM through 120,000 BTU of natural gas heating, serving 2 to 4 fixtures simultaneously for medium-sized homes.

Fuel and Power Source

Natural gas heating with 120V AC ignition

Pros & cons53

Pros

• Powerful 120,000 BTU natural gas burner delivers up to 5.1 GPM to supply 2 to 4 plumbing fixtures at once
• Advanced water servo technology and four-stage combustion keep temperatures steady within 1 degree
• Outdoor installation frees up interior utility space and eliminates the need for indoor venting pipe
• Operates across a wide water pressure range from 15 to 150 PSI for reliable low-pressure performance
• Built with a durable copper heat exchanger, 304 stainless steel burner, and CSA safety certification

Cons

• Outdoor natural gas setup requires an exterior gas supply line and cannot run on indoor 240V electric lines
• Requires an exterior wall location and standard 120V AC plug for its electronic ignition and control board
• At 29.3 pounds and over 26 inches tall, it requires considerably more mounting space than electric models

9

ThermoMate Tankless Water Heater Electric, 11kW 240 Volt On Demand

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  8.0
• Brand
  thermomate

Key specs2

Heating Core Design

Employs an isolated cast aluminum chamber where water channels never contact the heating elements, reducing scale deposits and leak risks.

Wiring Requirement

Requires 6 AWG copper wire on 50A breaker

Pros & cons53

Pros

• Cast aluminum heating chamber isolates electrical elements from water to prevent scale and corrosion
• Compact 7.1 by 10.6 inch profile with side water ports simplifies plumbing in cramped utility spaces
• Self-modulating control adjusts power to achieve listed 99 percent energy heating efficiency
• Built-in dry-fire protection automatically stops heating elements when water flow is interrupted
• Delivers up to 2.15 GPM at a 35-degree Fahrenheit temperature rise for dedicated sink fixtures

Cons

• Calls for heavier 6 AWG copper wire to its 50A breaker rather than the 8 AWG wire used by rivals
• Maximum water temperature tops out at 131 degrees Fahrenheit rather than the standard 140 degrees
• Output rate of 2.15 GPM at a modest 35-degree rise limits performance in cold northern winters

10

FOGATTI RV Tankless Water Heater, 3 Optional Door Sizes 15"x15",

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  7.7
• Brand
  FOGATTI

Key specs2

Freezing Protection

Equipped with active antifreeze safeguards rated down to -22°F, protecting RV water lines during harsh winter camping trips.

RV Cutout Compatibility

• Replaces standard RV tank and tankless heaters
• Requires separate 15x15, 15x18, or 18x18 inch door
• Operates on 12V DC power and propane gas

Pros & cons53

Pros

• Features built-in antifreeze protection that safeguards internal plumbing components down to -22 degrees Fahrenheit
• Provides 48,000 BTU of propane heating delivering up to 2.5 GPM without needing anode rod maintenance
• Staged combustion regulates burner output to minimize cold water pockets and scalding spikes
• High-altitude engineering operates reliably on camper trips up to 9,800 feet elevation
• Comes standard with a pre-installed 150 PSI pressure relief valve and a 6.6-foot wired remote

Cons

• Outer access doors in 15x15, 15x18, or 18x18 inch sizes must be purchased separately for installation
• Operating temperature on the remote control is capped between 95 and 123 degrees Fahrenheit
• Designed solely for 12V DC RV systems running LP gas, not for 240V residential house panels

11

Rheem 11kW 240V Tankless Electric Water Heater

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  7.5
• Brand
  Rheem

Key specs2

Panel Recommendation

Minimum 100A electrical service panel

Flow Performance

Provides up to 2.68 GPM on demand, making it suitable for a dedicated residential shower when inlet temperatures are moderate.

Pros & cons53

Pros

• Delivers up to 2.68 GPM of continuous hot water, the highest flow among the compared 11kW electric units
• Digital thermostatic interface adjusts in precise 1-degree increments from 80 to 140 degrees Fahrenheit
• Lightweight 7.05-pound housing mounts easily to wall framing without specialized structural brackets
• Standard 8 AWG wiring and single 50A double-pole breaker fit common residential panel upgrades
• Compact 12.6 by 8.25 inch frame conserves space in tight laundry closets or bathroom enclosures

Cons

• Rheem recommends a minimum 100A main electrical service panel to ensure sufficient operating headroom
• Multiple fixture support is restricted to warmer climates where incoming water temperatures remain mild
• Hardwired installation requires dedicated copper conductors and cannot utilize existing 120V wiring

Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Can the Fogatti 11kW electric tankless water heater run a shower and a sink at the same time?

No, the Fogatti 11kW is built primarily for single-fixture point-of-use applications rather than running multiple high-demand fixtures at once. The manufacturer rates this unit for a maximum flow of 2.6 GPM when incoming water is 77 degrees Fahrenheit and heating to a 110 degrees Fahrenheit outlet. If you turn on a sink while someone is showering, dividing that flow rate can lead to sudden temperature drops or lukewarm water. For dedicated single-outlet installations like a remote wash station or a tankless water heater for outdoor shower setup, the flow is steady as long as only one fixture runs.

What breaker size and wiring does the Fogatti 11kW require?

The unit requires a dedicated 240V electrical circuit protected by a 50A breaker and 1 set of 8 AWG wires. It is not compatible with 120V household lines or standard wall plugs. Plumbing connections require standard 1/2-inch NPT fittings. Before purchasing, verify that your main electrical panel has enough available amperage capacity to support a dedicated 50-amp draw without overloading your home system.

How does incoming groundwater temperature affect hot water flow rate?

Incoming water temperature directly limits the volume of hot water the heater can deliver. The listed 2.6 GPM maximum output depends on incoming water entering at 77 degrees Fahrenheit to reach a target temperature of 110 degrees Fahrenheit. In northern regions or during winter months where groundwater drops significantly below 77 degrees Fahrenheit, the unit must work harder to heat incoming water, which lowers the usable flow rate. When dealing with cold incoming water, expect single-fixture performance to deliver noticeably lower gallons per minute to maintain your set temperature.

What minimum water flow rate is needed to turn on the Fogatti 11kW?

The heater requires a minimum flow rate of 0.5 GPM to trigger the heating elements. If a faucet is barely cracked open or fitted with a highly restrictive low-flow aerator below 0.5 GPM, the internal sensor will not activate, leaving the water unheated. Ensuring your plumbing lines and fixtures allow at least 0.5 GPM prevents the unit from cycling off unexpectedly during low-flow use.

How does the Fogatti 11kW electric heater differ from Fogatti RV models?

The Fogatti 11kW is a stationary residential electric heater requiring a 240V line, whereas Fogatti RV models run on liquid propane and 12V DC power. RV options like the Fogatti InstaShower series offer outputs such as 66,000 BTU, deliver up to 3.6 GPM, operate at altitudes up to 9,800 feet, and fit standard 15x15-inch exterior door openings. If you need portable or off-grid heating, comparing portable options like a propane heater for home or RV use will serve you better than this high-amperage 240V stationary electric appliance.

How do the electrical requirements of the Fogatti 11kW compare to Westinghouse or Rheem?

While the Fogatti 11kW requires a 50A breaker, electrical requirements vary across 11kW brands. The Westinghouse 11kW requires a dedicated 60A double-pole breaker with 8 AWG wire at 240V, while the Fogatti 11kW, WINTEMP 11kW, and MIZUDO 11kW specify a 50A breaker. For flow capacity, Rheem lists its 11kW 240V model at up to 2.68 GPM, compared to 2.6 GPM on the Fogatti. Always check your breaker panel capacity first, as installing a unit requiring 60A is impossible if your panel only has space for a 50A circuit.