Kepler MGWH199IXNN

Kepler MGWH199IXNN is in the DOE listing as of Oct 19, 2026. Kepler MGWH199IXNN is in the ENERGY STAR list as of Oct 19, 2026.

Gas tankless water heater
2 listed models

Its figures are also listed under Elios EROD199N0000.

Flow at a 67°F rise: 5.7gallons per minute
UEF: 0.95Uniform energy factor

See it among every gas tankless model

Flow where you live

The heater gives less flow when colder incoming water needs a bigger rise.

Cold water: Cold water must be at least 10°F colder than the hot water setting.
Flow estimate: The estimate uses the lowest certified flow among the listed models. It is about 5.5 gal/min at a 70°F rise.

Flow limits

The estimate excludes the flow needed to turn the heater on, heat lost in pipes, and installation.
Cold water from a well or long pipe run can differ from the temperature you enter.
Without a stated flow limit, estimates for warmer water may exceed the heater’s actual flow.

Product history

Kepler MGWH199IXNN was in the DOE listing by Oct 1, 2026.

Kepler MGWH199IXNN has a recorded ENERGY STAR market-availability date of May 30, 2024. It first appeared in the ENERGY STAR list between July 2024 and September 2024.

Certified figures by listed model

Kepler MGWH199IXNN: certified figures by listed model
Model number	UEF	Flow at a 67°F rise (gal/min)	Recovery efficiency	Draw pattern
JSG52-32PCH/199KNP	0.95	5.7	99%	High
JSG52-32PCH/199KWP	0.95	5.7	99%	High

UEF is the uniform energy factor. A dash means the model has no such figure.

ENERGY STAR certified models

Kepler MGWH199IXNN: ENERGY STAR certified models
Model number	UEF	Flow at a 67°F rise (gal/min)	Recovery efficiency
JSG52-32PCH/199KNP	0.96	5.7	99%
JSG52-32PCH/199KWP	0.96	5.7	99%

It heats 5.7 gallons per minute of water by 67°F in the test. The median flow among gas tankless models is 4.8 gallons per minute. Of 487 gas tankless models, 60 have a higher flow than this one.

All 2 of its model numbers are ENERGY STAR certified. In tests, 95% of the energy it uses ends up as hot water (UEF 0.95). The daily hot water use in the test, called its draw pattern, was high. Of 399 gas tankless models with the same draw pattern, 49 have a higher UEF. A UEF of 0.93 is the median for its type and draw pattern. While it heats water, 99% of the energy used goes into the water (its recovery efficiency).

It is the basic model for JSG52-32PCH/199KNP and JSG52-32PCH/199KWP. All of its test figures are shared by 15 other basic models. In all, 4 other brands list one or more of them. You can find the whole group on the page for the Elios EROD199N0000.

In 7 states, 6 rebate programs may accept it. It may qualify for 2 more if it meets terms its figures do not show.

Also listed as

They carry every figure in the table above.

3 more basic models carry these figures.

Rebates

Kepler MGWH199IXNN: rebate programs
Program	State	Status	Program page
SoCalGas High-Efficiency or ENERGY STAR Certified Natural Gas Tankless Water Heaters rebate	CA	May qualify	Its own page
Colorado Springs Utilities Water heater rebate (gas storage, gas tankless)	CO	May qualify	Its own page
Nicor Gas Energy Efficiency Rebates for Your Home (gas tankless)	IL	May qualify if it meets the other terms	Its own page
DTE Energy Water Heaters (gas storage, gas tankless)	MI	May qualify	Its own page
Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless)	MN	May qualify	Its own page
PSE&G Tankless Water Heaters	NJ	May qualify	Its own page
Energy Trust of Oregon Residential Incentives	OR, WA	May qualify	Its own page
Focus on Energy (gas tankless)	WI	May qualify if it meets the other terms	Its own page

Programs change their terms. Check the program's own page before you buy.

Updated Oct 19, 2026 · Methodology

Not covered

Advertised figures. We have none on file for this model.