John Wood T-H3S-DV-N 1**

John Wood T-H3S-DV-N 1** is in the DOE listing as of Oct 19, 2026. John Wood T-H3S-DV-N 1** is in the ENERGY STAR list as of Oct 19, 2026.

Gas tankless water heater
2 listed models

Its figures are also listed under A. O. Smith T-H3S-DV-N 1**.

Flow at a 67°F rise: 5.4gallons per minuteCertified
Advertised flow: 8.0gallons per minuteJohn Wood, no rise stated
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 5.2 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.

Advertised and certified figures

John Wood T-H3S-DV-N 1**: advertised and certified

John Wood T-H3S-DV-N 1**: advertised figures, where and when read
Figure	Advertised	Certified	Advertiser	Read
UEF	0.94	0.95	John Wood	Read Oct 5, 2026
Flow	8.0 gal/min, no rise stated	5.4 gal/min at a 67°F rise	John Wood	Read Oct 5, 2026

See how advertised flow compares across tankless models

Certified figures by listed model

John Wood T-H3S-DV-N 1**: certified figures by listed model
Model number	UEF	Flow at a 67°F rise (gal/min)	Recovery efficiency	Draw pattern
JWT-340H-N 1**	0.95	5.4	97%	High
JWT-340H-P 1*1	0.95	5.4	97%	High

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

ENERGY STAR certified models

John Wood T-H3S-DV-N 1**: ENERGY STAR certified models
Model number	UEF	Flow at a 67°F rise (gal/min)
JWT-340H-N 1**	0.95	5.4
JWT-340H-P 1*1	0.95	5.4

At a 67°F rise, its flow in the test is 5.4 gallons per minute. The median gas tankless model heats 4.8 gallons per minute by 67°F. Of 487 gas tankless models, 100 have a higher flow than this one.

Under this basic model, 2 model numbers are ENERGY STAR certified. In tests, 95% of the energy went to hot water, so its UEF is 0.95. In the test, daily hot water use was set to high (its draw pattern). Of 399 gas tankless models with the same draw pattern, 49 have a higher UEF. On its draw pattern, the median gas tankless UEF is 0.93. Of the energy it spends heating water, 97% ends up in it (its recovery efficiency).

It is sold as JWT-340H-N 1** and JWT-340H-P 1*1. Its test figures match those of 7 other basic models. They are listed under 7 other brands, one each. For the full group, see the A. O. Smith T-H3S-DV-N 1** page.

It may qualify for 6 rebate programs. 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.

Rebates

John Wood T-H3S-DV-N 1**: 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

Changes to an advertised figure after the date beside it.