State Water Heaters T-H3M-DV User Manual

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Gas Tankless Water Heater

TM

Suitable for potable water heating and space-heating

Please refer to local codes for space-heating compliance.

If you have any questions, please

call or write to:

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Toll Free: 1-877-737-2840

WARNING

- Do not store or use gasoline or other

flammable vapors and liquids in the vicinity

of this or any other appliance.

- WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch, do not

use any phone in your building.

• Immediately call your gas supplier from

a neighbor's phone. Follow the gas

supplier's instructions.

• If you cannot reach your gas supplier, call

the fire department.

- Installation and service must be performed

by a qualified installer, service agency or the

gas supplier.

On-Demand Water Heater

Installation Manual and Owner’s Guide

ANSI Z21.10.3 and CSA 4.3

If the information in these

instructions is not followed

exactly, a fire or explosion may

result causing property damage,

personal injury or death.

FEATURING

• ENDLESS HOT WATER

• ON-DEMAND USAGE

• COMPACT, SPACE SAVING

• ENERGY CONSERVATION

• COMPUTERIZED SAFETY

• NO PILOT LIGHT

• Satisfies the 2012 SCAQMD Rule

1146.2 for Ultra-Low NOx

Emissions

Model

• 140 Outdoor (T-H3M-OS)

• 140 Indoor (T-H3M-DV)

Questions and Answers:

C
cordovajoeAug 14, 2025
What to do if hot water is not available from my State Water Heaters T-H3M-DV?
- J
  Jon PittmanAug 15, 2025
  To troubleshoot the issue of hot water not being available when a fixture is opened in your State Water Heaters Water Heater, verify the unit has a 120 VAC, 60 Hz power supply. If using a remote or temperature controller, ensure it's powered on. Check that both gas and water supply valves are fully open, and the cold water inlet filter is clean. Ensure the hot water fixture is open enough to draw at least 0.5 GPM (1.9 L/min) through the heater. Also, check if the unit is frozen or plumbed backward, and ensure there's enough gas in the tank or cylinder.
Q
qjacksonAug 17, 2025
Why does the hot water from my State Water Heaters T-H3M-DV turn cold and stay cold?
- K
  Kayla JohnsonAug 17, 2025
  If the hot water from your State Water Heaters Water Heater turns cold and stays cold, first check if the flow rate is sufficient to keep the water heater running. If a recirculation system is installed, verify that the recirculation line has enough check valves. Also, ensure the gas supply valve is fully open, the filter on the cold water inlet is clean, and the fixtures are free of debris and obstructions.
A
Alan ThomasAug 21, 2025
How to fix temperature fluctuation in State Water Heaters T-H3M-DV Water Heater?
- P
  Peter PerryAug 21, 2025
  To address temperature fluctuations in your State Water Heaters Water Heater, start by checking if the filter on the cold water inlet is clean. Then, verify that the gas line is properly sized and the supply gas pressure is sufficient. Lastly, inspect for any cross-connections between the cold and hot water lines.
O
owalkerAug 25, 2025
What to do if State Water Heaters T-H3M-DV unit does not ignite?
- C
  Carolyn Carroll MDAug 26, 2025
  If your State Water Heaters Water Heater unit doesn't ignite when water flows through it, start by ensuring the power is on. Next, check if the gas supply is on and if the flow rate exceeds 0.5 GPM (1.9 L/min). Also, verify that the filter on the cold water inlet is clean, and check for reverse or cross-connections. If you're using a remote or temperature controller, make sure it's powered on. Finally, check if the inlet temperature is too high.
W
William LeeAug 28, 2025
Why is the water from my State Water Heaters T-H3M-DV too hot?
- A
  Anthony SampsonAug 28, 2025
  If the water from your State Water Heaters Water Heater is too hot, check if the set temperature is set too high.
M
Michael CobbAug 31, 2025
How to troubleshoot abnormal sounds from State Water Heaters T-H3M-DV?
- S
  sdanielsAug 31, 2025
  If your State Water Heaters Water Heater is making abnormal sounds, confirm that the correct gas type is installed and that the DIP switch settings for your altitude are correctly configured. Also, check the flame quality, and ensure that the intake or exhaust vent isn't blocked. Verify that the vent length and diameter are correct, and that the manifold pressure is properly set.
K
Kelly NguyenSep 3, 2025
Why is the water from my State Water Heaters Water Heater not hot enough?
- G
  George FergusonSep 3, 2025
  If the water from your State Water Heaters Water Heater is not hot enough, compare the flow and temperature. Check for cross-plumbing between the cold and hot water lines. Ensure the gas supply valve is fully open, the gas line is properly sized, and the gas supply pressure is sufficient. Finally, verify that the set temperature isn't set too low.
S
Susan DixonSep 6, 2025
How to get hot water faster from my State Water Heaters T-H3M-DV?
- J
  James CabreraSep 7, 2025
  If it takes a long time to get hot water at the fixtures with your State Water Heaters Water Heater, consider installing a hot water recirculation system to receive hot water quicker.
J
Jaime BarnesSep 10, 2025
What to do if the controller of State Water Heaters T-H3M-DV Water Heater doesn't display anything?
- T
  tina16Sep 10, 2025
  Ensure the State Water Heaters Water Heater is receiving power and that its connection is correct if the controller displays nothing when turned on.

State Water Heaters T-H3M-DV Specifications

General

Brand	State Water Heaters
Model	T-H3M-DV
Type	Tankless
Fuel Type	Natural Gas
Energy Factor	0.82
Voltage	120 V
Venting	Direct Vent
Ignition System	Electronic
Heat Exchanger	Copper
Gas Connection	3/4" NPT
Water Connection	3/4" NPT

Summary

Specifications

Safety and Operation

Safety Guidelines

General safety precautions and installation guidelines for the water heater.

Operating Safety

Crucial safety information and instructions for safe startup and operation.

Normal Operation

Details on controller display, temperature settings, and system features.

Installation Procedures

General Installation

General installation guidelines, clearances, and model-specific instructions.

Clearances and Venting

Specifies required clearances and instructions for installing vent systems.

Gas, Water, and Electrical Connections

Details on gas supply, water connections, condensate drain, and electrical hookups.

High-Altitude Installations

Adjustments for water heater performance based on installation altitude.

Maintenance and Troubleshooting

Maintenance

Routine maintenance tasks including unit draining, filter cleaning, and descaling.

Troubleshooting

Guide for diagnosing and resolving common problems and error codes.

Warranty and Parts

Parts List

Comprehensive list of all components and their part numbers for the water heater.

Limited Warranty

Information on product warranty coverage, terms, and exclusions.

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