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Atmor AT-910-27TP - User Manual

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www.atmorusa.com
Electric Tankless Water Heaters
ThermoPro Series
Models:
AT-910-18TP, AT-910-24TP, AT-910-27TP,
Hot Water on Demand

Table of Contents

Questions and Answers

  • J
    Jasmine EstesJul 25, 2025
    Why is my Atmor AT-910-27TP Water Heater not hot enough?
    • J
      Jason JacksonJul 25, 2025
      If your Atmor Water Heater is producing water that is not hot enough, you can reduce the water flow rate at the faucet or slightly close the shutoff valve on the unit’s incoming water supply line. You may also increase the temperature setting on the unit. Ensure the shutoff valve is fully open, and the water supply line is not blocked. If you have an anti-scald feature on your faucet that is mixing cold water, these types of faucets can usually be adjusted to reduce the amount of cold water mixed. If you need/ want hotter water, you can compensate for thermal loss due to long pipe run by increasing the setting on your water heater.
  • J
    johnsonjudyJul 29, 2025
    What to do if Atmor AT-910-27TP water is too hot?
    • J
      James LeeJul 29, 2025
      If the water from your Atmor Water Heater is too hot, try increasing the flow rate at the water outlet or switch to a lower temperature setting. Also, check for too little flow, or if the set point temperature is too high.
  • M
    Maria LawrenceAug 2, 2025
    Why does my Atmor AT-910-27TP shut off during use?
    • J
      jacksonrandallAug 3, 2025
      If your Atmor Water Heater shuts off during use, check the power supply and circuit breakers.
  • P
    ppearsonAug 7, 2025
    Why does the water temperature vary from hot to cold during Atmor Water Heater use?
    • J
      jared85Aug 7, 2025
      If the water temperature from your Atmor Water Heater varies from hot to cold during use, increase the flow rate from the water supply source.
  • M
    Michelle BryantAug 11, 2025
    How to fix Atmor AT-910-27TP when there is no hot water and display does not light up?
    • V
      Vanessa RobinsonAug 11, 2025
      If your Atmor Water Heater isn't producing hot water and the display isn't lighting up, start by checking your power supply and circuit breakers. Ensure the breakers at your main electrical panel are on and that the unit is correctly wired. Also, verify the shutoff valve on the incoming water supply line is fully open. Make sure that the flow rate needed to activate the heating element (0.5 gpm) has been reached, increase the flow rate from the water supply source and clean the filter screen on the unit’s water inlet.
  • A
    Anna RamirezAug 15, 2025
    What to do if Atmor Water Heater has no hot water and display does light up?
    • S
      Sandra ArmstrongAug 15, 2025
      If your Atmor Water Heater is not producing hot water but the display does light up, refer to manual (Page 18) for diagram of reset points. Make sure to shut all power on your breaker panel before attempting to reset unit. All resets must be pressed. For potential internal part failure, please call us for further technical assistance.
  • S
    Samuel RobertsAug 19, 2025
    Why did the water stop flowing from my Atmor Water Heater?
    • A
      andrea22Aug 19, 2025
      If water stops flowing from your Atmor Water Heater, make sure the main water line valve is fully open, and there are no obstructions in the water supply line.

Summary

Important Safety Guidelines

Safety Alert Symbols and Words

Explains safety alert symbols and words used in the manual for hazard communication.

Critical Usage Warning

Emphasizes reading the manual before installation and use to avoid damage, injury, or death.

Before Installing

Warranty and Return Policy

Informs about manufacturer's warranty and authorized dealer's return policy upon installation.

Safety Guidelines

Adherence to Safety Guidelines

Warns that failing to follow safety guidelines can lead to severe injury or death.

About Your Atmor Electric Tankless Water Heater

Water Temperature Safety

Advises caution when setting water temperature to prevent burns, especially for vulnerable individuals.

Selecting an Installation Location

Location Safety and Environmental Precautions

Covers child safety, avoiding freezing temps, humidity, dust, and flammable materials for proper installation.

Leakage Damage Prevention Measures

Suggests avoiding locations prone to damage from leaks by using drip pans or leak detectors.

Mounting Your Water Heater

Mounting Procedures and Safety

Details mounting steps, upright orientation, flammable material clearance, and ensuring level installation.

Upper Floor Installation Compliance

Stresses compliance with local codes for installations in upper floors or attics, including leak prevention.

Plumbing Requirements and Precautions

Code Compliance and Soldering Warning

Stresses adherence to plumbing codes and warns against soldering connected pipes to prevent sensor damage.

Pressure and Flow Rate Specifications

Details maximum operating pressure and minimum required flow rate for proper unit operation.

Plumbing Installation Steps

Line Flushing and Air Purging

Emphasizes flushing water lines and purging air from the unit before powering on to prevent damage.

Leak Detection and Response

Advises immediate response to water leaks, including shutting off supply and contacting service.

Electrical Requirements and Precautions

Electrical Code and Safety Compliance

Advises installation compliance with electrical codes and stresses power shutoff safety before work.

Power Availability and Wiring Standards

Covers ensuring sufficient power and adhering to wiring standards like NEC/CEC for safe installation.

Electrical Installation Steps

Connection and Verification Procedures

Details connecting wires to the breaker, routing cables, and double-checking connections for correctness and security.

Correct Wiring for Unit Operation

Stresses the importance of following wire connection instructions for correct unit operation and avoiding issues.

Flow Rate Specifications

Operation Guide

System Operation and Limitations

Explains demand-based heating, flow rate limitations, and seasonal impacts on hot water supply.

Household Reading Recommendation

Recommends that all household members read the operating instructions for optimal use.

Water Quality Considerations

Water Quality for Heater Longevity

Emphasizes considering water quality for installation and maintenance to prevent heater damage.

Scale Prevention and Maintenance

Recommends water treatment, filter cleaning, and flushing to prevent scale buildup and maintain performance.

Care and Maintenance

Maintenance Warning and Procedures

Warns that improper maintenance can cause permanent damage and void warranty; outlines basic checks.

User Interface and Controls

Post-Maintenance Procedures

Details purging air from lines and checking temperature after maintenance to ensure safe operation.

Power and Temperature Adjustment

Explains how to control power and set output water temperature using the knob, including recommended settings.

Safety Warnings for Temperature Settings

Warns that higher temperature settings can cause severe scalding injuries, especially to children and the elderly.

First-Time System Startup

Initial Operation and Temperature Setting

Describes activating the heater for the first time with running water and setting the recommended temperature.

Protection Against Freezing Temperatures

Freezing Protection and Warranty

Advises protecting the heater from freezing and warns that freezing damage is not covered by warranty.

Troubleshooting Common Issues

No Hot Water or Display Problems

Addresses issues with no hot water and display not lighting up or being on, providing causes and solutions.

Insufficient Heating Issues

Provides solutions for water being heated but not hot enough, covering low settings, pressure, and mixing.

Thermal Loss and Pipe Issues

Explains thermal loss in long pipes and suggests increasing the heater's temperature setting to compensate.

Voltage Impact and Overheating

Unit Shutdown and Flow Interruption

Addresses the heater shutting off or water flow stopping, suggesting power and supply line checks.

Variable Temperature Troubleshooting

Troubleshoots variations in water temperature during use, citing potential causes like flow rate or temperature settings.

Resetting the Unit

Unit Reset Procedure and Caution

Details the reset button procedure and warns against frequent resetting, advising customer service contact.

Limited Warranty Information

Warranty Coverage and Service

Outlines the two-year warranty, service contact, and conditions that void the warranty.

Atmor AT-910-27TP Specifications

General IconGeneral
BrandAtmor
ModelAT-910-27TP
CategoryWater Heater
LanguageEnglish

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