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Atmor AT-910-24TP - 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

  • S
    Stephanie HayesJul 25, 2025
    Why is my Atmor AT-910-24TP not hot enough?
    • K
      Kendra PattersonJul 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
    john62Jul 29, 2025
    What to do if Atmor AT-910-24TP water is too hot?
    • M
      Mary PooleJul 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.
  • G
    garrisonjonAug 3, 2025
    Why does my Atmor AT-910-24TP shut off during use?
    • K
      Karen BrownAug 3, 2025
      If your Atmor Water Heater shuts off during use, check the power supply and circuit breakers.
  • R
    Ricky MillerAug 7, 2025
    Why does the water temperature vary from hot to cold during Atmor AT-910-24TP use?
    • J
      John PetersenAug 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.
  • S
    Sara RodriguezAug 11, 2025
    How to fix Atmor Water Heater when there is no hot water and display does not light up?
    • H
      hopkinsmaryAug 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.
  • R
    Robert LambertAug 16, 2025
    What to do if Atmor Water Heater has no hot water and display does light up?
    • U
      ubarryAug 16, 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.
  • R
    Robin MillerAug 19, 2025
    Why did the water stop flowing from my Atmor AT-910-24TP?
    • C
      craigmeyersAug 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 Guideline

Safety Alert Symbols and Words

Defines safety alert symbols and words used to convey risks to users.

General Safety Warning

Emphasizes reading the manual thoroughly before installation and use to prevent injury or property damage.

California Proposition 65 Warning

Alerts users about cancer and reproductive harm, referencing P65Warnings.ca.gov.

Safety Guidelines

General Installation and Usage Safety

Outlines essential safety rules for installation, operation, and use of the water heater.

Electrical Safety Precautions

Details critical electrical safety measures, including grounding and dedicated circuit breakers.

Environmental Installation Warnings

Advises against installing the unit in environments with direct sunlight, moisture, or freezing temperatures.

About Your Atmor Electric Tankless Water Heater

Water Temperature Safety

Warns about severe burns from hot water and recommends careful temperature settings for safety.

Selecting an Installation Location

Indoor Installation Requirement

Specifies that the water heater is designed exclusively for indoor installation.

Location Restrictions and Risks

Lists locations to avoid like freezing areas, high humidity, or potential leak zones.

Flammable Materials Proximity Warning

Alerts users to keep flammable materials away from the heater due to its heat-producing nature.

Mounting Your Water Heater

Secure Wall Mounting Instructions

Provides step-by-step guidance for securely mounting the water heater on a solid surface.

Correct Installation Orientation

Specifies the required upright position with water inlet and outlet at the bottom.

Clearance and Safety Placement

Details required clearances and safe placement of the unit and related materials.

Plumbing Requirements and Precautions

Plumbing Code Compliance

Emphasizes adherence to national, state, and local plumbing codes during installation.

Soldering Pipe Warning

Warns against soldering pipes while the unit is connected to prevent damage to the flow sensor.

Pressure Relief Valve Guidance

Discusses the use and requirements for pressure relief valves based on local installation codes.

Water Pressure and Flow Rate Specs

Lists maximum operating pressure and minimum flow rate required for proper unit function.

Plumbing Installation Steps

Step 1: Flush Water Supply Lines

Instructs to thoroughly flush cold water lines to remove debris before connection.

Step 2: Connect Inlet and Outlet Pipes

Details connecting the hot water outlet and cold water inlet lines to the heater.

Step 3: Purge Air from Plumbing

Explains purging air from lines before powering up to prevent heating element damage.

Step 4: Inspect for Water Leaks

Advises a thorough inspection of all connections for leaks after plumbing installation.

Electrical Requirements and Precautions

Electrical Code and Electrician Consultation

Mandates installation per electrical codes and recommends consulting a qualified electrician.

Critical Power Shut-off Warning

Stresses shutting off power at the breaker before electrical work to prevent severe injury or death.

Wire Gauge and Power Supply Check

Requires compliance with codes for wiring/protection and ensuring adequate home electrical power.

Electrical Installation Steps

Connect Power to Breaker

Guides connecting the power wire pair to the correct breaker, ensuring power is off.

Route and Connect Power Cables

Details running power cables from the breaker to the water heater terminal block.

Grounding Conductor Requirement

Highlights the necessity of a separate ground conductor for each incoming electrical circuit.

Verify Electrical Connections

Emphasizes double-checking connections, wire gauge, and grounding for correctness and security.

Restore Power to Unit

Instructs to restore power after air purging and reattaching the unit cover.

Flow Rate Information

Temperature Rise Performance Chart

Presents a chart showing maximum temperature rise based on flow rate and inlet water temperature.

Operation Guide

Understanding Tankless Hot Water

Explains how the unit heats water on demand and its energy efficiency benefits.

Flow Sensor and Heating Activation

Describes how the flow sensor triggers heating elements based on demand and temperature.

Flow Rate Capacity Limits

Informs users about maximum flow rates and their impact on the unit's heating capability.

Water Temperature Management

Advises on mixing less cold water and notes seasonal inlet temperature effects.

Water Quality Considerations

Impact of Water Quality on Heater

Explains how water quality affects the heater and recommends treatment for hard water.

Care and Maintenance Procedures

Routine Inspection for Damage

Recommends periodic inspection for damage, cracks, or leaks, and prompt repair.

Scale Buildup Management

Advises on managing scale buildup, especially in hard water, and performing regular flushing.

Water Inlet Filter Cleaning

Details the maintenance task of cleaning the water inlet filter every six months.

Air Introduction in Plumbing Warning

Warns that introducing air requires purging before power-up to prevent element damage.

User Interface and Controls

Heater Power On;Off

Describes how to turn the water heater on and off using the control knob.

Adjusting Output Water Temperature

Guides users on adjusting the water temperature via the control knob and digital display.

Recommended Temperature Settings and Safety

Provides recommended temperature ranges and a caution against high settings.

Initial System Startup

First-Time Activation and Temp Setting

Outlines the steps for initial system startup and setting the desired output temperature.

Protecting Against Freezing Temperatures

Freeze Damage Prevention Measures

Advises on protecting the heater from freezing by maintaining low water flow without heating.

Troubleshooting Common Issues

No Hot Water; Display Off

Addresses issues with no hot water and a blank display, covering power and wiring problems.

No Hot Water; Display On

Covers no hot water with display active, including internal failures and reset procedures.

Water Not Hot Enough

Explains causes for insufficient hot water: flow, voltage, wiring, settings, pressure, thermal loss.

Troubleshooting Common Issues

Insufficient Water Heating

Details reasons for heated water being not hot enough, including voltage and flow rate issues.

Water Temperature Too High

Addresses excessively hot water, suggesting flow rate and temperature setting adjustments.

Heater Shuts Off Unexpectedly

Explains potential causes for the heater shutting off, such as overheating or power fluctuations.

Interrupted Water Flow

Covers issues where water flow stops, relating to blockages or pressure drops in pipes.

Variable Hot Water Temperature

Discusses causes for temperature fluctuations from hot to cold during water usage.

Resetting the Water Heater Unit

Unit Reset Procedure

Details the steps to reset the unit by pressing specific buttons after shutting off power.

Critical Reset Safety Warning

Provides a critical warning about the safety risks associated with the unit reset procedure.

Limited Warranty Information

Service, Repair, and Returns Policy

Outlines procedures for service, repairs, and returns, noting no returns to place of purchase.

Warranty Coverage Terms

Specifies warranty duration and coverage for original owners on workmanship, material, and leakage.

Warranty Void Conditions

Lists conditions that will void the warranty, including improper installation or misuse.

Atmor AT-910-24TP Specifications

General IconGeneral
BrandAtmor
ModelAT-910-24TP
CategoryWater Heater
LanguageEnglish

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