Atmor thermoboost series

Questions and Answers

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Cameron BrownAug 10, 2025
Why is my Atmor thermoboost water not hot enough?
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  ipattersonAug 10, 2025
  There are several reasons why the water from your Atmor Thermostat might not be hot enough. It could be that the water flow rate is too high, exceeding the heater's capacity. Try reducing the water flow at the faucet or slightly closing the shutoff valve on the unit’s incoming water supply line. Alternatively, the temperature setting might be too low, so try increasing it. Finally, the water pressure might be less than 0.5 bar (7 psi). Ensure the shutoff valve is fully open and the water supply line isn't blocked.
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Charles VazquezAug 15, 2025
What to do if my Atmor Thermostat has no hot water?
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  Devin FloresAug 15, 2025
  If you're not getting any hot water from your Atmor Thermostat, even with the shutoff valve fully open, there could be a couple of reasons. First, check for a power outage or faulty wiring by examining the power supply and circuit breaker. Second, the flow rate needed to activate the heating element (0.5 gpm) might not have been reached. Try increasing the flow rate from the water supply source and cleaning the filter screen on the unit’s water inlet.
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Stephanie EvansAug 20, 2025
Why does my Atmor thermoboost keep shutting off?
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  Jessica SpencerAug 20, 2025
  If your Atmor Thermostat shuts off during use, it may be due to a power outage or faulty wiring. You should check the power supply and the circuit breaker.
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Paul BlackAug 25, 2025
What to do if Atmor Thermostat water stops flowing?
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  Walter KellyAug 26, 2025
  If the water stops flowing from your Atmor Thermostat, it could be due to a blockage in the water pipes or hoses, or simply no water supply. Ensure the main water line valve is fully open and that there are no obstructions in the water supply line.
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hoffmanryanAug 30, 2025
Why is my Atmor thermoboost water too hot?
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  Jeffrey PhillipsAug 30, 2025
  If the water from your Atmor Thermostat is too hot, it could be because the water flow rate through the heater is too slow. Try increasing the flow rate at the water outlet. Alternatively, the temperature setting might be too high, so try switching to a lower temperature setting.
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michaelmercadoSep 5, 2025
Why does the water temperature from my Atmor thermoboost vary from hot to cold?
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  xgoodSep 5, 2025
  If the water temperature from your Atmor Thermostat varies from hot to cold during use, it's likely that the water pressure has dropped below the minimum level. Try to increase the flow rate from the water supply source.

The Atmor ThermoBoost Series Digital Thermostatic 24kW is an electric tankless water heater designed to provide hot water on demand for residential use. This system heats water instantaneously as it flows through the unit, eliminating the need for a storage tank and offering greater energy efficiency compared to conventional tank heaters.

Function Description:

The ThermoBoost 24kW operates by detecting hot water demand when a faucet is turned on. High-power heating elements are activated, and integrated sensors continuously monitor water flow rate and both incoming and outgoing water temperatures. This data is transmitted to a system controller, which precisely determines the amount of power required by the heating elements to achieve and maintain the user-set temperature. Unlike traditional tank heaters that store and continuously heat water, this tankless system only consumes energy when hot water is actively being used, reducing standby heat loss. The unit is designed to deliver hot water at a lower, more comfortable temperature, often requiring little to no mixing with cold water. It can support multiple hot water outlets, though simultaneous use may be limited by the incoming water temperature, especially in colder climates. The digital thermostatic control allows users to set the desired output water temperature within a range of 90°F to 122°F (30°C to 50°C), with a recommended setting of 118°F (48°C) for optimal performance and safety.

Important Technical Specifications:

Heating Elements: 3
Watts: 24,000
Kilowatts: 24 kW
Voltage: 240 V
Circuit Breaker Amperage: 3 x 40 A
Breaker/Relay: 3 x double-pole
Total Connection Load: 100 A
Cable Size (minimum): 3 x 8 AWG
Minimum Water Flow to Activate Unit: 0.5 gpm
Working Pressure: 0.5–10 bar (7–145 psi)
Tested Pressure: 20 bar (290 psi)
Water Connections: 3/4" NPT
Physical Dimensions:
- Height: 13 3/8 in. (340 mm)
- Width: 17 3/8 in. (440 mm)
- Depth: 5 1/4 in. (135 mm)
Weight: 17 lbs (7.7 kg)
Flow Rate (gpm) vs. Temperature Rise (∆t °F) for 24kW:
- 2 gpm: 81°F
- 2.2 gpm: 74°F
- 2.5 gpm: 63°F
- 3 gpm: 54°F
- 3.6 gpm: 45°F
- 4.5 gpm: 36°F

Usage Features:

The ThermoBoost 24kW is designed for household and indoor use only. Installation requires a solid and secure mounting surface, with the unit installed in an upright position with water inlet and outlet at the bottom. It should not be installed above electrical boxes or junctions. The unit features a temperature setting knob and a digital temperature display for easy adjustment and monitoring. To activate the heater and display the outlet temperature, the knob is turned clockwise. The temperature can then be adjusted using UP or DOWN buttons. Before initial power-up, it is crucial to purge all air from the heater and water lines by running water through several hot water faucets for several minutes. Failure to do so can cause permanent damage to the heating elements. The system is designed to prevent scalding by recommending a maximum temperature setting of 118°F (48°C).

Maintenance Features:

While the water heater has no required routine maintenance procedures, periodic inspections and tests are recommended to ensure optimal performance and longevity.

Filter Cleaning: The filter should be cleaned once every six months.
Electrical Connections: Electrical connections should be tested annually by a qualified technician.
Plumbing Connections: Plumbing connections should be inspected at least once a year for signs of damage or failure.
Descaling: In areas with hard water (high mineralization), the water heater should be inspected and descaled more frequently to prevent scale buildup, which can occur faster at higher temperatures.
Air Purging: After any maintenance, water stoppage, or other interruptions that might introduce air into the plumbing system, the air must be purged from the unit before restoring power to prevent damage to the heating elements.
Freezing Protection: If ambient temperatures fall below 32°F (0°C), power to the unit should be shut off at the circuit breaker, and a faucet should be opened slightly to allow water to flow continuously through the device without heating, protecting it from potential freeze damage. If water is suspected to have frozen inside the unit, it must not be turned on until the ice has melted and no leaks are present.
Leak Detection: In case of a water leak, the water supply to the unit must be shut off at the incoming supply line valve, power to the heater must be turned off, and a local authorized distributor should be contacted for service.

The Atmor ThermoBoost 24kW is grounded and requires connection to a dedicated circuit breaker on the main electrical panel. Plumbing installation must precede electrical installation, using metal pipes or reinforced hoses rated for up to 8 bar and high temperatures. Copper pipes are recommended for the first three feet of the unit's water inlet and outlet. For installations on upper floors or in attics, local codes must be followed, including the installation of a drip pan with drainage or a leak detector and automatic shutoff valve.