Palm-sized
80 × 80 mm cross-section, 117–271 mm long depending on output. No boiler room, chimney or gas connection needed.
AT Modul product family
One heating module. Two kinds of control.
AT Modul Classic and AT Modul Smart both work with the same palm-sized, copper-bodied heating module: the same efficiency, the same lifetime, the same warranty. The difference is in the control. Classic is simple and proven; Smart has a touchscreen, WiFi, and you can reach it from anywhere with your phone.
- 99.4–99.7%thermal efficiency
- min. 25 yearsdesign life
- 20 yearsreplacement warranty on the module
- 4–12 kWin four outputs
The same heart beats in both
Whether you choose Classic or Smart, the heat is produced by the same heating module. The same copper body, the same heating elements, the same safety and the same warranty. We don't change, modify or cut corners on this with either type.
99.4–99.7% efficiency
According to measurements by the Brno Machine Industry Testing Institute (Strojírenský zkušební ústav), practically all of the electricity drawn is converted into heat.
Flow-through across the copper body
Thin-film heating elements on the copper body, with only 0.04–0.12 litres of water inside the unit. The water flows through and heats up instantly — there is barely anything to „warm up”.
Two-level factory protection
A 95 °C safety thermostat and a 115 °C thermal fuse on the copper body. Both are factory-set and cannot be altered.
It fits what you already have
Radiators, underfloor and wall heating, strip radiators, air heaters, fan coils (with a hydraulic separator), pools, domestic hot water with an indirect cylinder. Your existing pipework stays.
Both in all four outputs
4 kW (1 or 3 phase), 6 kW, 8 kW and 12 kW.
The same warranty
3-year warranty on the whole set, and a replacement warranty on the heating module that can be extended to 20 years under conditions. The control electronics carry 3 years with both types.
Made in Hungary
DM-Horizont Kft. has been manufacturing since 1997; both development and production happen at home.
The difference is in the control
The heating module is the same. What decides your choice is how much you want to see, set and follow of your heating — and from where.
Proven. Simple. Reliable.
AT Modul Classic
A two-display, button-operated controller built into the distribution box. Pre-programmed at the factory: you set the temperature you want and it does its job. No app, no internet, nothing to learn.
This is for you if you have one or two heating circuits and want to set the heating once, then forget about it.
AT Modul Classic in detailComparison table
This is where they differ
| Aspect | AT Modul Classic | AT Modul Smart |
|---|---|---|
| Heating module, output, efficiency | identical | |
| Interface | 2 numeric displays (red: measured, blue: set value), 2 buttons | 4" colour touchscreen, 3 views |
| Location of the controller | built into the distribution box | in a separate, purpose-designed enclosure — can be wall-mounted |
| Temperature sensors | 2 (boiler body, flow water) | up to 6 wired (2 built in + 2 supplied, expandable on request) |
| Room and DHW thermostat input | 1 | 2 (T1, T2) |
| Pump output | 1 | 2, controlled independently |
| Three-way valve control | yes | |
| Output control | two-position (on/off) control with an adjustable switching temperature difference | advanced algorithm, 3-step output control |
| Timer (several temperatures a day) | – (can be solved with an external programmable room thermostat) | easy to set on the web interface |
| Remote access | – | over WiFi, on the web interface, free of charge |
| Consumption metering and statistics | – | built-in current meter, graphical statistics |
| Fault signalling | error code on the display, audible signal | shown on the screen, e-mail notification to the owner and the service team |
| Remote diagnostics and settings | – | yes — the technician sees the status of the unit online if it is connected to the network |
| Operation without internet | yes (it doesn't even need it) | yes, fully functional locally |
| Later conversion | cannot be converted to Smart | – |
| Available outputs | 4 kW (1ph / 3ph), 6, 8, 12 kW | |
| Warranty | heating module: 3 years + up to 17 years replacement warranty; control electronics: 3 years | |
AT Modul Classic
Proven, simple, reliable
This is made for people who don't want to deal with their heating. The controller sits in the distribution box, arrives pre-programmed from the factory, a professional sets it once, and from then on you only touch it if you want a different temperature.
What can it do?
Two displays, one glance
On the left the copper heating body, on the right the flow water temperature. The measured value in red, the set value in blue, so you can see at once what the system is doing.
A red LED in the bottom right corner signals heat demand.
Two buttons
Temperature setting with the SET and C/F buttons, in a couple of seconds.
Everything one heating circuit needs
Room thermostat, domestic hot water sensor and flow switch inputs, plus circulation pump and three-way valve outputs.
Clear fault signalling
In case of a fault, an error code and an audible signal, so the installer quickly knows where to look.
Nothing superfluous
No app, no WiFi, nothing to update or forget.
New · AT Modul Smart
Your heating is in your hands even when you're not at home
The same heating module with smarter control: a 4-inch touchscreen, WiFi, a timer, consumption metering and remote assistance. Every function of the web interface is free of charge.
A touchscreen instead of buttons
The Smart controller arrives in a purpose-designed enclosure made only for this product. On the 4-inch colour touchscreen you see at a glance what is happening: whether there is a WiFi connection, whether the pump is running, whether the unit is heating and at which step.
You can choose from three views: one highlighted temperature in large, all measured temperatures at once, or only the values of the wireless sensors. One touch on the temperature and you can set it.
Several circuits, one controller
Underfloor heating and domestic hot water in one system? Smart handles up to six wired sensors, two independent pumps, a three-way valve and two room thermostats.
So the unit doesn't decide based on a single value, but sees the whole system. Besides the two built-in sensors, the set contains a 1-metre and a 2-metre additional sensor.
Set it from anywhere
Went away and left 24 degrees on? Not a problem.
Smart connects to the internet through your own WiFi network, so you can change it from anywhere on the web interface with a few clicks. You can also see the status of the unit, the measured temperatures, and you can name the sensors (for example „Living room”, „Cylinder”) so you always know what each one measures.
Timer: the house is warm when it needs to be
You can set several temperatures within a day, tied to times. For example 22 °C from 6 a.m.
on weekdays, and only 20 °C from 8 p.m. Smart switches on its own, you don't have to remember.
You can see how much you consume
Smart watches consumption with a built-in current meter. You can follow the data on a chart on the web interface, broken down by second or by hour.
That reveals when and how much you heat, and gives you something to adjust your settings to.
Help without a call-out
Tired of waiting days or weeks for someone to come out when there's trouble with the heating? With Smart, the service colleague sees the status of the unit over the internet, determines the cause of the fault, and in many cases fixes it remotely by changing settings — based on an e-mail report or a phone call.
If no part needs replacing, you save the call-out and its cost.
It tells you when something is wrong
If the controller software detects abnormal operation, it automatically sends an e-mail to you and to the service team. You often know about the fault before the flat gets cold.
Finer control
Smart tunes the output of the heating module in three steps with a more advanced algorithm, to match the heat actually needed. That means smoother operation, less load and gentler running for the whole system.
Fully functional without internet
WiFi is only needed for the remote functions. If the internet drops, or you never connect it at all, Smart works and controls locally from the touchscreen just the same.
Which one to choose? We'll help you decide
There is no „better” or „worse” type, only one that fits your house and the way you live better.
AT Modul Classic is the good choice if…
- you have one or two heating circuits (for example only radiators or only underfloor heating, or either one with an indirect DHW cylinder)
- you'd set the heating once and don't want to deal with it
- there is no WiFi where it will be installed, or you don't even want one
- you already have a programmable room thermostat and that's enough
- you're looking for the simplest, proven solution
Smart is the good choice if…
- you have several circuits, for example underfloor heating and a DHW cylinder with a three-way valve
- you want different temperatures at different times of the day, on a timer
- you heat a weekend house, holiday home or a rented flat and would like to keep an eye on it from a distance
- you want to know exactly how much your heating consumes
- it matters to you that in case of a fault you get help quickly, possibly without a call-out
If you're unsure, think ahead: the control of Classic cannot be converted to Smart later. On a professional consultation we help you decide which one fits your system.
What the set contains
AT Modul Classic set
- AT heating module in the chosen output, with a junction box
- Distribution box with miniature circuit breakers
- AT Modul Classic controller (2 displays, 2 buttons) built into the distribution box
- Temperature sensor probe
- User manual, Installer manual, warranty card
AT Modul Smart set
- AT heating module in the chosen output, with a junction box
- Distribution box with a main switch and miniature circuit breakers
- Smart controller with a 4" touchscreen, in a dedicated enclosure
- 1 m and 2 m additional sensors
- User manual, Installer manual, Smart controller manual, warranty card
Other items needed for installation (circulation pump, expansion vessel, safety valve, air vents, filter, dirt separator) are not part of the set.
Technical data
The data of the heating module are identical for both types.
| Parameter | 4 kW | 6 kW | 8 kW | 12 kW |
|---|---|---|---|---|
| Voltage / phase | 230 V 1f / 400 V 3f | 400 V 3f | 400 V 3f | 400 V 3f |
| Recommended heated area* | 50–70 m² | 70–90 m² | 90–130 m² | 130–180 m² |
| Minimum current demand | 1×18 A / 3×6 A | 3×9 A | 3×13 A | 3×18 A |
| Circuit breaker | 1×25 A / 3×10 A | 3×13 A | 3×16 A | 3×25 A |
| Supply cable | 5×1,5 mm² | 5×2,5 mm² | 5×2,5 mm² | 5×4 mm² |
| Size of the heating module | 80×80×117 mm | 80×80×144 mm | 80×80×212 mm | 80×80×271 mm |
| Installed length | 167 mm | 193 mm | 264 mm | 323 mm |
| Weight | 3,7 kg | 5,8 kg | 7,6 kg | 10,2 kg |
| Water volume in the unit | 0,04 l | 0,06 l | 0,08 l | 0,12 l |
| ΔT (temperature difference)** | 5–7 °C | 7–10 °C | 10–15 °C | 15–20 °C |
Shared parameters
| Efficiency | 99,4–99,7% |
|---|---|
| Water connection | 6/4" |
| Minimum flow | 800 l/h |
| Max. operating pressure | 6 bar (600 kPa) |
| Pressure test | |
| Temperature range | |
| Safety thermostat / thermal fuse | 95 °C / 115 °C, factory-fixed |
| Design life | min. 25 years |
| Conformity | CE: LVD 2014/35/EU, EMC 2014/30/EU, RoHS 2011/65/EU, WEEE 2012/19/EU |
The two controls
| Parameter | AT Modul Classic | AT Modul Smart |
|---|---|---|
| Interface | 2 LED displays, 2 buttons | 4" colour touchscreen |
| Sensor inputs | 2 | up to 6 wired + wireless |
| Room thermostat input | 1 | 2 (T1, T2; 5 V DC) |
| Pump output | 1 | 2 × 230 V AC, max. 5 A |
| Three-way valve output | yes | 230 V AC, max. 8 A |
| Max. settable boiler body temperature | 85 °C | 85 °C |
| Communication | – | WiFi (2.4 GHz) |
* The recommended heated area may vary depending on insulation and the design of the building. Use the calculator for the exact output.
** The temperature of the water leaving the unit depends on the mass flow.
A professional connects it, and you can count on it for 20 years
Both types are installed and commissioned by professionals: the water side by a building services engineer, the electrical side by a qualified electrician. After installation you register the unit, and if you document the annual inspection of the system, the replacement warranty on the heating module is extended from the basic 3 years to a total of 20 years. The control electronics carry a 3-year warranty.
Frequently asked questions
The heating module, the output, the efficiency and the warranty are identical. The difference is the control: Classic works with a two-display, button-operated controller, Smart with a touchscreen, WiFi, a timer, consumption metering and remote access.
Yes. Both types are available in 4 kW (1 or 3 phase), 6, 8 and 12 kW versions.
Yes. Every setting can be made locally on the touchscreen, and the controller regulates on its own. Internet is only needed for remote access, statistics and e-mail notifications.
A 2.4 GHz wireless network at the place of installation. The professional connects it during commissioning.
No. Every function of the web interface is free of charge.
Yes, even two.
Yes. The heating module carries a 3-year warranty and, under conditions, a replacement warranty for a total of 20 years; the control electronics carry a 3-year warranty.
If Smart is connected to the internet, the service colleague sees the status of the unit, determines the cause of the fault, and if no part needs replacing, often solves the problem by changing settings, without a call-out.
Let's talk through which one fits your house
Tell us how big your home is and what heating system you have. We'll help you choose the output and the control, and show you what will be needed for the connection.