Heat cost allocators by QUNDIS.

QUNDIS heat cost allocators at a glance


QUNDIS is the market leader in the field of heat cost allocators. At our plant in Erfurt more than 4 million devices are produced and sold on the world market every year. Our speciality: metering accuracy. While heat cost allocators based on the evaporation principle have a measurement tolerance of up to 15 percent, the Q caloric technology (2-sensor models) ensures a maximum deviation of 2 percent.

Our electronic heat cost allocators represent the highest technological standards and offer the largest range of applications worldwide. Thanks to our comprehensive database of heat transfer values (KC values), the Q caloric model can be used on almost any radiator.

Due to the standardisation of the radio telegrams and the readout files, as a measurement service provider you offer your clients (house administrations, owners, etc.) the greatest possible independence (from devices, manufacturers, etc.).

In addition, you can offer tenants a high degree of transparency when measuring consumption, as they can also read the consumption according to the standard and product scale directly on the device themselves.

About the measurement method: With single-sensor models, our devices assume a fixed room temperature. Our extremely accurate 2-sensor models can include environmental factors such as solar radiation or hot spells in the billing because they record the room temperature separately. This allows the recording of heat consumption in the home to be even more consumption-based.

For assembly purposes QUNDIS offers you free of charge an extensive database with heat transition values (KC values) for almost any type of radiator. You can find these in our portal*


Works with all common radiators

our comprehensive KC values database covers almost every type of radiator on the market. Therefore, the Q caloric heat cost allocators can be applied with practically all radiators.

Read-out processes as required

Our heat cost allocators are available with or without radio function, as well as with or without infrared interface. This allows you to set up the readout processes according to your requirements.


Fast identification of attempted manipulation.

Further processing of data

Thanks to the standardised radio protocols and file formats, the consumption data can be easily exported and processed further by the standard billing programmes used by metering service providers.

Always ready for readout

Because the heat cost allocators are equipped with C-mode radio communication, the devices can also be read out in mobile form 365 days a year. Access to the apartment is not required.

Exact metering values

Thanks to the independent readout functions and a maximum measurement tolerance of 2 percent, QUNDIS heat cost allocators provide highly precise metering values.

More transparency

On request the Q caloric heat cost allocators offer a display of values according to standard or product scale. This gives end consumers a very transparent way of tracking their energy consumption on the basis of their bills.

Sales hotline
+49 361 26 280-0

We are there for you
Mo – Fr from
8 – 17 hrs.

Q caloric 5.5

Improved wireless transmission performance and flexible readout times

The new Q caloric 5.5 heat cost allocator enables an even simpler and more flexible readout of meters than before. Metering can be implemented both on site and in mobile form. The significantly greater wireless transmission range simplifies remote readout, improves data quality and cuts readout times.

The more flexible readout times are a further productive new feature. This means that metering services and housing companies are no longer tied to specific times of the year. As a result they have more flexibility in planning their recording of consumption data and the billing of energy costs. Meter reading can be implemented both on site and in mobile form, because parallel to walk-by wireless telegrams Q caloric 5.5 also sends AMR telegrams.

The benefits at a glance:

  • the launch of C-Mode doubles the wireless transmission range
  • readouts 365 days a year (in C-Mode)
  • parallel transmission of walk-by and AMR telegrams in line with the OMS standard (in C-Mode)
  • downward compatible with predecessor model Q caloric 5
  • no new heat transfer (kc) values required
  • no additional fitting requirement
  • upgrade to C-Mode and OMS possible in the field
  • no software adaptations required for existing S-Mode QUNDIS systems

Product flyer
(PDF file, 72 KB)

Data sheet
(PDF file, 420 KB)

What is a heat cost allocator?

A heat cost allocator measures the relative heat consumption share of a radiator. For this purpose it is attached directly to the respective radiator. The method of the metering process is to determine the temperature difference between radiator and room temperature. The actual energy consumption is then calculated using a conversion table with heat transfer values that exist separately for each radiator type.

To compensate for measurement inaccuracies, the heat cost allocators “know” the difference between summer and winter. Both the single and dual sensor models from QUNDIS offer you the most accurate metering values possible, depending on type.

The different types of heat cost allocator.

The various Q caloric heat cost allocators from QUNDIS differ in the number of their temperature sensors. Single-sensor models are simpler, as they do not record the room temperature separately, but are based on a fixed value. 2-sensor models measure the radiator temperature directly on the unit and the room temperature at the optimum location. This is why the 2-sensor models from Q caloric offer even more precise metering values. In addition, there are remote sensor models, with which the heat emission of very special radiator types or radiators which are difficult to access can be recorded.


How do we guarantee the start and stop times in our heating cost allocators?

In our device we always have the clock on winter time. This means that the set start time is suitable in winter, but one hour too late in summer.
Therefore, the start time for the whole year is set one hour earlier. On the other hand, the device transmits one hour longer in summer with the stop time set for winter.
Throughout the year we guarantee the start and stop times expected by the meter-reader, whereby one hour earlier in winter and one hour longer in summer.

Then there are the start and stop times and the reserves for watch tolerance of one hour each.
This ensures that the device clock does not deviate from the real time by more than one hour in 10 years.
By adding this tolerance to start and stop time, it is ensured that the devices transmit within the specified time window between start and stop time, even after 10 years.

What is the meaning of the numbers and symbols on the display of the electronic heat cost allocator?

A heat cost allocator with a unit scale only displays a value without a unit. The consumption value is only calculated using a formula.


Why does my heat cost allocator continue to count when the radiator is turned off?

Heat cost allocators only count when the temperature of the radiator is higher than the room temperature.

What’s the difference between one-sensor and two-sensor operation?

In 1-sensor operation a constant value is prescribed for the ambient temperature and only the radiator temperature is measured. In 2-sensor operation the actual difference between the ambient temperature and the radiator temperature is calculated. The measuring value is recorded via one (radiator) or two temperature sensors (radiator and ambient temperature sensor).

What’s the difference between the unit scale and the product scale?

In the case of the unit scale each heat cost allocator is programmed with the same K-values. When the bill is drawn up the displayed value is multiplied by the evaluation factors of the radiator, which are also calculated. The valuation factor depends on the heating output of the radiator, the type of radiator and type of assembly, details of which are printed on the bill. The total of the calculated values appear on the bill as a consumption unit. In the case of the product scale each heat cost allocator is already programmed with the K value for the radiator. The values displayed on the bill are the same as the values on the heat cost allocator.