Learn more about Heat Meters, TRV’s and HCA’s

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apartments and houses connected to the Termokos network will be installed Free thermostatic valves!



There are 2 distinctive main types of central heating system installations in Multi-unit Buildings, which imply different technical design and metering arrangements; namely:

  • Vertical design of building’s central heating installation by which every radiator on the same unit / floor is connected to a different pair of vertical pipes, and as such there is no common supply point of the apartment. This is the common type and is found in the older buildings (83 %).
  • Horizontal central heating installation consisting of horizontal piping distributed in every floor usually in a form of a ‘star’ connecting separately each unit, thus enabling all radiators of a unit to be connected to one connection point.

2 types of unit-level heat metering devices are suitable respectively for each type of building’s central heating installations.

2. Heat Cost Allocator (HCA)

For horizontal central heating installation system will be installed heat meter in supply pipe routed into each apartment with manual shut-off valves before and after each heat meter. Heat meters are defined as the combination of: a temperature sensor pair, a flow sensor (e.g. impeller counter, ultrasonic flow sensor) and an energy calculator.

2. Heat Meters (HM)

Heat Cost Allocator (HCA) is most suitable metering device to be used for ‘vertical’ type of installations. HCA measures the heat transmitted by a radiator, thus by aggregating heat transmitted by all radiators of a unit it approximates the heat consumption of such unit.

It is more accurately described as an auxiliary device as it does not measure any physical parameters, but displays mathematical algorithms. They represent a proportional amount of the total heating consumption for the whole building. Individual Heat Meter is suitable for using in the case of ‘horizontal’ central heating installations. It is installed in the connection point entering a unit, and thus measures the entire thermal energy – heat – consumption of such unit. They are composed of a volumetric part integrated with two temperature sensors and a calculation unit.

3. Thermostatic Regulation Valve (TRV)

The dynamic Thermostatic Regulation Valve (TRV) allows the automatic adjustment of the radiators. The use of dynamic thermostatic valves in combination with thermostatic control heads makes it possible to keep the ambient temperature automatically constant, at the set value, in the room where they are installed, thus guaranteeing effective energy saving.

TRVs are just one of a number of heating controls, which allow homeowners to heat their homes more efficiently. They allow you to have different heating zones throughout the house, despite only one centralized boiler providing the heat.

The TRV is a self-regulating valve that works by changing the flow of hot water into a radiator. It consists of two parts, the valve head and the valve body, with the head sitting atop the body. When the room temperature changes, a capsule in the valve head contracts or expands, which moves a pin in the valve body causing it either to open or close. If it gets too warm in the room, expansion of the capsule will cause the pin to close the valve – slowing the movement of hot water into the radiator. Likewise, if the room drops in temperature, contraction of the capsule in the valve head pulls the pin out, allowing hot water to enter the radiator once more.

Installation of heat meters, heat cost allocators (HCA) and thermostatic valves (TRV) are free of charges and will be subsidized by the MCC/MFK project.