Technical and economic analysis of heat cost allocators

A heat cost allocator does not measure thermal energy in kWh or GJ. It is part of a building’s cost-allocation system, so an assessment of its use should not begin with the device price or with the question of whether “residents’ bills will fall”. The first step is to examine the heating system layout, the technical condition of the building, the ability to control heating, the cost-allocation method and data on actual heat consumption. Only then can the technical assessment and five-year economic analysis required in specified cases be carried out.

Energy Trend prepares such studies for owners and managers of multi-unit buildings, including housing communities and housing cooperatives. The result is intended to provide a practical basis for a decision: use heat cost allocators, use apartment heat meters, first remove identified technical barriers, or adopt another permitted allocation method.

What should the technical and economic analysis actually determine?

A reliable analysis is not limited to saying “heat cost allocators are cost-effective” or “heat cost allocators are not cost-effective”. It should address four issues in sequence:

1. Does the heating system layout allow the selected method of individual cost allocation to be used correctly? In particular, it must be determined whether heat is supplied to the apartment through a single connection point or whether the radiators are supplied from multiple risers.
2. Are the technical conditions required for the planned solution met? Relevant factors include thermostatic radiator valves, the condition of the heating system and heat substation, the building’s characteristics and the thermal modernisation measures already carried out.
3. Is the five-year relationship between projected energy savings and the costs of purchasing, installing and operating the devices favourable? The calculation should be based on actual building data and consumption-dependent costs, not merely on the total value of the heat bill.
4. Can the allocation method be designed and applied correctly? A system using heat cost allocators must account, among other things, for adjustment factors reflecting the location of apartments and for the ability to determine the minimum and maximum variable cost for each apartment.

From an auditor’s perspective, the sequence matters. The building and heating system should be assessed first, and device quotations compared only afterwards. The fact that a heat cost allocator can physically be mounted on a radiator does not in itself establish that the entire system is technically correct or cost-effective.

Heat cost allocator vs heat meter — these are not the same type of measurement

Poland’s Central Office of Measures clearly states that a heat cost allocator does not measure any physical quantity, including heat. Its indication depends, among other things, on the temperature of the radiator surface at the installation point and the period during which the radiator emits heat. This means that the raw number of allocator units cannot be treated as an energy reading in kWh or GJ, nor can a single universal conversion factor be applied independently of the allocation system.

This distinction is also important in the economic analysis. The purpose is not to prove that the device will “measure the savings”, but to assess whether an individual cost-allocation system can lead to projected energy savings that justify its cost.

When do Polish regulations require a technical and economic assessment?

Under Polish Energy Law, this requirement applies to buildings with water-based heating systems supplied from a district heating network and to buildings with more than one dwelling or commercial unit supplied from a boiler room. In such buildings, devices enabling individual allocation of heating costs — heat meters or remotely readable heat cost allocators — are used where technically feasible and cost-effective. The assessment takes into account, among other things, how heat is supplied to the units, the ability to control radiators, heat substations, the extent of thermal modernisation, and device costs in relation to planned energy savings.

Detailed criteria are set out in the Polish Regulation of the Minister of Climate and Environment of 7 December 2021:

• where an apartment’s heating system has a single-point supply to all radiators, the regulations provide for a route based on remotely readable heat meters;
• where the heating system does not meet the single-point supply condition, the regulation provides for the use of remotely readable heat cost allocators, provided that all technical and economic requirements set out in § 5 are met;
• for a new installation of devices, the economic analysis is carried out for a five-year period and must demonstrate that the projected energy savings exceed the cost of purchasing, installing and operating the devices.

This does not mean, however, that every housing community or cooperative that already has heat cost allocators must now repeat the analysis under §§ 3–5. Section 11 of the regulation excludes the application of those provisions to buildings that, on the date the regulation entered into force, were already equipped with heat meters or heat cost allocators enabling individual allocation of heating costs, regardless of whether the devices had remote-reading capability at that time.

Remote reading is a separate issue. Under Article 16 of the Polish amending act of 20 April 2021, devices installed before that amendment entered into force must be replaced with devices with remote-reading capability by 1 January 2027. For an existing system, its legal and technical status should therefore be established first, and only then should the actual scope of the required analysis be determined.

What data are needed for a reliable analysis?

The data set should make it possible to reconstruct both how heat flows through the building and how costs arise. In practice, we analyse at least the following groups of information.

A complete set of documentation is not always required at the outset. At the first stage, data gaps can be identified and it can be determined which of them are critical to the technical or economic conclusions.

What does the technical analysis of heat cost allocators involve?

1. How heat is supplied to the unit

The first step is to identify the system topology. If all radiators in a unit are supplied through a single entry point, the feasibility of using an apartment heat meter should be assessed first. If several risers enter the unit and individual radiators are connected to them independently, conventional metering at a single unit entry point is not possible without modifying the system; heat cost allocators are then considered.

In practice, the statement “the system is vertical” is not enough. The actual pipework arrangement and the way the units are supplied must be checked, especially after previous renovations.

2. Radiators, valves and controllability

The analysis includes an inventory of radiators and control devices. Relevant factors include compatibility of the radiator type with the selected heat cost allocator system, the possibility of correct installation, the parameters required to configure the devices, and the presence of elements that may hinder interpretation of readings, such as unusual radiator enclosures.

For a new installation of heat cost allocators, § 5 of the Polish regulation also requires valves with thermostatic heads on radiators in the units. Installing a cost-allocation device without a reasonable means of controlling heat output is inconsistent with the logic of this solution.

3. Risers, pipework and heat not recorded by heat cost allocators

A heat cost allocator records the operating conditions of a specific radiator, but a unit may also contain risers and pipes that release heat directly into the rooms. Some heat may also pass between units through building partitions.

Very low heat cost allocator readings therefore do not mean zero energy consumption for heating the unit. The analysis should identify the scale of these effects and verify that the proposed allocation method does not assign raw readings a technical meaning they do not have.

4. Building condition, thermal modernisation and unit location

Polish Energy Law explicitly lists the extent of thermal modernisation as one of the factors to be considered when assessing technical feasibility and cost-effectiveness. There is a practical reason: a corner unit, a top-floor unit or a unit above an unheated space has different heat losses from an internal unit, even with a similar floor area and use pattern.

A method based on heat cost allocators should therefore include adjustment factors reflecting the unit’s position within the building envelope. If the building has been partially insulated, windows or doors have been replaced, or further thermal modernisation is planned, it should be verified whether the existing factors and assumptions still reflect the building’s current characteristics.

5. Heat consumption and the threshold under Article 45a(13)

For a new installation of devices, the Polish regulation requires the amount of heat supplied to the building not to exceed the values specified in Article 45a(13) of Polish Energy Law. The Act sets a threshold of 0.40 GJ per m³ of heated building volume over 12 consecutive months and 0.30 GJ per m³ of domestic hot water prepared.

If the threshold is exceeded, the owner or manager carries out an energy audit of the building to identify the causes of excessive energy intensity and ways to reduce heat consumption or change the contracted heat capacity. The heat balance of the entire building should therefore not be omitted from an analysis of heat cost allocators.

6. Can the cost-allocation method be applied correctly?

The regulation requires a method using heat cost allocators to make it possible, for each heating season, to determine the maximum and minimum consumption-dependent variable cost for a unit. The maximum is linked to the technical capacity to supply heat to the unit, while the minimum corresponds to the amount of heat required to maintain the specified design temperatures.

This means the analysis does not end with installing the equipment. It is also necessary to assess whether the manager has the technical basis and data required to establish allocation rules consistent with these principles.

What should a five-year cost-effectiveness analysis look like?

The regulations specify a five-year horizon but do not prescribe one universal percentage saving for every building. Calculations should therefore be transparent and based on data for the specific property.

Step 1. Establish the baseline energy use

First, heat consumption for space heating in the baseline period should be determined. If several heating seasons are available, their representativeness, the extent of thermal modernisation, changes in outdoor temperatures and the method used to separate heat for domestic hot water should be reviewed.

Step 2. Estimate projected energy savings

Savings should relate to energy consumption that can actually be avoided through behavioural changes and improved control supported by individual cost allocation. Shifting part of the cost from one unit to another is not an energy saving for the building.

Any assumed percentage reduction in consumption requires justification. If the data do not support one reliable scenario, it is better to present a conservative, base and higher scenario and determine the savings level at which the investment reaches the cost-effectiveness threshold.

Step 3. Value the savings against the correct cost component

Not every złoty on a heat bill will fall in proportion to a reduction in GJ. The analysis should separate charges that depend on the amount of heat consumed from fixed charges, contracted capacity and other items that may remain unchanged without additional measures.

Step 4. Account for the full system cost over 5 years

The cost should include not only device purchases but also installation, configuration, commissioning, readings, billing support, servicing and other foreseeable operating costs over the five-year analysis period.

Calculation example — illustrative data only

Assume that the following have been estimated for a building over five years:

• projected energy savings: 220 GJ,
• avoidable variable cost: 180 zł/GJ,
• purchase, installation and commissioning of the system: 28 000 zł,
• reading, administration and operation over 5 years: 15 000 zł.

In this simplified scenario, the value of the projected savings is:

220 GJ × 180 zł/GJ = 39 600 zł

Total system cost:

28 000 zł + 15 000 zł = 43 000 zł

In this scenario, 39 600 zł < 43 000 zł, so the economic condition is not met. If, at the same costs, a justified projected saving were 280 GJ, its value would be 50 400 zł and the economic result would be positive.

The example shows why neither the purchase price of heat cost allocators nor the average heating bill is sufficient on its own. A real study should use data for the specific building, current tariff conditions and the costs of the specific system, and should include sensitivity analysis of the key assumptions.

Fixed and variable costs — why are heat cost allocator readings alone not enough?

Polish Energy Law distinguishes how different groups of costs are allocated. Fixed costs of heat supply for central heating, together with the cost of heating common areas, are allocated in proportion to the floor area or volume of the units. In turn, part of the cost of heating individual units may be allocated on the basis of heat-meter or heat cost allocator readings.

There is no single statutory, universal split such as “30% fixed costs and 70% variable costs” that must be used in every building. The analysis should first identify the actual structure of heat-purchase costs and the rules in the applicable internal allocation regulations, and only then assess the effect of heat cost allocators.

This is also important economically. If a large share of a building’s costs is fixed, energy savings will not automatically produce a proportional reduction in the total amount billed. Additional savings may, for example, require a later adjustment of contracted capacity where justified by the data and by the terms of the supplier contract.

After selecting the method: internal rules, access to devices and information obligations

A positive analysis result does not end the owner’s or manager’s obligations. If an individual heat cost-allocation method is selected, it must still be translated into rules that can actually be applied in the building.

Polish Energy Law requires the owner or manager to select a method for allocating heat-purchase costs and introduce it in the form of internal allocation rules. The rules must be communicated to users of the units within 14 days from the date they are brought into use. If the method uses heat cost allocator readings, the rules should also allow an alternative calculation based on the floor area or volume of the unit and specify the conditions for using that alternative.

Where the method uses individual devices, the user of a unit is required to allow their installation or replacement and subsequently permit inspection and reading. From a project perspective, this means that before implementation it is worth checking not only the devices but also the system operating procedure and the complete set of data required for billing.

The owner or manager also has information obligations. Information on the allocation of heat-purchase costs must be provided to users free of charge at least once a year; where billing is based on the devices referred to in Article 45a(7)(2) of Polish Energy Law, users must be able to obtain information on heat consumption free of charge once a month. The detailed scope of data in settlements and monthly information is set out in §§ 9 and 10 of the Polish regulation of 7 December 2021.

The President of the Polish Energy Regulatory Office (URE) may require the owner or manager to provide documents and information concerning the equipment in the units, the use of consumption-based allocation and compliance with information obligations. The analysis result should therefore be capable of being translated into documentation, allocation rules and a practical operating method for the system — not merely into a decision to purchase devices.

Unit location and building characteristics matter

Two apartments with the same floor area do not necessarily have the same heat demand. An internal apartment may benefit from heat transferred from neighbouring units, while a corner or top-floor apartment has a larger area of external partitions and greater heat losses.

The regulation therefore requires adjustment factors reflecting the position of the unit within the building envelope. At a minimum, the analysis should examine:

• division of units into zones with different locations,
• external partitions and contact with unheated spaces,
• the effect of completed thermal modernisation,
• changes to the building form or use,
• consistency of the adopted factors with the building’s current condition.

An adjustment factor does not turn a heat cost allocator into a heat meter. Its purpose is to correct the effect of conditions outside the user’s control on the allocation result.

Limits when interpreting heat cost allocator readings

When assessing the system, several technical principles should be adopted:

• an allocator unit is not a kWh or GJ;
• a very low number of units does not mean that the unit received no heat from risers, neighbouring rooms or building partitions;
• readings require the device to be correctly configured for the radiator type and parameters, and the rules appropriate to the particular system must be followed;
• raw units from different systems or different configuration methods should not be compared directly;
• a heat cost allocator is part of the cost-allocation method, not a stand-alone device that determines the unit’s total energy consumption.

For this reason, the technical study should cover not only the device itself but the entire chain: building → heating system → radiator → heat cost allocator → factors → allocation rules → cost structure.

When can the analysis result be negative or conditional?

The analysis should not assume in advance that heat cost allocators will be implemented. It may point to a different course of action, for example where:

• the unit has a single-point supply to all radiators and an apartment heat meter is the more technically appropriate solution;
• the required radiator control using valves with thermostatic heads is missing;
• the condition of the heat substation or heating system does not meet the requirements for the planned solution;
• heat consumption exceeds the threshold under Article 45a(13), so an energy audit of the building is required first;
• radiators, risers or parameters needed to configure the system cannot be inventoried reliably;
• planned thermal modernisation will materially change the heat balance in the near term, meaning the current assumptions should be treated as transitional;
• the allocation method does not allow adjustment factors to be applied correctly or the required variable-cost limits to be determined;
• the five-year value of projected savings does not exceed the costs of purchasing, installing and operating the system;
• the building already has a system covered by the transitional provision, and the actual need is primarily to assess replacement with remotely readable devices before 1 January 2027.

A result of “conditionally feasible” can be more useful than a simple “yes”. It identifies what must be done before devices are purchased so that the system works technically and provides a basis for correct billing.

What does the building owner or manager receive?

The scope of an Energy Trend study is tailored to the building’s situation, but the final report may include:

• a description of the existing condition and the method of heat cost allocation,
• an assessment of the technical feasibility of using heat meters or heat cost allocators,
• identification of unmet conditions and measures required before implementation,
• a check of heat consumption against Article 45a(13),
• an assessment of how unit location, risers and building characteristics affect the allocation method,
• a five-year economic analysis with transparent assumptions, costs and projected energy savings,
• alternative scenarios and sensitivity analysis where the result depends on uncertain data,
• an indication of whether the recommended route is heat cost allocators, heat meters, preparatory measures or another permitted method,
• an indication of the requirements to be reflected in the internal allocation rules and in the organisation of information obligations,
• conclusions for use in management decisions, budget planning, procurement preparation or updates to the allocation rules.

The study should not replace the internal allocation rules with a one-line answer of “install / do not install”. Its value lies in documenting why a particular option is technically feasible and economically justified, or why it does not meet the required conditions.

What does working with Energy Trend look like?

1. Initial data review — we collect documents on the building, heating system, consumption and costs and identify missing information.
2. Technical analysis — we verify the system layout, radiators, risers, controllability, condition of the heat substation, building characteristics and planned changes; where necessary, the scope includes a site inspection.
3. Cost and scenario analysis — we compare projected energy savings with the full system cost over five years and test the sensitivity of the result.
4. Report and decision — we present conclusions, boundary conditions and the recommended next steps.

To start the analysis, the following are particularly helpful: invoices or a heat-consumption summary for at least 12 months, a space-heating system diagram, basic building data, the current internal allocation rules, information on radiators and valves, and a system quotation if one is already available.

Frequently asked questions

Are heat cost allocators mandatory?

There is no universal “yes” for every building. In buildings covered by Article 45a(7a) of Polish Energy Law, devices enabling individual cost allocation are used where technically feasible and cost-effective, and the choice between a heat meter and a heat cost allocator depends, among other things, on the system layout. In addition, § 11 contains a transitional provision for systems that already existed when the regulation entered into force.

Does a heat cost allocator measure heat consumption in kWh or GJ?

No. According to Poland’s Central Office of Measures, a heat cost allocator is not a measuring instrument and does not measure thermal energy. It records dimensionless units that are used together with the complete allocation system to distribute part of the heating costs.

Is an economic analysis always required for existing heat cost allocators?

No. First, it must be established when the devices were installed and whether, on the date the regulation entered into force, the building was already equipped with a system enabling individual allocation. Section 11 excludes the application of §§ 3–5 to such buildings. A new system is assessed differently, as the regulation specifies a five-year economic analysis for new installations.

What must be done with devices without remote reading before 1 January 2027?

The Polish amending act of 20 April 2021 provides that, by 1 January 2027, the owner or manager of a multi-unit building must replace the devices referred to in Article 16 of that act, installed before the amendment entered into force, with devices having remote-reading capability. The required scope of work should be determined on the basis of the installation date and documentation of the existing system.

When can heating costs be allocated by floor area or volume?

Polish Energy Law provides for this method for the heating costs of individual units where the use of heat meters or heat cost allocators is technically infeasible or not cost-effective. Independently of this, floor area or volume is also used to allocate the fixed costs of heat supply for central heating in accordance with the rules set out in Article 45a.

Are adjustment factors for unit location necessary?

Yes. The regulation requires the selected method to account for heat-consumption adjustment factors resulting from the unit’s position within the building envelope. Their purpose is to reduce the effect of differences in heat demand arising from building characteristics rather than user behaviour.

Does installing heat cost allocators complete the owner’s or manager’s obligations?

No. The selected method must be introduced in the internal allocation rules and, where heat cost allocators are used, the rules should also define the conditions for alternative allocation by floor area or volume. The owner or manager also has obligations concerning access to devices, provision of settlements at least once a year and — in the cases specified in Article 45c(2) of Polish Energy Law — enabling access to consumption information once a month.

Legal and technical sources

The legal position was verified as at 20 August 2026 on the basis of primary sources:

• Polish Energy Law — current consolidated text, ELI
• Regulation of the Polish Minister of Climate and Environment of 7 December 2021 — ELI
• Act of 20 April 2021 — provision on remote reading by 1 January 2027, ELI
• Poland’s Central Office of Measures — information on heat cost allocators

Do you need a decision supported by technical and economic evidence?

If you are considering introducing heat cost allocators, replacing an existing system or verifying the basis for selecting a heating-cost allocation method, send us the basic building data and the planned scope of the change. On this basis, we will identify the information required to prepare the analysis.

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