Czech district heating: how hot water from a distant plant heats your flat

In September, in a Czech housing estate, a quiet ritual begins. Residents glance at the forecast and the radiators, and someone in the stairwell remarks that the heating has not started yet. In October it does, usually without warning, with a clank in the pipes and a faint smell of warm dust from the radiators. The system that makes this happen is older than most of the buildings it serves, and it shapes how millions of Czechs experience winter.

How the network works

District heating (centrální zásobování teplem, CZT, or simply dálkové teplo) is built on a simple idea: make heat in a few large plants, and send it to many buildings, instead of burning fuel in each cellar. The heat leaves the source as hot water, or in some older networks as steam, and travels through insulated pipes, the primary network, to the neighbourhood. There a heat exchange station (výměníková stanice), either serving a group of buildings or a single block, transfers the heat to a separate loop of water that circulates in the building's radiators. A second exchanger often heats the building's domestic hot water.

The two loops stay separate. The water in the street is not the water in your radiator. The exchanger passes only heat across, which allows the supplier and the building to control pressure and temperature independently.

Where the heat comes from

The sources differ by town. In many cases the heat is a by-product of electricity generation. A combined heat and power plant burns fuel to make electricity and uses the waste heat for the network, which makes better use of the fuel than producing electricity alone. Other sources include heating plants that produce only heat, waste-to-energy plants, biomass and, in some places, large heat pumps or industrial waste heat. The fuel mix has been changing for years, away from coal and toward gas, waste and biomass, and the direction of travel is toward lower emissions (as of 2026; check the supplier and the Ministry of Industry and Trade for the current mix in a given network).

Prague illustrates the scale. Its network draws on sources in and around the city, including a waste-to-energy plant at Malešice, and a long heat main brings hot water from a power station near Mělník to the capital (as of 2026; check the operator for the current arrangements). The point is that a flat in Prague can be heated by a plant outside the city limits, a reminder that the system is regional; see how Prague is governed for the city's own powers.

The heating season

The timetable is not left to chance. A government decree sets rules for heating and for the supply of hot water, covering when heating must start and stop and the temperatures that must be reached (as of 2026; check Decree No. 194/2007 Sb. on e-Sbírka). In summary, the heating season runs from 1 September to 31 May. Heating starts when the average outdoor temperature falls below 13 °C on two consecutive days and the forecast says it will not rise, and it can end when temperatures stay above that level. The decree also sets minimum indoor temperatures; check its current text for the values.

These rules apply to suppliers who heat buildings. They explain why heating can start in a cold September and why a warm spell in November does not necessarily switch it off. If the heating fails to start when the conditions are met, the owners' association or the tenant can complain to the supplier and, if needed, to the competent authority.

What controls you have

In the building, the household controls what the radiator emits, not what the system delivers. Most flats now have thermostatic valves on radiators, which let you set a temperature room by room, and heat cost allocators, small devices fixed to radiators that record relative consumption for billing. Where those are fitted, turning the radiator down saves money. The building as a whole can also be improved by balancing the system, insulating pipes and adjusting the exchange station's settings, decisions which belong to the owners' association.

A frequent mistake is to open windows to cool an overheated flat, wasting heat, when a thermostatic valve or the building's regulation would do the job. Another is to cover radiators with furniture or heavy curtains that block the warmth.

What the bill contains

The bill for district heating is divided in two ways. The supplier charges the building a price for the heat delivered, which usually has a fixed part, covering the capacity reserved, and a variable part, for the energy actually used. Inside the building, the total is divided among flats by a method set out by decree and chosen by the association: a share by floor area, a share by consumption read from the allocators, within allowed ranges (as of 2026; check the decree on the allocation of heat costs on e-Sbírka). Service charges and building funds shows how the annual settlement is built.

The supplier's price depends on its fuel and costs. The energy sector is overseen by the Energy Regulatory Office (ERÚ), which publishes rules and information, and the details of price rules and any caps should be checked with ERÚ and the Ministry of Industry and Trade (as of 2026). For a household, the practical consequence is that the building's insulation and the heat source's cost both drive the bill, and the household can influence only the part under its own radiators.

Strengths and criticism

Supporters of district heating point out that large plants can use fuels and technologies that would be impractical in each building, that cogeneration makes better use of fuel, and that cities can pursue decarbonisation by changing the source for everyone at once. Critics point out that residents have little say over the supplier, that some networks are old and lose heat in transit, and that prices have drawn complaints. Both views have evidence behind them, and which applies depends on the network.

Prague's flats, like those in other Czech cities, are strongly tied to the network. A buyer comparing a flat on district heating with one on individual gas should compare real bills from recent years instead of relying on general claims.

Frequently asked questions

When does the heating season start?

By decree it runs from 1 September to 31 May. Heating starts once the average outdoor temperature falls below 13 °C on two consecutive days and the forecast says it will not rise (as of 2026; check Decree No. 194/2007 Sb.).

Can I turn off the heating in my flat?

You can set your radiators with the valves. Disconnecting a flat from the building's system is a matter for the association and the supplier.

Why is my heating bill high when I use little?

A part of the cost is fixed and shared by area, and the building's losses are shared. Compare your bill with those of similar flats in the building.

Who regulates the price of heat?

The energy sector is overseen by the Energy Regulatory Office. Check its website and the Ministry of Industry and Trade for the current rules.

If your bill looks high, ask the association for the allocation method and the allocator readings before blaming the supplier. Other ways to heat a home are compared in Czech heating systems explained.