Boilers for district heating plants
TIPO Kotlogradnja hot water, warm water and steam boilers supply hot and warm water for district heating distribution networks, firing solid, liquid and gaseous fuels, including biomass.
Each boiler is designed and manufactured to the required capacity, process requirements, fuel type and operating conditions of the plant.
The role of boilers in district heating systems
A heating plant delivers heat to a distribution network, and the boilers in it can serve different roles. In many systems, combined heat and power and waste heat cover the base load, while boilers handle peak demand and act as a reserve if a source fails or the network is damaged. Such boilers run rarely, but they must be available at any moment and start reliably after long idle periods.
In systems without cogeneration, boilers are the primary heat source and run for most of the season. The requirements therefore differ: a base-load boiler is judged by continuous operation, a peak or reserve boiler by readiness and by how well it can change load. Boilers able to adjust output quickly under automatic control can also act as a fast reserve for the whole system. Hot water boilers and warm water boilers cover most of these duties, depending on the temperature regime of the network.
Regulations, standards and the condition of existing plants
A boiler for a heating plant is pressure equipment. In the European Union the Pressure Equipment Directive 2014/68/EU applies; it covers boilers, requires conformity assessment and CE marking, and divides responsibility between manufacturers, importers and distributors. Design and manufacture can follow the EN 12952 and EN 12953 series, and the investor should state in advance which set of rules and which delivery market apply. More on the standards and certificates page.
A large share of fuel-oil and coal plants in Europe operate beyond their design life, so replacement or modernisation has to be planned together with environmental requirements. The EU revised its energy efficiency and renewable energy directives in 2023, and both address district heating. In Serbia, conversion projects to biomass are presented as part of alignment with EU environmental rules in the accession process.
Fuel, decarbonisation and the move away from heavy fuel oil and coal
According to an overview by the CoolHeating project, district heating in Serbia relies predominantly on fossil fuels: natural gas, lignite or coal, and heavy fuel oil, with renewable sources playing a very small part. Replacing heavy fuel oil and coal with biomass therefore appears in regional programmes: in Serbia, biomass heating plants in several towns have been planned with EU and KfW support, and on the German-Polish border coal-based heating is being replaced by biomass-fired capacity.
Biomass is not the only route. Reviews of European district heating note that its potential for expansion is limited and that sustainability questions arise, and the revised EU Renewable Energy Directive (RED III) tightened the sustainability criteria for solid biomass. At the same time, heat pumps, electric boilers and industrial waste heat are gaining weight. A biomass boiler or an electric boiler is therefore usually designed as part of a mixed supply, not as the only source.
What the investor should define when choosing a boiler
Start with the role of the boiler in the system: base, peak or reserve load, and whether it remains a reserve once cogeneration, a heat pump or waste heat is introduced. Then define the network regime (hot or warm water), how the load is controlled and the required speed of load change. Then check the condition of the existing network and equipment to see what can be retained and what must be replaced, and how new equipment fits into the ongoing operation of the plant.
Fuel is a decision with long-term consequences. For biomass, check availability, quality and logistics, since local supply determines economic viability; for a reserve boiler, the ability to run on more than one fuel is valuable, as in some European systems. Water treatment, space in the boiler house and the option of rebuilding an existing boiler house should be settled at the start. Our engineering and retrofit services cover this stage.
- Role of the boiler: base, peak or reserve load
- Fuel, reserve fuel, storage and logistics
- Network regime and water treatment
- Standards, delivery market and documentation
- Available space and the option of changing fuel later
Boiler types for this industry
Hot water boilers
Hot water for industrial and energy systems and district heating. Shell and water-tube boilers for all common fuels.
View →
Warm water boilers
Warm water for building heating and process needs, from residential and public buildings to light industry.
View →
Industrial steam boilers
Saturated or superheated steam for industrial, process and power applications. Shell and water-tube boilers for solid fuel, biomass, liquid and gaseous fuel.
View →
Biomass boilers
A biomass boiler burns wood chips, pellets, sawdust, bark or straw to produce steam, hot or warm water from a renewable fuel, with lower fuel costs and CO₂ emissions.
View →Applications
Hot water boilers
- District heating
- hot water for urban and industrial heating networks
- District heating
- hot water for distribution networks
Industrial steam boilers
- District heating
- warm and hot water for distribution networks
Frequently asked questions
What is the difference between a hot water and a warm water boiler?
A hot water boiler produces pressurised water above 110 °C and is intended for district heating and industry; a warm water boiler works up to 110 °C and is used for building heating and processes with lower temperature requirements.
Where are hot water boilers most often used?
In urban and industrial district heating plants, energy centres, the chemical, food and paper industries, hospitals and large business complexes — wherever stable hot water for distribution networks is needed.
Shell or water-tube hot water boiler, which to choose?
A shell boiler (EN 12953) is the economical choice for small and medium capacities. A water-tube boiler (EN 12952) is chosen for higher outputs, higher temperatures and more demanding regimes, e.g. heating plants with large networks.
Can a hot water boiler run on biomass?
Yes. The MAG-V and RTPKT-V models are designed for wood chips, pellets, straw and other solid fuels, with automatic fuel feeding and de-ashing.
What equipment comes with a hot water boiler?
Circulation and recirculation pumps, expansion vessel, safety and control fittings, automation, an economiser where required, and water treatment. We can deliver the complete boiler house.
Can I replace an old heavy fuel oil boiler with a new warm water boiler?
Yes. Depending on the technical condition of the boiler, the existing boiler can be reconstructed and adapted for gas firing, which in some cases means replacing the burner and adapting the system. When reconstruction is not technically or economically justified, the heavy fuel oil boiler can be replaced with a new gas-fired warm water boiler, keeping part of the existing equipment and installations.
What is the purpose of reserve boilers in a heating plant if they rarely run?
They keep the network supplied when base-load sources fail or the network is damaged, and they cover the coldest peaks. European operators keep such boilers available at all times even though they run rarely, and often make them capable of burning more than one fuel. Capacity and reserve fuel follow from the operator's supply-security policy and are set in the design brief.
Do electric boilers have a place in district heating?
In European district heating, heat pumps and electric boilers play a growing role because they let solar and wind power feed into heat supply. Whether an electric boiler makes sense depends on the electrical connection and on the availability and price of electricity. TIPO Kotlogradnja manufactures electric boilers for steam, warm water and hot water.
What should be checked about biomass before choosing a biomass boiler?
The type, quality and origin of the fuel and the reliability of local supply, because local sourcing determines economic viability. In the EU, sustainability criteria for solid biomass under the revised Renewable Energy Directive (RED III) may also apply, so the origin of the fuel should be documented. Storage, feeding and ash removal are specified together with the boiler.
Standards we design and build to
TIPO Kotlogradnja designs and manufactures boilers and complete boiler plants according to the investor's requirements, fuel type, capacity and operating regime. The process covers requirement analysis, solution proposal, offer, design, material procurement, manufacturing, erection, testing and commissioning. Whatever the complexity of the project or the market, the equipment is designed and built to European and international standards, including EN 12952, EN 12953, EN 13445, EN 13480, ASME BPVC and AD 2000, in line with the project documentation and the investor's requirements.
Other industries
Have a project in mind?
Tell us your requirements and our team will review the project and propose the right technical solution.