Why Steel Radiators Suit Extreme Cold Climates
Ulaanbaatar is the coldest capital city in the world: January nights reach −30…−40 °C and the heating season lasts 8–9 months. In such conditions a radiator is not a comfort question but a building reliability question. This article explains why steel radiators suit extreme cold, and how to size them using the 150 W/m² convention established in Mongolia.
What makes Mongolian heating conditions special
Three factors distinguish Mongolian systems from European ones. First, the temperature regime: district heating runs high-temperature water during the coldest spells, so radiators must withstand sustained thermal load. Second, pressure: working pressure in multi-storey district systems is high, with pressure tests and water hammer at the start of each season. Third, operating hours: heating runs three quarters of the year, so thermal cycling — repeated heating and cooling — far exceeds what radiators see on European markets.
Steel's advantages in extreme cold
Steel matches these three requirements precisely. Welded steel construction tolerates high temperatures without distortion and handles thermal cycling well. On pressure: JIUDING steel radiators are rated 1.0 MPa (10 bar) working pressure, and every unit is factory-tested at 1.5× working pressure — comfortably above the pressure tests of high-rise district systems. Structurally, wall thickness from 1.2 mm provides a corrosion reserve. Finally, steel delivers consistently high output: multi-column and panel designs radiate from a large surface within compact dimensions, which is effective at cutting the cold downdraught under windows.
Coating and corrosion protection
Because water quality in district systems varies, corrosion protection deserves particular attention. Two simple rules considerably extend a radiator's life: flush the system and fit a strainer before installation; and leave radiators filled with water during the off-season rather than drained — the internal surfaces of an empty radiator corrode faster in air. Externally, an electrostatically applied powder coating keeps its colour at high temperatures, is easy to clean and can be ordered in any RAL standard colour.
What 150 W/m² means
On the Mongolian market radiators are discussed not in watts but in heated area: 150 W/m² is the local design convention — on average 150 W of output per square metre of floor. That this exceeds the European 60–110 W/m² is no accident: outdoor design temperatures are far lower and building heat losses higher. Example: a 20 m² room needs 20 × 150 = 3000 W. If the chosen model delivers 150 W per section, you need 20 sections; at 200 W per section, 15. To simplify selection, JIUDING product pages show a heated-area column calculated at 150 W/m² alongside wattage for the Mongolian market.
Four things to check when selecting
One: add 10–15% to the baseline for corner and north-facing rooms, and likewise for large glazing. Two: connection type — decide in advance between side and bottom connection; bottom-connection models are common in new buildings with pipework concealed in the floor. Three: height — 300–600 mm models under windows create an air curtain, while 1500–1800 mm verticals deliver high output on narrow walls. Four: pressure documentation — always require factory test evidence from the supplier. You can check your calculation with our radiator calculator.
JIUDING on the Mongolian market: 5 years
JIUDING is now in its fifth year on the Mongolian market and holds roughly a 40% market share — meaning thousands of our radiators work through every winter in Ulaanbaatar's residential and public buildings. Our 45,000 m² factory in Tianjin runs 8 automated lines with an annual capacity of 4 million sections. Thermal performance is tested to the European EN 442 standard and quality management is certified to ISO 9001. Certificates and test reports are available on the credentials page and in the documentation centre.
For importers and construction project clients: send us your project's floor areas, storey count and connection type, and we will prepare a matching series and section calculation from over 600 specifications. Common questions are answered in the FAQ.