Frequently Asked Questions

Radiator height is determined by available wall space below the window — standard installations leave 100–150 mm clearance to the floor and 50 mm to the window sill. Heights from 300 mm to 900 mm suit most residential windows. Taller models (600–900 mm) deliver more heat output per section without requiring a longer unit, making them ideal for rooms with limited wall width.

Length is selected to match the required heat output for your room. Calculate the room's heat loss (W) based on floor area, insulation, and climate, then match it to the radiator's rated output at your system's design temperature differential (ΔT). Jiuding steel panel and column radiators are rated to EN 442-2:2014, giving buyers verified output figures at standard ΔT50K and ΔT60K conditions.

Steel panel radiators (types 11, 21, 22, 33) use pressed-steel panels with convector fins for fast, efficient heat-up — typically 15–20 minutes. Multi-column radiators (JDDH series, 50×25 mm or 70×15 mm profiles) use a traditional column-fin structure suited to higher flow rates and decorative applications. Both are made from carbon steel with electrophoretic coating and are CE-certified to EN 442-1:2014.

Jiuding steel panel radiators (types 11/21/22/33) and the JDDH D/S 5025 column series are rated to a maximum operating pressure (MOP) of 1,000 kPa (10 bar). The JDDH 7015 column series and JDWY towel radiators are rated to 350–400 kPa. All products are tested to 1.3× MOP without leakage, as verified in the CE Declarations of Performance.

Large windows and poor insulation increase a room's heat loss, requiring a radiator with higher output. The standard approach: calculate total heat loss in watts (W/m² loss × floor area), then add 10–20% buffer. Jiuding offers 600+ specifications across 6 product series, so a matching output level is available for most residential and commercial applications without resorting to non-standard sizes.

Yes. Jiuding steel panel radiators are designed for hydronic central heating systems operating at supply temperatures from 45 °C to 90 °C. EN 442-2 thermal performance data provides output figures at multiple temperature differentials (ΔT30K, ΔT50K, ΔT60K), allowing accurate sizing for heat-pump-compatible low-temperature systems.

Column radiators rated to 350–400 kPa (JDDH 7015 series, JDWY towel models) are suitable for open or gravity-fed systems typically operating at 50–150 kPa. Steel panel radiators and JDDH 5025 column radiators rated to 1,000 kPa are over-specified for open systems but are fully compatible. Always verify the system's water pH (recommended 7–9) to prevent internal corrosion of steel components.

Jiuding holds CE Declarations of Performance under the EU Construction Products Regulation, assessed by a notified body to EN 442 (AVCP System 3), covering both the steel panel range (types 11/21/22/33) and the column and towel radiator series. Full DoP documents are available on request.

Yes. Jiuding radiators are GOST compliant for the Russia and Central Asia markets, alongside EN 442 compliance for Europe. Russia and the wider Central Asia region have been core export markets for Jiuding since the company was founded in 2002, and the relevant compliance documentation is available to partners on request.

EN 442 is the European (and UK-retained) standard covering requirements and testing for steel, cast iron, and aluminium radiators used in water-based central heating systems. EN 442-1 defines dimensional and safety requirements (working pressure, surface temperature, coating); EN 442-2 defines the standardised thermal output test method. A CE Declaration of Performance under EN 442-1 means an independent notified body has verified the product meets these criteria — it is legally required for sale in EU member states.

Yes. All CE-certified Jiuding products have been tested for SVHC (Substances of Very High Concern) under the REACH Regulation, confirming no release of dangerous substances. REACH/SVHC compliance is referenced in the CE Declarations of Performance as part of the CPR technical assessment.

All CE-certified Jiuding radiators — column, panel, and towel models — achieve reaction-to-fire class A1 (non-combustible) under EN 13501-1. A1 is the highest classification and is a requirement in many commercial, public-sector, and high-rise residential building projects in Europe.

Yes. Jiuding holds ISO 9001:2015 Quality Management System certification and ISO 14001:2015 Environmental Management System certification. The scope covers the manufacture and service of steel panel and column radiators at the Tianjin facility.

Yes. Jiuding steel panel radiators (types 11/21/22/33) and JDDH column series are certified to Russian GOST standards (GOST R), assessed against ГОСТ 31311-2022 and EN 442-1/2. Russia and the wider CIS region have been primary export markets for Jiuding since the company was founded in 2002.

Jiuding manufactures 6 product series covering over 600 specifications: steel panel radiators (types 11, 21, 22, 33), multi-column radiators (JDDH D and S series in 50×25 mm and 70×15 mm profiles), and towel radiators (JDWY series). Heights range from 300 mm to 1,800 mm; widths from 400 mm to 3,000 mm depending on series. Both standard and custom dimensions are available for OEM/ODM orders.

Jiuding steel panel radiators (types 11/21/22/33) and JDDH 5025 column models have a maximum operating pressure (MOP) of 1,000 kPa (10 bar) and are pressure-tested at 1,300 kPa (13 bar, 1.3× MOP) without leakage, as required by EN 442-1:2014. The JDDH 7015 column series is rated to 350 kPa MOP; JDWY towel models to 350–1,000 kPa depending on model.

The maximum surface temperature of all CE-certified Jiuding radiators is 100 °C (measured at standard test conditions per EN 442-1:2014). At typical residential operating temperatures (60–70 °C supply), surface temperatures are significantly lower. For environments with children, Jiuding recommends pairing with TRV (thermostatic radiator valve) controls and optional decorative radiator covers, both of which are compatible with all panel and column models.

Jiuding steel panel and column radiators use electrophoretic (e-coat) primer followed by a polyester powder topcoat. Coating adhesion tests to ISO 2409:2013 achieve a result of 1c–0 (highest adhesion class), as documented in all CE Declaration of Performance reports. Corrosion resistance is confirmed by 100-hour humidity testing per EN 442-1:2014 with no corrosion observed. Standard finish is white (RAL 9016); grey and black are available on request.

All CE-certified Jiuding radiators are tested at inlet water temperature of 100 °C per EN 442-1:2014, and are designed for standard district heating and central heating systems operating between 60 °C and 90 °C supply temperature. For systems operating above 90 °C, confirm compatibility with the specific model's MOP rating and consult Jiuding's technical team for appropriate valve and fitting specifications.