Radiator 21VK 400 x 700 output 668W

Product detailed description

Steel radiator with bottom connection for central heating in family homes.

• Connections: Novello 4 x 1/2“
• Test pressure: 1,3 MPa
• Operating pressure: 1,0 MPa
• Heating medium temperature: hot water up to 110 C
• Product: Stelrad Softline Compact VK
• Type: 11/20/21/22/33
• Overall height: 300 – 900 mm
• Overall length: 400 – 3000 mm
• Overall depth: 61/77/100/158 mm
• Position of Novello bottom outlets: right/left / on request

The Compact Softline low-temperature heating body is made of fine cold-rolled sheet steel to EN442-1 quality, with side panels and a top grille as a compact unit with a vertical water channel spacing of 33.3 mm. The convector sheet is welded to the internal channels. Before painting, all radiators go through a multi-stage cleaning process, including phosphating with iron phosphate and a demineralised rinse. A primer coat is then applied, followed by a powder coat finish in Stelrad white 9016. Each radiator is packed in cardboard with sturdy corner protectors and in protective film. All bodies have brackets on the back. Quality is certified to EN ISO 9001. Heat output is verified to EN 442. Design complies with the BAGUV safety guidelines.

Frequently Asked Questions

• What output does this specific radiator have (400 x 700 mm, type 21VK)? This size and type version has a declared heat output of 668 W (according to EN 442, at the standard temperature gradient) - when choosing the correct radiator size, base your calculation on the calculated heat loss of the room in question.
• What does the type designation 21VK mean? The number before "K" (e.g. 11, 20, 21, 22, 33) indicates the structural type of the radiator - the number of radiator panels/plates and convector sheets in its construction; a higher number means more layers and therefore higher output at the same external dimensions. The letter "V" in the type designation means bottom connection (valve-compact) - the connections are located on the bottom edge of the radiator, which is particularly suitable for underfloor pipe routing without visible risers.
• What is the maximum operating pressure and temperature? The radiator is designed for an operating pressure of up to 1,0 MPa and a heating water temperature of up to 110 °C, with a test pressure of 1,3 MPa - typical domestic heating systems operate well below these values.
• What is the warranty on the radiator? The manufacturer provides a 10-year warranty on tightness and heat output from the date of manufacture, subject to professional installation, proper maintenance and operation - the warranty does not cover mechanical damage caused during transport, handling or improper installation.
• Must the installation be carried out by a professional? Yes, connecting the radiator to the heating system (single-pipe or two-pipe, with forced circulation) should be carried out by a heating engineer/installer, who will also ensure correct bleeding and balancing of the circuit.