Technical knowledge centre
Specify with the numbers our engineers use.
A tubular element is a coil, compacted MgO, a metal sheath and two terminals. Its life is decided by a few values: watt density on the heated sheath, sheath alloy, cold zones and the terminal seal.
This centre collects the rules, master values and documents our engineering team applies when it reviews a drawing – grouped by what you need to do next. Values are typical ranges for a first design iteration; the final design is validated in our laboratory.
Engineering team
Design an element
From medium and power to a drawing we can quote.
Four routes, depending on how far your specification has got – from a blank sheet to a released drawing.
Design guide
Ten parameters, watt density by medium, sheath materials, terminations and EN 60335-1 test values.
Design parameters
Everything a buyer needs to specify on one sheet – with typical ranges and options.
Configurator
Seven guided steps turn your answers into a specification sheet and pre-fill the RFQ.
Co-design process
Concept, prototypes, validation, certification support and series – with one engineering team.
Check a value
Look it up before you calculate.
Master values for eight product groups, three calculators, the vocabulary of our drawings and the answers OEM projects ask for first.
Specifications by product group
The master table: diameters, sheath materials, power, voltage, watt density, terminals and standards.
Calculators
Watt density against the medium, Ohm's law with the power tolerance band, annual energy and CO₂.
Glossary
46 terms as they appear on our drawings and test reports – from cold zone to watt density.
FAQ
20 short answers on design, materials, approvals, samples, lead times and logistics.
Understand a technology
Four topics behind a long element life.
The background to several lines in our specifications.
Sealing
STF terminal sealing
Why the terminal end decides reliability, and how a multi-barrier seal keeps the MgO dry in hot, humid duty.
Surface
Nickel diffusion coating
A diffused nickel surface on stainless sheaths against corrosion and scale – a lower-cost option to Incoloy® 825 in hard water.
Heat treatment
Bright annealing
Restores ductility after rolling under a hydrogen-containing atmosphere – bright, scale-free, no pickling.
Efficiency
Energy efficiency
Where appliance energy really goes – coupling, heat-up, control, standby and cold-zone losses.
A question these pages do not answer?
Send the drawing or the application data. Our engineering team reviews it and proposes materials, geometry and test values for your appliance.