Hot water Air Heaters for Industry

 Doll hot water-register air heaters of the type-series WDA (Warmwater-Doll-Automatic) have been approved for application in commercially used rooms of all kinds, most notably also in very high rooms. 

Due to the extremly solid and robust construction, these systems are preferably used in industry and workshop halls, greenhouses, warehouses, car repair shops and machine factories.

The casings are serially made of fully zinc-coated steel platings (lacquering in RAL-colors on demand available for an extra charge). 

The devices are designed for high performance air-throughput and long durability, also under hindered conditions of usage in commercial premises, in which the air is additionally charged with dust and humidity. Core piece of the device here is a high-grade heat register in completions CuAl, steel zinc-coated or stainless-steel. The ventilator components are carried out as two step special ventilators as external rotors from a market leading German manufacturer. The motor in this type of construction is encapsulated and protected from humidity and dust and safely integrated in the ventilation rotor. Before assembly, the ventilators are balanced statically and dynamically for smooth running at high performance air-throughput and for a long durability. By application of the comprehensive accessories programme, these devices are capable being wall  or ceiling mounted as well as for recirculating-, fresh- or mixed-air operation.

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  • wall  or ceiling mounting capable - rugged industry completion for halls, workshops and washing bays.
  • operation with no exhaust line attached or ventilation engineering measured compatible hot air hose. 
  • high-grade heating register in copper aluminium, steel zinc-coated or stainless steel completion for all common supply temperatures.
  • in copper-aluminium heating register completion serially equipped with persistent aluminium fins and collector tubes made of steel for improved cold resistance!
  • special external rotor axial fan, motor protected from humidity and dust made of aluminium diecasting.
  • high performance air-throughput at lowest acoustic emissions, in 2-step-switchable completion or if demanded 5-step-switchable completion.
  • air outlet grids with adjustable air-steering fins / special blow out versions available depending on conditions in the greenhouse and specific cultivations.
  • specific blow out variants available depending on building conditions and utilisation of the air heaters.
  • terminal box serially attached on the casing outside - ready to use.


We are gladly submitting you a project specific offer for your individual requirements.

Doll-WDA devices are German TÜV / GS audited and certified. The devices comply with the requirements of the EU machinery directive and are incorporating the CE-sign.

Industriegebiet Schlattwiesen | 72116 Mössingen | Tel: +49 (0)7473 - 77 11 | Fax:+49 (0)7473 - 23 778