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Home›Steaming methods›Sandwich Steaming

Steam directly moving downwards!

Sandwich-type steaming is the most effective and energy-efficient surface steaming method. In this further development of the hood steaming method, the hot steam penetrates deeper into the soil.

The steam is led under the hood via a number of hollow pins, each of which has several exit holes. These pins penetrate the soil up to a 25cm depth.

Soil temperature of more than 85°C can be achieved under the covered surface very evenly and quickly with this method. Sandwich-type steaming is efficient for soil depths between 10 and 25cm.

Energy consumption

The energy consumption is very low due to the shorter steaming time, which is radically reduced because of the deep penetration of the hot steam.

At 25cm steaming depth, you can count on heating oil consumption of merely 0.6 litres per square metre to reach up to 85°C depth temperature within just five minutes.

At steaming depths beginning from 10cm, sandwich-type steaming saves about 35% in energy compared with normal hood steaming.The energy consumption is very low due to the shorter steaming time, which is radically reduced because of the deep penetration of the hot steam.

At 25cm steaming depth, you can count on heating oil consumption of merely 0.6 litres per square metre to reach up to 85°C depth temperature within just five minutes.

At steaming depths beginning from 10cm, sandwich-type steaming saves about 35% in energy compared with normal hood steaming.

Manually handable steaming hood with 25cm long spikes Manually handable steaming hood with 25cm long spikes
Special spike hood constructed for steaming substrate directly in flower pots Special spike hood constructed for steaming substrate directly in flower pots
Spike hood, moved by a mini excavator Spike hood, moved by a mini excavator
Steaming robot type Steaming robot type "Sterilter" with spike hood
Steam boiler_fully automatic_sterilter_sandwich_outdoor Steam boiler_fully automatic_sterilter_sandwich_outdoor

Know how! Tips and tricks

When using spiked hoods, the same standard values as for hood steaming are largely applicable.

The important difference is that more than double the quantity of steam per square metre comes under the hood due to the hollow spikes. This requires generation of a slightly higher surface pressure. Such pressure can, however, mostly be provided by the weight of the device itself. Furthermore, moving a spiked hood is a slightly more complicated process since you have to check that the hollow pins have smoothly penetrated into the soil when being lowered.

In this steaming system, you must ensure that the soil is sufficiently dry in order to keep the exit holes clean.

Moreover, the sandwich-type method is ideally suitable for steaming treatment of substrates and flow pots, which means you don’t have to empty and re-fill them.

Which steam boiler is the right one?

The surface performance per cycle depends on the steaming depth, as well as on the size of the boiler and hood.

Steam boilerMS 100MS 200S 250S 350S 500
Surface m²1- 22- 33- 55- 88-10
Steam boilerS 750S 950S 1350S 2000
Surface m²11- 1515- 2020- 3040- 50

Depending on the soil properties and ambient temperature, the steaming time for one working cycle is about 5 minutes for 25cm steaming depth and at about 80°C soil temperature.

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