FAQ

e-stoves for residential properties

The e-stove uses logs to produce electricity, heat and hot water for living areas via the wood gasification technique, and via thermoelectric means in the form of maintenance-free and noiseless thermoelectric generators (TEG).

Wood gasification:
The exhaust gases from the combustion chamber are not directly fed to the stack (as in conventional furnaces), but are instead diverted into a second combustion chamber for post-combustion. Thus energy utilization from the wood is increased to > 92%.

Electricity generation:
Using maintenance-free and noise-free thermoelectric generators in the furnace.

Technical data:

  • 15-25 kW for heating and hot water using wood gasification technology
  • 250 watts (peak) power output
  • 60-litre capacity, for logs of 33-40 cm
  • up to 4 hours' burn time with one load of wood
  • with natural draft or blower operation
  • also available as a boiler for boiler rooms
  • best used in combination with photovoltaic systems
  • Security of supply – works in the event of a mains power failure when conventional heating fails
  • available with various covering designs
  • Made in Germany
    Together with PV and solar-thermal technologies:
    Perfect if self-sufficiency based on fuel oil or gas is desired. The electricity produced by the photovoltaic equipment and e-stove is stored in the battery; the thermal heat generated is stored in the buffer memory – thus a 2- to 3-day period of low energy can be bridged.

    Universally applicable:
    The e-stove can be combined with any other heating technologies.

 

Self-sufficiency through power generation

How much power should be generated in order to be energy self-sufficient?

A family of four in a conventional single-family house consumes an average of 4,200 kWh per year.
11.5 kWh per day and 0.48 kWh per hour is expected to be generated.
(Source: Stromspiegel 2016, Federal Ministry for the Environment)

We recommend:
To be self-sufficient, it would make sense to use a mix of electricity generators that can cover twice the daily requirement. In addition, there should be storage available capable of holding at least three times the daily requirement.

Advantage – heating with wood
Wood is considered by many to be a productive fuel, under the motto "properly utilising heat".
2.5 kg wood can replace 1 litre of fuel oil or 1m3 of gas.
Via a wood gasifier, approximately 5.2 m3 of beech wood can replace 1000 litres of heating oil or 1000 m3 of gas.

 

Average heating requirement
A family of four consumes about 22,000 kWh in an older home (estimated at about 200 heating days).
The requirement therefore is 110 kWh per day's heating. The e-stove generates this power within 6 hours.

Average power demand
This family consumes an annual average of 4200 kWh – 11.5 kWh per day, i.e. 0.48 kWh per hour.
The e-stove can provide this hourly requirement when in operation.

Astronautics and thermoelectrics

Thermoelectric materials are materials which generate electricity due to a temperature difference. Thomas Johann Seebeck discovered the effect in 1822 (Seebeck effect). The first technical applications using thermoelectric generators following in the mid-20th century in space probes researching regions in space distant from the sun. The generators require no moving parts, unlike many other conversion mechanisms, and therefore operate in a noiseless and maintenance-free manner, and are extremely reliable.

Thermoelectric materials © HE Energy GmbH


Further questions

Do you have further questions on the technology around wood gasifiers, our e-stove or comprehensive system solutions?
Then please don't hesitate to contact us. Contact