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Bedienungsanleitung Steuerung S4_2006_09_25-neu.doc Page 6 / 83
© wodtke GmbH Tübingen. All rights reserved. Subject to change without notice. Month of issue xx/2007 Art. No. 950 281
As a practical guide value, the largest of our Waterplus appliances (10 kW nominal heating
capacity) is capable of generating a maximum 15,000 kWh per year. This is equivalent to 1500
full load operating hours without interruption at a thermal output of 10 kW. Note that when
delivered by an appliance of our “Topline” series, 40% (= 6,000 kWh) of this thermal output
would go towards heating the room of installation, while with an appliance of our series “Smart”
“PE” or “CW 21” the share of heat delivered to the room of installation would be around 20%,
i.e. 3,000 kWh. This must be taken into account in the planning phase by ensuring that
the room of installation is sufficiently large. The following section contains recommendations
for minimum room sizes and suggestions for alternative solutions for smaller rooms of
installation.
2.2 Minimum room sizes
For all wodtke pellet stoves, the room of installation should at minimum have a floor area of 10
and a room volume of 15 m³. With Waterplus appliances one must also take into account
that the room of installation is additionally heated through heat radiation and convection. The
following guide values apply in this case:
Topline Waterplus appliances (60% of thermal output delivered to water*):
room of installation should account for at least 50% of total heated floor area
Smart / PE / CW 21 Waterplus appliances (80% of thermal output delivered to water*):
room of installation should account for at least 30% of total heated floor area
If the room of installation is too small or the hot water demand to high, the room of installation
will become overheated.
Heating surfaces in the room of installation of a Waterplus appliance: If solar energy
plants or buffer storages are used for auxiliary heating, then the room of installation of the
Waterplus appliance must have additional heating surfaces (radiator, floor heating) so that it can
be heated even when operation of the boiler is not required. This can be the case in
interseasonal periods, for example: In autumn the solar plant delivers sufficient energy to
charge up buffer storage completely. The pellet stove boiler can then remain switched off
because the room of installation can be heated via a radiator using energy from the buffer
storage. This would not be possible without a radiator in the room of installation.
Proposed solution when installing Waterplus appliances in small rooms: If you have opted
for a Waterplus device and the designated room of installation does not meet the above
requirements, you can use a clock or room thermostat that
pellet stove boiler
radiator
heating circuit
chimney
Schematic drawing without buffer storage, control and hydraulic
equipment, installations room etc.
*nominal thermal output rating given in accordance with DIN 18891 (draft to DIN 18894)
room or interconnected rooms
of installation)
6


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