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Underfloor heating
Underfloor heating systems are slow low temperature
heating systems and respond only very slowly to short
term temperature changes.
Heating with reduced room temperature at night there-
fore does not result in any significant energy savings.
Heating circuit
A heating circuit is a sealed unvented circuit that con-
nects the boiler and radiators, in which the heating
water circulates.
A system may comprise several heating circuits.
For example, one heating circuit for the rooms occu-
pied by you and one heating circuit for the rooms of a
separate apartment.
Heating circuit pump
Circulation pump for circulating the heating water in
the heating circuit
Micro CHP unit
Combined heat and power system with low electric
output (< 5 kW) to meet the basic demand for electrical
energy and heat. For use in detached and two-family
houses.
Reclaiming fuel tax [Germany]
In Germany, it is possible to reclaim the energy tax for
gas used to operate the fuel cell module. This is done
by submitting a request for an energy tax refund to the
customs office. The previously paid energy tax will
then be refunded in part.
Mixer
Hot heating water from the heat generator is mixed
with cooled heating water from the heating circuit. The
heating water, thus brought to the required tempera-
ture, is pumped to the heating circuit by the heating cir-
cuit pump. The control unit adjusts the flow tempera-
ture via the mixer to suit different conditions, e.g.
changing outside temperatures.
Mains monitor (ENS)
Mains monitoring facility with associated switching
devices. This is used to disconnect generating sys-
tems from the grid in case of a power cut or mains
fault.
This both protects the system and prevents undesired
export to the grid (e.g. to protect individuals and prop-
erty when a fuse/MCB responds).
Open flue operation
The combustion air is drawn from the room where the
heat generator is installed. Open flue operation is not
permissible with Vitovalor PA2.
Appendix
Terminology
(cont.)
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Summary of Contents for Vitovalor PA2
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