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The DHW zone is heated by the condensing
boiler (pos. A) via the heat exchanger for
cylinder heating (CH-HE pos. 19), through
which water flows from the top to the bottom.
With the GSU, the SL HW ends approx. 40 cm
above the cylinder floor. Only the DHW zone
above will be heated by the boiler. The
cylinder volume below that point will only be
heated in solar applications.
With the GCU, the SL HW is drawn right down
to the cylinder floor. That ensures that the
entire cylinder volume is heated by the boiler,
ensuring a higher DHW standby volume.
This design offers the particular benefits for
the DHW side offered by the
GasSolarUnit/GasCompactUnit.
Optimum water hygiene
Zones that experience little flow or heat
exposure on the DHW side are completely
excluded by the GasSolarUnit/GasCompact-
Unit. Deposits of sludge, rust or other
sediments that can occur in large volume
cylinder, are not possible with this design.
Water fed into the cylinder first will also be
used first (first-in/first-out principle).
Low on corrosion and maintenance
The cylinder is made from plastic, making it
totally free from corrosion. The DHW and the
central heating water heat exchangers are
made from high-grade stainless steel (1.4404).
Sacrificial anodes or similar corrosion
protection measures are not required.
Maintenance work, such as the replacement of
protective anodes or cleaning of the cylinder or
anything else in its place are required.
During the annual boiler inspection, check the
level of water and top up, if required (see
chapter 6.1).
Economical to operate
The all-round thermal insulation of the cylinder
ensures low heat losses during operation and
therefore a frugal handling of the applied
heating energy.
Stratification inside the cylinder
The spiral shape of the heat exchanger and
the direction of flow in the countercurrent
principle create a distinct temperature
stratification inside the cylinder every time
heat is drawn off or when the cylinder is
heated up. A high DHW flow rate can be
achieved, even is large volumes of DHW are
drawn off, as high temperatures can prevail in
the upper cylinder area for long periods of
time.
With the GSU, the solar zone in the lower area
will cool down and will not be reheated by the
gas fired condensing boiler. This improves the
efficiency of and the yield from the solar
heating system.
Please note: In a few areas,
aggressive potable water is
supplied by water supply
companies. This water could lead to
corrosion damage, even on high-grade
stainless steel. Please check with your
water supply company whether corrosion
problems can occur in their supply area
when using stainless steel DHW cylinders.
For areas with highly corrosive water, we
offer the Sanicube PEX that has proven to
be highly successful over many years (see
ROTEX pricelist or the Sanicube
brochure). This may be used in
combination with a ROTEX A1 oil or gas
fired condensing boiler as an ideal
solution for energy and space-saving
DHW and central heating with optional
solar connection.
Low susceptibility to scaling
On the cylinder water side, the scale from the
initial water fill is the only scale that may
occur. Scale, that progressively reduces the
heat transfer performance of other cylinder
designs, cannot build up on the smooth
stainless steel corrugated pipe heat
exchanger.
Any attached scale will be released through
thermal and pressure expansion and the high
flow rate inside the DHW heat exchanger.
Consequently, scale will not build up either in
the DHW or in the central heating heat
exchangers.
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