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WATER
The heating system must be filled with water which conforms to the
VDI guideline 2035, sheets 1 and 2, “Avoiding damage in hot water
heating systems”.
U
SING A BUFFER TANK When calculating the thermal requirements of buildings, e.g. to
DIN 4701, the lowest outdoor temperature for the climate zone
concerned (e.g. -15 °C) is used. This condition only applies a few days
per year, thus, the thermal performance of the heating system is
greater than required on most days when heating is needed.
For this reason, the HDG Pelletmaster 15/25 is fitted with power
control as standard and with automatic ignition.
It is, however, highly recommended to use a buffer tank even
with automatic boiler systems.
The size of the buffer tank depends on the nominal thermal power of
the boiler and on the thermal requirement of the building. As a
guide, the recommended value of 20 litres per kW boiler output can
be used.
An advantage of using a buffer tank lies in the lower operating hours
of the system and fewer start-up phases due to the extension of the
heating intervals. This leads to a reduction in the proportion of
external energy and to lower wear of the mechanical components.
One further advantage of the buffer tank is in summer operation,
when only hot water is required. When operating in this mode, the
buffer tank avoids frequent ON/OFF changes.
For the above-mentioned reasons, we recommend a buffer tank
even for automatic boiler systems.
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