Serial buffers Buffer
M
Solar flow
Solar return
M
High-temperature circuits return
Start relief
ETA stratified buffer SP
Log wood boiler return
Low-temperature circuits
return
Upper buffer sensor
Middle buffer sensor
Lower buffer sensor
+ lower solar buffer
Upper buffer sensor for hot water
Upper solar buffer sensor
Total output up to
Number of buffer storage tanks
Connection line at least
30 kW
4
DN25
R1“- 28x1,5
140 kW
4
DN50
R2“- 54x1,5
100 kW
2
DN40
R1½“- 42x1,5
80 kW
4
DN40
R1½“- 42x1,5
50 kW
4
DN32
R1¼“- 35x1,5
170 kW
2
DN50
R2“- 54x1,5
To minimise pipe circulation losses it is helpful to incorporate siphon loops downward in the connection lines.
Serial connection and conventional hot water tank or fresh water module
Serially connected buffers with fresh water module and solar stratified charging
Log wood boiler flow
Heating circuits flow
Oil/gas boiler flow
Log wood boiler return
Heating circuits return
Hot water tank return
Oil/gas boiler return
Upper buffer sensor
Middle buffer sensor
Lower buffer sensor
Log wood boiler flow
Heating circuits flow
Oil/gas boiler flow
Cold water
Hot water
Solar flow
Solar return
Oil/gas boiler return
65 kW
2
DN32
R1¼“- 35x1,5
ETA stratified buffer SP ETA stratified buffer SP
ETA stratified buffer SPETA stratified buffer Solar SPS ETA stratified buffer SP
High-temperature circuits return
Cold water
Hot water
Lower boiler sensor solar
Upper buffer sensor for hot water
If there are different buffer types, or if not all buffers can be set up in one group, serial connection of the buffers
is necessary. Note that for serial buffer connection, integration of a solar heating system only works satisfactorily
if a fresh water module is used for the hot water. Solar tanks with internal solar exchangers are only of limited
effectiveness. Combination tanks with suspended hot water tanks or internal water heat exchangers are unsuitable
for a serial buffer connection.
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