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ETA has developed a unique stratified charging concept, at the heart of which is the buffer charging management. It knows precisely when and to what capacity the tank can ideally be charged and when heat will be provided to the consumer again. The entire buffer management can be regulated and controlled via the boiler touchscreen or via the meinETA internet platform.Heat rises and cold drops:
That's a law of physics that also applies to the water in the buffer. If you were to always introduce water at the same point in the buffer regardless of the temperature, this would cause a lot of intermixing in the buffer. That in turn would lead to energy losses. Instead, the water from the heating return, for example, or from the solar heating system is sent precisely to where it belongs in the buffer - the colder water further down, the hotter water further up.
The better the temperature stratification works, the better and more conservatively the buffer works energy-wise. That's why it's important to move the water slowly. The water infeed ends up in the right stratification of the buffer via special ETA shims.
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Technology
Layer by layer
the right temperature
The sensor pipes are attached in a way so that the control system can work optimally. An immersion sleeve does not have to be screwed on separately, it is already integrated. Thus, sensors can be shifted, if required, without having to drain the water.
Depending on the desired temperature, the heating water for the hot water supply
is always taken from the correct point.
At 70 to 80 °C the flow is fed from the boiler. 
With water between 45 and 65 °C the radiators are fed. 
Between 45 and 100 °C hot water is fed from the solar heating system
if the sun shines brightlyBetween 35 and 50 °C return from the hot water tank. 
Between 35 and 45 °C return from the radiators. Between 30 and 45 °C water from the solar heating system,
if the sun only shines a bit.
Between 30 and 35 °C hot water will be fed to the underfloor heating. Between 25 and 35 °C return to the radiators. 
Between 25 and 35 °C return from the fresh water module. Between 22 and 70 °C return to the solar heating system. Between 22 °C and 27 °C return from the underfloor heating. -
Technical data
Technical data
SP stratified buffer and SPS 600 to 2200
The number and position of the connections is optimised for the ETA hydraulics and control system. The following figures depict a Solar SPS
stratified buffer with a supplemental solar exchanger (connections S1 and S2). The M3 connection without thermosiphonic separator is intended for the return connection of boilers that are to heat only the upper half of the buffer, or for the attachment of an electric heating element with a 6/4" outside thread.
The M4 connection is designed specifically for the return from the hot water tank. By means of the thermosiphonic separator, a warm return flows to the middle of the buffer and a cold return to the lower third.
The M6 and M7 connections are only installed on stratified buffers SP and SPS 2200. These connections are equipped with an inflow lance for high outputs with a flow rate of up to 20 m³/h.
If more than two buffers are used for hydraulic reasons, they must be connected using external piping in a Tichelmann system.
For the solar stratified buffer, a minimum collector area of 1 m² is required for each 100 litres. For smaller collector areas on larger buffers and very large solar heating systems, we recommend the ETA stratified charging module.Technical data Unit SP 600
SPS 600SP 825
SPS 825SP 1000
SPS 1000SP 1100
SPS 1100SP 1650
SPS 1650SP 2200
SPS 2200Volume l 600 825 1,000 1,100 1,650 2,200 Heat retention loss S*
W 112,50
120,83
125,00
133,33
162,50
- Tank classification*
C C C C C - Maximum permissible operating pressure bar 3 Maximum permissible operating temperature °C 95 Total weight (without solar exchanger) kg 117 141 160 166 274 328 Colour selection of the insulation Silver Silver / melon yellow Melon yellow I Insulation mm 100 d Diameter (without insulation) mm 700 790 790
850 1,000 1,150 D Diameter (with insulation) mm 900 990 990 1,050 1,200 1,350 H Height (with insulation) mm 1,800 1,939 2,219 2,150 2,370 2,380 K Tilted height (without insulation) mm 1,810 1,970 2,240 2,200 2,420 2,430 Position height Unit SP 600
SPS 600SP 825
SPS 825SP 1000
SPS 1000SP 1100
SPS 1100SP 1650
SPS 1650SP 2200
SPS 2200M0
Coupling 6/4"top M1
mm 1,595 1,718 1,998 1,910 2,095 2,080 M2
mm 1,240 1,393 1,513 1,535 1,710 1,735 M3
Coupling 6/4" (without shim) mm 865 833 943 940 1,020 1,100 M4 Coupling 6/4" mm 800 773 883 875
940 965 M5 mm 125 148 148 170 205 230 M6 2" coupling mm - - - - - 360 M7 mm - - - - - 1,970 T1 Immersion sleeve 9 mm diameter
(for temperature sensor)mm 1,510 1,628 1,908 1,820 2,005 1,985 T2 mm 1,340 1,493 1,613 1,635 1,810 1,835 T3 mm 1,140 1,293 1,413 1,435 1,610 1,635 T4 mm 965 933 1,043 1,040 1,120 1,200 T5 mm 525 503 547 565 625 690 T6 mm 230 253 253 275 310 325 Supplemental data for Solar SPS stratified buffer:
Technical data Unit SPS 600 SPS 825 SPS 1000 SPS 1100 SPS 1650 SPS 2200 Optimum solar collector area
(in relation to tank volume)
m² 3-7 4-9 5-11 6-12 8-18 11-25 Maximum solar collector area
(as regards solar exchanger)
m² 15 15 18 20 25 30 Maximum permissible operating pressure (solar exchanger) bar 16 Maximum permissible operating temperature (solar exchanger) °C 110 Total weight (with solar exchanger) kg 157 182 206 213 338 409 Heating area of solar exchanger m² 2.5 2.5 2.9
3.2 4.0 5.1 Volume of solar exchanger l 15.5 15.5 18.0 20.0 25.0 33.9 Pressure loss at 1000 l/h mWs 0.31 0.31 0.36 0.39 0.49 0.61 Position height Unit SPS 600 SPS 825 SPS 1000 SPS 1100 SPS 1650 SPS 2200 S1 R1“ coupling
(solar heat exchanger connection)mm 818 757 841 863 940 1.032 S2 mm 230 253 253 275 310 360 *The tank classification values specified by us for ETA SP/SPS and the heat retention losses apply only to the following combination:
ETA SP/SPS stratified buffer storage and insulation for ETA SP/SPS NeodulPlus
Just for the calculation of the energy labelling of packages - NOT VALID AS ENERGY EFFICIENCY FOR HOT WATER STORAGE TANKSSP 3000 to 5000 stratified buffer
The number and position of the connections is optimised for the ETA hydraulics and control system. The following figures show an SP stratified buffer.
The M1 and M5 connections have a special inflow/outflow cylinder and are therefore designed for large boiler outputs up to 500 kW (25 m³/h).
The M3 connection without thermosiphonic separator is intended for the return connection of boilers that are to heat only the upper half of the buffer, or for the attachment of an electric heating element with a 6/4" outside thread.
The SP 3000–5000 tank range is only available without solar exchanger. For large volumes, a solar heating system is connected via external heat exchangers such as the ETA solar stratification module, for example.
The M4 connection is designed specifically for the return from hot water tanks.
If more than two buffers are used for hydraulic reasons, they must be connected using external piping in a Tichelmann system.
Technical data Unit SP 3000 SP 4000 SP 5000 Volume l 3,000 4,000 5,000 Maximum permissible operating pressure bar 3 Maximum permissible operating temperature °C 95 Total weight (without solar exchanger) kg 397 477 582 Colour selection of the insulation Melon yellow I Insulation mm 100 d Diameter (without insulation) mm 1,250 1,400 1,600
D Diameter (with insulation) mm 1,450 1,600 1,800 H Height (with insulation) mm 2,712 2,920 2,850 K Tilted height (without insulation) mm 2,740 2,950 2,890 Position height Unit SP 3000 SP 4000 SP 5000 M0 Coupling 6/4" mm top M1 2" coupling mm 2,286 2,465 2,355 M2 Coupling 6/4" mm 1,811 1,915 1,880 M3 Coupling 6/4" (without shim) mm 1,176 1,300 1,245 M4 Coupling 6/4" mm 1,041 1,145 1,110 M5 2" coupling mm 426 455 495 T1 9 mm immersion sleeve
(for temperature sensor)
mm 2,386 2,565 2,455 T2 mm 1,911 2,015 1,980 T3 mm 1,711 1,815 1,780 T4 mm 1,276 1,400 1,345 T5 mm 766 835 835 T6 mm 326 355 395
