Buffer volume and hydraulic separation
Adds water volume and hydraulically separates the heat source from the heating circuit.
Buffer Tanks for Heat Pumps and Heating Circuits
Solibuffer Series
The Solibuffer Series adds buffer water volume between a heat pump or boiler and the heating circuit. It helps reduce short cycling, balance circuit flow rates and provide a heat reserve during defrost cycles. Seven nominal sizes are available: 50, 100, 200, 300, 500, 800 and 1000 L.
7 model sizes
95 °C maximum water temperature
6 bar working pressure
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Heat pump compatible buffer
Stable heating circuit
No anode rod required
Highlights
For heating circuits: stable operation and flexible capacity.
Solibuffer adds water volume between the heat pump and the heating circuit, helping balance flow rates and maintain steady heating.
More stable operation
Helps reduce heat pump short cycling and provides a heat reserve during defrost.
Seven model sizes
Across the 50–1000 L nominal range, actual tank volumes are 50, 100, 170, 245, 460, 850 and 1030 L.
Insulation for each model
The 50 L model has 30 mm PU insulation, the 100–500 L models have 50 mm PU, and the 800 and 1000 L models have 80 mm sponge insulation.
Stable water volume for heat pump systems.
Solibuffer adds buffer volume between a heat pump and underfloor heating or other heating circuits. It helps reduce short cycling and supports defrost operation.
Technical data
Solibuffer technical specifications.
| Specification / model | Solibuffer 50 L | Solibuffer 100 L | Solibuffer 200 L | Solibuffer 300 L | Solibuffer 500 L | Solibuffer 800 L | Solibuffer 1000 L |
|---|---|---|---|---|---|---|---|
| Energy efficiency class | C | C | C | C | D | E | E |
| Heat loss (W) | 54 | 62 | 74 | 85 | 140 | 195 | 220 |
| Nominal model size (L) | 50 | 100 | 200 | 300 | 500 | 800 | 1000 |
| Actual tank volume (L) | 50 | 100 | 170 | 245 | 460 | 850 | 1030 |
| Weight (kg) | 20 | 40 | 55 | 73 | 90 | 140 | 160 |
| Dimensions, height × diameter (mm) | 570 × 450 | 750 × 540 | 1200 × 540 | 1750 × 540 | 1625 × 750 | 1850 × 1010 | 2150 × 1010 |
| Max. permissible boiler water temperature (°C) | 95 | 95 | 95 | 95 | 95 | 95 | 95 |
| Max. tank working pressure (bar) | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Insulation material | PU | PU | PU | PU | PU | Sponge | Sponge |
| Insulation thickness (mm) | 30 | 50 | 50 | 50 | 50 | 80 | 80 |
| Outer jacket material | Static painted galvanized sheet | Static painted galvanized sheet | Static painted galvanized sheet | Static painted galvanized sheet | Static painted galvanized sheet | Artificial leather | Artificial leather |
| Heat source inlet / outlet | G 1″ | G 1 1/4″ | G 1 1/4″ | G 1 1/4″ | G 2″ | G 2″ | G 2″ |
| Underfloor heating inlet / outlet | G 1″ | G 1 1/4″ | G 1 1/4″ | G 1 1/4″ | G 2″ | G 2″ | G 2″ |
| Electric heater connection | — | G 1 1/4″ | G 1 1/4″ | G 1 1/4″ | G 2″ | G 2″ | G 2″ |
| Sensor connection | — | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ |
| Drain connection | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ | G 1/2″ |
Technical notes
Model names indicate nominal size; actual tank volumes are listed above. The 50 L model has 30 mm PU insulation, the 100–500 L models 50 mm PU, and the 800 and 1000 L models 80 mm sponge insulation. The 50 L model has no electric heater or sensor connection; an electric heater is optional for the other models. No anode rod is required. G denotes the threaded connection size. Refer to the latest manufacturer manual for installation.
Model names indicate nominal size; actual tank volumes are listed above. The 50 L model has 30 mm PU insulation, the 100–500 L models 50 mm PU, and the 800 and 1000 L models 80 mm sponge insulation. The 50 L model has no electric heater or sensor connection; an electric heater is optional for the other models. No anode rod is required. G denotes the threaded connection size. Refer to the latest manufacturer manual for installation.
Operation
How does Solibuffer work?
Adds water volume and hydraulic separation to the heating circuit.
Operation
How does Solibuffer work?
Installed between the heat pump or boiler and the heating circuit, the tank adds buffer water volume. It helps separate source and distribution flow rates, reduce short cycling and support defrost.
Capacity
Which Solibuffer model should I choose?
Compare the 50, 100, 200, 300, 500, 800 and 1000 L models.
Capacity
Which Solibuffer model should I choose?
Consider heat pump capacity, minimum circuit volume, flow rate and zoning together. The actual volumes of the nominal 50/100/200/300/500/800/1000 L models are 50/100/170/245/460/850/1030 L.
Maintenance
What about the electric heater and maintenance?
Models above 50 L have a heater connection; no anode rod is required.
Maintenance
What about the electric heater and maintenance?
The 50 L model has no heater or sensor connection. Models from 100 to 1000 L have a heater connection; the heater is optional. No anode rod is required. Inspect the system as specified in the manual.
Find the right Solibuffer model for your project.
Contact our team to choose a Solibuffer model that suits your heat pump capacity and heating circuit water volume.
Our sales and engineering teams will review your enquiry.