NOVA Pumped Expansion and Pressurization Unit
Packaged System Solutions
Tanpera NOVA Pumped Expansion / Pressurization Unit is a technological device developed to absorb expansion in heating and cooling systems and keep plant pressure constant.
About the NOVA Pumped Expansion and Pressurization Unit
Tanpera NOVA Pumped Expansion / Pressurization Unit is a technological device developed to absorb expansion in heating and cooling systems and keep plant pressure constant.
The expansion system uses a pump to return the shortfall of plant water that contracts when water cools, thereby preventing a drop in plant pressure. The system keeps the set pressure constant in heating and cooling installations.
Operating Principle
Stored water in the expansion tank is returned to the plant when the pump starts; the plant is brought to the desired pressure and held constant.
With the integrated data-flow automation system and flow meter on the Pumped Expansion / Pressurization Unit, the lost water quantity is measured and automatic make-up from the mains line is provided.
Advantages
Space Savings
Because the Tanpera Pumped Expansion System has on average five times higher expansion capability than classic diaphragm expansion vessels, it occupies a much smaller footprint and saves space.
Controlled Operation
Keeping pressure constant significantly reduces fresh-air ingress into the plant and increases corrosion resistance.
Automation Capabilities
An LCD display and fault notification make it easy to identify the cause of a fault and intervene.
Low Maintenance Cost
The outer surface of the membrane inside the tank is open to atmosphere and unpressurized. Maintenance and operating costs are lower; membrane life is longer and periodic pressure-resistance inspection is not mandatory.
Energy Savings
Reduced air ingress and lower oxygen in the air protect plant equipment (pipes, fittings, valves, heating appliances, and pumps) from corrosion; maintenance and replacement needs decrease significantly and system life is extended.
Control Unit
The control unit on the Nova Pumped Expansion / Pressurization Unit commands and controls all functions. An advanced electronic control system provides system status, management, and monitoring.
It has IP54 protection class and is resistant to wetting and vibration.
Automation
- MODBUS RS-485compatibility allows 6 different types of information signal to be sent to the building automation center.
- With software based onMQTTinfrastructure, when internet is available via WiFi or Ethernet it communicates with the building automation center and offers monitoring and control.
- Internet-connected devices are monitored24/7by the Tanpera Service Management center; in the event of a fault, the user is informed and immediate intervention is possible.
- Connection and control via amobile applicationare available on all Android devices.
Expansion Tank (TPG)
The exterior is painted with industrial paint for ambient durability; the interior is painted with anti-corrosion paint to increase corrosion resistance. Plant water is inside the membrane; the outside of the membrane is open to atmosphere and unpressurized. Free air inlet/outlet is provided via an inverted U-pipe mounted on the tank's upper dome.
If the product will be used in a cooling system, this must be stated at the design stage; insulation suitable for cooling systems must be applied to prevent condensation. Flexible connection sets manufactured from stainless steel between the expansion tank and control unit are included as standard.
Pressure Balancing Tank
A dynamic pressure balancing tank is used to absorb pressure differences caused by sudden load changes or by the pressurization pump starting and stopping, and to minimize pressure difference at the otherwise nearly constant plant pressure. The dynamic pressure balancing tank (50, 100, or 200 liters), offered according to system water quantity and operating pressure, is included in the standard delivery scope.
Key Features
- Highly controlled operation with ±0.1 bar pressure precision.
- 95% effective expansion volume — approximately 5× more compact than diaphragm vessels.
- IP54 protection class, 4.3" touch LCD screen, and 4 operating modes.
- Building-automation integration via MODBUS RS-485 and MQTT; 24/7 remote monitoring and mobile app support.
- Single- or dual-pump alternatives; equal aging and redundancy capability.
- Automatic mains water make-up with integrated flow meter.
- Instant tank fill-level measurement with weight sensor.
- Automatic air separation via air-venting mode; no air/nitrogen top-up required.
- Expansion tank capacity options from 500–5000 liters.
- Sizing criteria compliant with EN 12828 / VDI 4708 standards.
Installation
Pressure sensor, expansion tank, and pressurization-line connection points must be located according to the project schematic. Electrical supply is 380V; MODBUS and MQTT connections should be integrated into the building-automation infrastructure. Minimum 500 mm clearance requirements should be observed.
During commissioning, pressure testing, flow adjustment, temperature control, and automation communication tests must be performed. The Tanpera technical team provides on-site support and training.
After-Sales Services
Tanpera Service Management center; in the event of a fault, the user is informed and immediate intervention is provided.
Frequently Asked Questions
The Tanpera NOVA Pumped Expansion / Pressurization Unit is a technological device developed to absorb expansion in heating and cooling systems and keep plant pressure constant. Expanding water during heating is transferred to the tank via a motorized valve; during cooling the pump returns stored water to the plant. Lost water is automatically made up from the mains via the integrated flow meter, and plant pressure is held constant to ±0.1 bar precision.
Effective expansion volume reaches 95% on TPG systems versus only ~20% on diaphragm vessels; a tank of approximately 1/5 the volume is sufficient for the same capacity. Because there is no high-pressure gas outside the membrane, air/nitrogen top-up is not required, air diffusion is very low, and periodic pressure-resistance inspection (TS 1203 EN 286-1) is not mandatory. Pressure can be set from the panel to ±0.1 bar precision; automatic air-venting mode separates air from the plant.
It is preferred in central heating-cooling systems such as shopping malls, dormitories, hospitals, factories and industrial facilities, tourism and hospitality facilities, lifestyle centers, social facilities, and estates and apartments. It especially provides a stable pressure profile in high-rise buildings, large-capacity HVAC plants, and projects with rapid load changes.
It comprises the expansion tank, air-discharge purger, solenoid valve, command and control panel, control unit, pump, flow meter, mains connection port, plant supply/return connection ports, and dynamic pressure balancing tank (50/100/200 L). The control unit is IP54 and houses the solenoid valve, safety valve, check valve, isolation valves, sensors, and 4.3" LCD screen on one platform.
By improving heat transfer it allows pumps to operate at lower head. Holding pressure constant to ±0.1 bar reduces fresh-air ingress; pipes, valves, heating appliances, and pumps are protected from corrosion. Frequent safety relief and short-cycling are prevented, lowering energy consumption and extending equipment life.
During commissioning, pressure setpoints, pump control parameters, the 4 operating modes (Manual, Automatic, Stop, Air Venting), and alarm limits are set from the LCD panel according to the project design. Air/nitrogen top-up and periodic pressure-resistance inspection are not required on TPG systems; maintenance costs are low. Internet-connected devices are monitored 24/7 by the Tanpera Service Management center; Tanpera technical service provides support.
You can download the English brochure and user manual as PDFs from the Documents tab on the product page. Up-to-date technical documents are published regularly in this section.
Submit your project details via the Quote Form on the product page, or contact our sales team at sales@tanpera.com. Our engineering team will contact you for sizing and pricing to EN 12828 / VDI 4708 criteria based on your project data.
