Solar stainless steel double pipe, bellows BiSolar

Product detailed description

This solar pipe is used in residential and commercial solar thermal systems, particularly for connecting solar collectors to heat exchangers or storage units. The flexible design allows for installation in compact spaces and around obstacles. Installers typically use this product in flat plate or vacuum tube collector arrays where thermal fluid must be transported efficiently with minimal heat loss.

The system operates by transferring heated glycol or water-based medium from the collectors to the storage tank or heat pump. The double-wall construction minimises heat loss and prevents condensation, while the sensor cable provides real-time temperature feedback to the control unit. The product is commonly found in domestic hot water systems and space heating applications.

Technical parameters

EAN	5902023510397
Package dimensions (mm)	750/750/230
Nominal diameter	DN 16
Weight	13 kg
Code	804341
Brand	HEWALEX

The nominal diameter DN16 defines the flow capacity and is crucial for matching the pipe size with the number of collectors and required flow rate. The 13 mm PES insulation thickness ensures thermal efficiency up to 180°C, and the 16 m or 25 m length options allow flexibility in system layout. The maximum pressure rating of 10 bar at 20°C is essential for verifying system safety and compatibility with pump units.

Installation and connection

Installation begins with unrolling the pipe to the required length and ensuring it is free from kinks. Connectors must be compatible with DN16 threads and fitted with sealing rings to prevent leaks. The sensor cable should be routed separately from high-voltage lines to avoid interference.

Compatibility and accessories

This double-walled solar pipe is compatible with solar pump units and control systems that accept DN16 connections. An additional connection kit is required for secure installation. Related products include the connection set for the solar double pipe. Ensure all components are from the same system to maintain performance and safety standards.

Technical background for designers

The operating principle relies on the efficient transfer of thermal energy between the collector and the storage unit. The inner stainless steel tube (AISI 316L) ensures resistance to corrosion and thermal stress, while the outer protective layer prevents mechanical damage. The PES insulation and UV-resistant PVC film extend the service life and reduce energy loss. System efficiency depends on correct sizing based on the number of collectors and the distance between components.

Service and operation

Periodic checks should include inspecting the insulation for damage and verifying the integrity of the sensor cable connections. Any visible wear or leakage should be addressed immediately. Since no specific service interval is provided, maintenance should be carried out according to the system's overall service schedule and local regulations.

Frequently asked questions

Can this pipe be used with glycol-based heat transfer fluids?
Yes, the stainless steel construction is suitable for glycol or water-based media typically used in solar thermal systems.

What is the maximum recommended length per circuit?
For 2 collectors, the maximum total round-trip length is 100 m; for 3 collectors, it is 40 m. Refer to the manufacturer’s guidelines for more details.

Is the sensor cable integrated into the insulation?
Yes, the two-core cable is embedded within the insulation and protected by the outer PVC layer.

Can the pipe be cut to custom lengths on-site?
No, the pipe is supplied in fixed lengths of 16 m or 25 m and cannot be modified after delivery.