Apricus Solar Evacuated Tubes

Heat Your Hot Water From The Sun

Irelands Best Priced Premium Brand Solar Evacuated Tube System


Great Reliability, Great Quality and Great Prices

Apricus Solar Evacuated Tubes

The Apricus Vacuum Tube Solar Collector is a highly efficient solar hot water heater, particularly suitable for northern climates such as the UK and Ireland. The curved absorber inside each vacuum tube means that the Apricus system collects energy from early morning until evening, maximising the potential of this collector in our climate conditions. This is known as the incident angle modifier (IAM) and makes the Apricus collector one of the most efficient products available.


The ETC solar collector is comprised of four main parts:

Evacuated Tube (ET)

Absorbs solar energy and converts it to usable heat. A vacuum between the two glass layers insulates against heat loss.

The Heat Transfer Fin helps to transfer heat to the Heat Pipe.

Heat Pipe (HP)

Copper vacuum pipe that transfers the heat from within the ET up to the manifold.


Insulated box containing the copper header pipe. The header is a pair of contoured copper pipes with dry connect sockets that the heat pipes plug into.

Mounting Frame

Strong and easy to install with a range of attachment options.

Solar Evacuated Tube
Solar Evacuated Tube

Collector Operation

Step 1:  The Apricus evacuated tube solar collector converts sunlight into heat.  A circulation pump moves liquid through the collector, carrying heat back to the solar storage tank.

Step 2: Gradually throughout the day the water in the solar storage tank is heated up.

Step 3: When hot water is used, and the cylinder cools. The Solar Collector transfers heat once again to the hot water storage tank.

Design Advantages


Evacuated Tube and Heat Pipe

The Apricus evacuated tube and heat pipe are assembled in a patented format that is different to any other product on the market. Rather than a centrally located heat pipe with heat transfer fins radiating out to the glass wall, the heat pipe is positioned directly against the glass wall, where the sun strikes. The aluminium heat transfer fin is tightly held against the top inner wall of the evacuated tube and heat pipe with a set of spring clips.  This is an important design feature as over time, with exposure to high temperature, the Aluminium will soften.  The spring clips gaurantee long term tight contact with the glass wall and heat pipe, which is essential for optimal performance.

Solar Evacuated Tube

Passive Tracking

The round absorber surface of the evacuated tubes passively track the sun throughout the day, so no mechanical tracking device is required. This allows optimum surface area exposure from 7am to 5pm which covers the majority of the solar radiation each day.  The Apricus evacuated tubes receive >20% more solar exposure compared to a flat absorber, allowing more solar energy conversion to heat each day.

Solar Evacuated Tube

Header Design

The header pipe in the AP series evacuated tube solar collectors is designed for reliability. Large fluctuations in operating temperatures from day to night cause thermal expansion and contraction of the metal, which, combined with high operating pressures, places a huge amount of stress on brazed connection points.

In contrast to most other header designs that have 2 brazing points per heat pipe (60 for 30 tube collector), the Apricus design uses a twin contoured header pipe design that allows “dry” connection ports that don’t penetrate the header pipe. This means the header only has 4 brazing points in total. The result is an extremely reliable design that is able to withstand the rigors of daily thermal cycling.

Solar Evacuated Tube

Manifold Casing

The manifold casing is made of a strong but lightweight aluminium alloy that is folded to form a strong protective enclosure. The casing is finished with matte black PVDF coating that is UV stabilised for long term colour fastness.

Glass wool insulation is “baked like a cake” to form a complete structural shell around the header pipe. This design minimises the amount of metal used in the casing, reducing embodied CO2, and making it very lightweight. The lightness of the manifold box is a feature that installers value when carrying onto the roof. The largest manifold size, the ETC-30, is 2196 mm / 86.45″ long but only 9.2kg / 20.24 lbs.

Solar Evacuated Tube