
KSG 21 Premium GT
Flat-plate copper solar collector
Key Features
- Top optical efficiency 82.9%.
- Energy cost savings – up to 60% per year*.
- European quality guaranteed – Solar Keymark certified.
- All-copper absorber with 12-tube harp.
- Prismatic anti-reflective glass – 96% transmittance.
- Safety – glass resistant to hail.
- Easy installation, only 2 connection ports, intuitive control.
- 10-year solar collector efficiency warranty.
Product Description
Detailed information about the product features and specifications
The highest efficiency in Europe
Efficiency at the level of 82.9% is the highest optical efficiency of collectors in Europe**. The unique quality and efficiency of KSG 21 Premium GT solar collectors is confirmed by the Solar Keymark certificate awarded only to the best products. Solar Keymark is a quality certificate for solar products confirming compliance with European standards and including annual inspections of production lines.
KSG Premium collectors by Galmet are the foundation of ecological domestic hot water heating systems for residential buildings, industrial facilities, hotels, schools and public buildings.
Premium means copper
The high efficiency of KSG Premium collectors is ensured by the use of an all‑copper absorber with a highly selective coating, ultrasonically welded to a double harp. The use of a harp consisting of as many as 12 copper tubes ensures maximum utilization of the collector’s potential. To provide optimal bottom insulation of the collector, top‑quality solar mineral wool has been applied.
Premium means high parameters
Tempered, anti‑reflective prismatic glass guarantees transmission of 96% of the sun’s rays incident on the collector. It provides test‑proven hail resistance.*
Premium means advanced technology
KSG solar collectors are the result of cooperation between Galmet engineers and scientists from the Wrocław University of Science and Technology. These efforts led to the creation of one of the most advanced production lines in Europe. A bent aluminium profile— a product with exceptionally high parameters—has been patented. The double‑walled aluminium frame is made from a single element which, in addition to enhanced insulation, also provides greater rigidity of the entire collector.
Premium means easy installation
The advanced construction of the collectors has enabled the use of a simplified installation method. The flat‑plate collector is connected to the system with two connection ports, and to the next collector with just one port.
KSG Premium GT solar collectors are offered with mounting kits: directly on a pitched roof or on a rack, and on a flat roof.
Premium means comprehensive
For each KSG Premium collector, Galmet offers complete additional equipment, which includes:
- Pump group containing efficient electronic circulation pumps.
- Expansion vessel with a capacity from 18 to 50 litres.
- STDC control module; MTDC controller or Smart GT Sol with colour display available at extra charge.
- Collector‑to‑system connection kit.
- Glycol dedicated to copper collectors – 20 litres.
and components of the solar set, including:
- Bivalent heat exchangers with capacities from 200 to 500 litres.
- Heat exchangers with heat pump.
Premium means economy and warranty
Using Galmet solar collectors for domestic hot water heating saves up to 60% of energy costs. High‑quality materials and proven production technology have made it possible to provide a 10‑year warranty on collector efficiency.
Individual selection
For each investment, collectors are selected individually according to the investor’s needs. Direct contact:
Sebastian Mamczur
tel. +48 77 403 45 55
s.mamczur@galmet.com.pl
* compared to an electric water heater
** optical efficiency in the double harp configuration


