{"title":"Solar Thermal","description":"\u003ch2\u003eSolar Thermal Pipe \u0026amp; Fittings\u003c\/h2\u003e\n\u003cp\u003ePre-insulated twin stainless steel solar thermal pipe systems, brass compression fittings and installation accessories — everything needed for a professional solar collector to hot water cylinder installation. All products in this range are part of the K-FLEX Twin Solar system, engineered in Italy for fast, reliable solar thermal pipework.\u003c\/p\u003e\n\u003cp\u003eUnlike traditional copper solar pipe, K-FLEX Twin Solar uses flexible corrugated stainless steel tubes pre-insulated with K-FLEX® SOLAR HT high-temperature elastomeric foam and enclosed in a UV-resistant outer sheath. The result is a system that installs faster, performs better over long pipe runs, and withstands the outdoor conditions typical of UK solar thermal installations.\u003c\/p\u003e\n\u003ch3\u003eTwin Solar Pipe\u003c\/h3\u003e\n\u003cp\u003eAvailable in two insulation thicknesses to suit different installation requirements:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/k-flex-twin-solar-system-14mm\"\u003eK-FLEX Twin Solar System – 14mm Insulation\u003c\/a\u003e — suitable for standard domestic installations with shorter, protected pipe runs. Available in DN16, DN20 and DN25, in 10m to 25m coils.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/k-flex-twin-solar-system-20mm\"\u003eK-FLEX Twin Solar System – 20mm Insulation\u003c\/a\u003e — recommended for longer runs, exposed rooftop locations or unheated roof spaces where maximum thermal efficiency is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSolar Thermal Fittings\u003c\/h3\u003e\n\u003cp\u003eThe complete range of \u003ca href=\"\/collections\/solar-thermal-pipe-fittings\"\u003eK-FLEX Twin Solar brass fittings\u003c\/a\u003e for every connection point in the system:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompression Couplings — external and internal thread, DN16 to DN25, tool-free assembly\u003c\/li\u003e\n\u003cli\u003eStraight Fittings — Ø18mm and Ø22mm, DN16 to DN25\u003c\/li\u003e\n\u003cli\u003eDouble Couplings — for joining or extending pipe runs\u003c\/li\u003e\n\u003cli\u003eOlives — replacement compression olives, DN16 to DN25\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/k-flex-twin-solar-copper-connection-sets\"\u003eCopper Connection Sets\u003c\/a\u003e — stainless to copper transition in 15mm and 18\/22mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cp\u003eThe \u003ca href=\"\/products\/k-flex-twin-solar-pipe-accessories\"\u003eK-FLEX Twin Solar Accessories\u003c\/a\u003e range includes flange tools, tube clamps, nipples, nuts, split rings, gaskets and oval pipe supports — everything required for a complete professional installation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat is Twin Solar pipe?\u003c\/h4\u003e\n\u003cp\u003eTwin Solar pipe is a pre-insulated solar thermal pipe system consisting of two corrugated stainless steel tubes enclosed within a single insulated outer sheath. It is designed to connect solar thermal collectors to hot water cylinders, carrying glycol\/water heat transfer fluid between the two. The twin configuration means both flow and return pipes are contained in one flexible assembly, simplifying installation significantly compared to running two separate copper pipes.\u003c\/p\u003e\n\u003ch4\u003eDN16 vs DN20 — which size do I need?\u003c\/h4\u003e\n\u003cp\u003eDN16 is the standard size for most domestic solar thermal installations with one or two collector panels. DN20 is suited to larger domestic systems or commercial installations with higher flow rates and more collector area. DN25 is used in high-capacity commercial systems. If in doubt, check your solar controller or collector manufacturer's flow rate specifications.\u003c\/p\u003e\n\u003ch4\u003eWhat insulation thickness should I choose — 14mm or 20mm?\u003c\/h4\u003e\n\u003cp\u003e14mm insulation is suitable for most standard domestic installations where the pipe run is relatively short and partially protected. 20mm insulation is recommended for longer exposed runs, unheated loft spaces, or where the pipe is routed externally for any significant distance. The thicker insulation reduces standing heat loss and improves overall system efficiency.\u003c\/p\u003e\n\u003ch4\u003eCan corrugated stainless solar pipe be buried or concealed?\u003c\/h4\u003e\n\u003cp\u003eK-FLEX Twin Solar pipe is designed for above-ground solar thermal installations. For buried or concealed applications, consult the K-FLEX technical datasheet and ensure appropriate additional protection is in place. The UV-resistant outer sheath is rated for outdoor and rooftop exposure.\u003c\/p\u003e\n\u003ch4\u003eIs K-FLEX Twin Solar compatible with glycol solar fluid?\u003c\/h4\u003e\n\u003cp\u003eYes. All K-FLEX Twin Solar pipe and fittings are compatible with glycol\/water heat transfer fluid as used in closed-loop solar thermal systems.\u003c\/p\u003e","products":[],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0158\/3481\/collections\/image_ac0ed192-6e8b-4add-b7b9-a608455227ce.png?v=1778244031","url":"https:\/\/www.airconspares.com\/collections\/solar-thermal.oembed","provider":"Airconspares.com","version":"1.0","type":"link"}