The Midtherm HTS Twin Wall Flue – 500mm Length is a premium solution for extending single-wall flue systems through ceilings or walls with efficiency and style. Designed for versatility and reliability, this twin wall pipe is available in stainless steel or sleek black finishes, making it an ideal choice for both functional and aesthetic needs. With a finished length of 452mm once installed, it ensures a seamless fit for your high-temperature flue system.
Superior Craftsmanship
Engineered with laser-welded seams and machine-formed joints, the Midtherm HTS flue embodies cutting-edge technology for exceptional durability and precision. Constructed from high-grade materials — 0.5mm 316 2b stainless steel for the inner wall and 0.5mm 304 BA stainless steel for the outer wall — it offers robust performance and a polished appearance. The included locking bands ensure a secure connection, making installation both simple and reliable.
Certified Performance
The Midtherm HTS Twin Wall Flue is designed to handle high-performance demands. It has a 450°C operating temperature and boasts a 4-hour fire rating, providing peace of mind for safe, long-term operation. Manufactured under an ISO 9001-certified quality management system, it comes with CE certification and is produced by a HETAS-registered manufacturer, guaranteeing compliance with stringent safety and performance standards.
Multi-Fuel Compatibility
Versatile and adaptable, this flue is compatible with various fuels, including wood, multi-fuel, gas, oil, biomass, and pellets. Whether you’re outfitting a traditional wood-burning stove or a modern pellet system, the Midtherm HTS flue ensures efficient and reliable operation across a wide range of applications.
Key Features:
- Durable Construction: Stainless steel inner and outer walls for long-lasting performance.
- High Temperature Resistance: Operates efficiently at temperatures up to 450°C.
- Streamlined Installation: Easy-to-use locking bands and consistent joint design.
- Modern Aesthetic: Choose between polished stainless steel or painted black to suit your décor.
- 20-Year Warranty: Backed by a robust warranty for registered and well-maintained installations.
Applications
The Midtherm HTS Twin Wall Flue is suitable for both vertical and angled installations, making it an excellent choice for a variety of configurations. Use it to seamlessly extend single-wall flue systems through walls or ceilings while maintaining consistent performance and safety. Its T450 N1 D Vm L50050 G(50) classification ensures it meets rigorous European standards for insulated chimney systems.
Trusted Quality
Midtherm’s reputation for quality and reliability shines through in every detail of the HTS Twin Wall Flue. With decades of experience and a commitment to innovation, this flue pipe represents the pinnacle of modern flue system design.
Joint Type
Push fit socket and spigot type joint, to be installed with a locking band in place.
Downloads:
- Specification Sheet/ Manual: Midtherm_HTS_manual
- Brochure: QF-34-08-BRO24A
- Warranty: QF-34-08-WARA-23A-1






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