The Midtherm HTS Twin Wall 15° Angle in black is engineered for long-term performance in medium to high-temperature chimney systems, delivering exceptional durability and reliability for solid fuel, multi-fuel, gas, oil, and biomass installations. Its precision-built 316L stainless steel inner liner, robust 304 stainless steel outer casing, and high-density mineral wool insulation ensure optimal safety, heat retention, and longevity. Designed and manufactured in Britain by Midtherm Flue Systems, it offers a dependable, future-proof solution backed by decades of expertise and rigorous industry certifications.
A clean, modern aesthetic and flexible installation options make this 15° angle suitable for domestic and commercial projects requiring both function and visual appeal. With a powder-coated black finish, a secure push-fit system, and a refined locking band, the component installs quickly and delivers a professional finish every time. Its ability to withstand operating temperatures up to 450°C makes it ideal for demanding environments and a wide variety of appliance types.
Available in multiple diameters and supported by a comprehensive 20-year warranty (when installed and maintained correctly), the HTS Twin Wall system provides proven safety, compliance, and long-term value. Certified to leading CE and British Standards, it ensures dependable performance and installation confidence for heating and ventilation professionals requiring a high-grade insulated chimney solution.
Features and Benefits
- 0.5mm 316L stainless steel inner liner for superior durability
- 0.5mm 304 stainless steel outer casing for long-lasting protection
- 25mm high-density mineral wool insulation for heat retention and safety
- Operating temperature resistance up to 450°C for demanding systems
- Modern bright annealed or powder-coated black finish
- Push-fit connection for fast, secure assembly
- Over-center locking band for smooth, reliable joints
- Diameters from 100–300mm for versatile installation
- Suitable for solid fuel, gas, oil, biomass, and ventilation systems
- Supported by a 20-year warranty for peace of mind
- Fully certified to CE, BS 476, BS EN 1856-1, and BS EN 1443 standards






Reviews
There are no reviews yet.