The Midtherm HTS Twin Wall 45° Angle is a premium insulated chimney component designed for medium to high-temperature applications. Precision-engineered and backed by decades of expertise, it is the ideal solution for installations using solid fuel, multi-fuel, gas, oil, or biomass. Manufactured by Midtherm Flue Systems—the only British-owned manufacturer in the industry—this product combines durability, functionality, and a sleek, modern design.
Features
Exceptional Build Quality
- Inner Liner: Made from 0.5mm 316L 2B grade stainless steel with a welded seam, it is 25% thicker than most systems, ensuring superior durability.
- Outer Casing: Constructed from 0.5mm 304 BA grade stainless steel, also with a welded seam, offering robust protection.
- Insulation: Features 25mm of high-density mineral wool for excellent heat retention and enhanced safety.
Temperature Resistance
Capable of withstanding operating temperatures up to 450°C, making it suitable for demanding heating and ventilation systems.
Innovative Design & Compatibility
- Modern Aesthetic: Available in a bright annealed stainless steel finish or powder-coated black to suit various installations.
- Push-Fit System: Features a socket and spigot connection for quick, secure assembly.
- Locking Band: Equipped with an over-center stainless steel clip, ensuring a smooth, secure, and visually appealing joint.
Versatile Dimensions
Stocked in diameters of 130mm, 150mm, with options available from 100mm to 300mm (larger sizes available on request).
Applications
Suitable for a variety of domestic and commercial installations, including:
- Solid Fuel
- Oil and Gas
- Biomass and Pellets
- Ventilation and Extract Systems
Comprehensive Warranty
Enjoy peace of mind with a 20-year warranty for registered installations when installed and maintained correctly.
Certifications & Assurance
HTS Twin Wall components meet Class 1 Twin Wall standards, ensuring safety, efficiency, and compliance with modern heating requirements. Installation and use must adhere to proper sizing and design specifications to maintain warranty coverage.
Why Choose Midtherm HTS?
- Trusted Reliability: Manufactured by a family-run, environmentally conscious business with a nationwide distribution network.
- Unmatched Quality: Built using advanced manufacturing and welding techniques for superior performance.
- Adaptable Design: Compatible with a wide range of appliances and fuels for versatile applications.
- Custom Finishes: Powder coating available in any BS or RAL color to complement your aesthetic preferences.
Downloads:
- Specification Sheet/ Manual: Midtherm_HTS_manual
- Brochure: QF-34-08-BRO24A
- Warranty: QF-34-08-WARA-23A-1
Specifications
HT-S Technical Specification:
| Type | Details |
| Product Code: | 08 |
| Description: | 316 / 25mm Rockwool / 304 |
| Inner Skin: | 0.5mm 316 (EN 1.4404) |
| Outer Skin: | 0.5mm 304 (EN 1.4301) |
| Insulation: | Mineral Wool 128kg/m3 |
| Insulation Thickness: | 25mm |
Product Certification:
| Certificate Name | Number | Issued By | |
| CE Mark | 0086-CPD-566560 | BSI | |
| BS 476 | WARRES – 128942 | Faverdale | |
| BS EN 1856-1:2003 | 54522/1 | BSRIA | |
| BS EN 1443:2003 | 55693/1 | BSRIA |
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