The Midtherm TW / SW Adaptor in Black is a purpose-designed component for joining a single-wall flue pipe to the Midtherm HTS Twin Wall system. It provides a smooth, secure transition between systems while maintaining the thermal integrity, safety, and appearance of the installation.
Manufactured from high-grade stainless steel with a durable black finish, the adaptor uses 0.5mm 316 2B stainless steel for the inner wall and 0.5mm 304 BA stainless steel for the outer wall. Laser-welded seams and machine-formed joints ensure precise fitment and long-term reliability. The insulated twin-wall construction supports continuous operation at up to 450°C and carries a 4-hour fire rating.
This adaptor is compatible with a wide range of appliances and fuels, including wood, multifuel, gas, oil, biomass, and pellet systems. It uses a push-fit socket and spigot joint and includes a locking band for a secure, consistent connection.
As part of the Midtherm HTS insulated flue system, it is CE certified, manufactured under ISO 9001 quality controls, and produced by a HETAS-registered manufacturer. When registered and correctly maintained, it is covered by a 20-year warranty.
Features
- Connects single-wall flue pipe to HTS twin-wall system
- Black stainless steel finish for a modern, refined appearance
- Insulated high-temperature design rated to 450°C with 4-hour fire rating
- 0.5mm 316 2B stainless inner and 0.5mm 304 BA stainless outer
- Laser-welded seams and accurately formed joints
- Push-fit socket and spigot joint with locking band
- Suitable for wood, multifuel, gas, oil, biomass, and pellet appliances
- CE certified, HETAS registered, ISO 9001 manufactured
- Backed by a 20-year warranty






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