Promat SUPALUX® has a maximum continuous operating temperature of 80^oC, if temperatures locally to the heat-producing appliance regularly exceed this temperature you should use the Promat PROMAFOUR® system. 

All products and components within this product range are rated for continuous operating temperatures of up to 400^oC. Our Promat PROMAFOUR® How to Guide will give you an Introduction.

HETAS Technical Advisory Desk should be able to offer further advice on the subject: https://www.hetas.co.uk/contact/