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These control options from Potterton include options and components suitable for the Commercial Sirius Three model. Designed to provide you with better control over your Sirius Three boilers, optimise their overall performance and improve their energy efficiency, they include wired remote control options, multi-function extension module, BM bus module and strap-on flow temperature flow sensor options and more.Features & Benefits: Commercial Sirius Three Control Options Sirius Three QAD 36 Strap-On Flow Temperature Sensor, Optional control kits for Sirius Three boilers, Suitable for both single boilers & cascades, Helps optimise system performance, energy-efficient, User friendly. Commercial Sirius Three Control Options Sirius Three QAD 36 Strap-On Flow Temperature Sensor Potterton Commercial 5140910