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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: Potterton Commercial Sirius Three BM Bus Module, Optional control kits for Sirius Three boilers, Suitable for both single boilers & cascades, Helps optimise system performance, energy-efficient, User friendly. Potterton Commercial Sirius Three BM Bus Module 5140908