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Potterton Commercial's wall-hung natural gas Serious Three boilers are designed for versatility, precision and efficiency. Crafted with precision in stainless steel, these compact and lightweight boilers are well-suited for large domestic and medium-sized commercial applications. These boilers offer single outputs spanning from 50kW to 250kW. Plus, they can be configured for cascade outputs of up to an impressive 700kW, thanks to the integrated cascade option.The boilers boast an outstanding gross seasonal efficiency of up to 97.3%, complete with standard weather compensation. Their remarkable 9:1 modulation ratio minimises frequent on/off cycling, enhancing efficiency and extending the boiler's lifespan. User-friendly features include an easy-to-read display and advanced programming functions, ensuring both simplicity and sophisticated control. These boilers are fully ErP compliant, aiding in reducing carbon emissions and aligning seamlessly with government objectives to enhance overall efficiency and sustainability.Features & Benefits: Potterton Commercial Sirius Three Wall Hung Natural Gas Condensing Boiler - 90Kw, Available with 50kW-150kW output, Impressive modulation ratio of up to 9:1 for improved reliability & longevity, Up to 97.3% gross seasonal efficiency, Lightweight & compact, Integrated cascade function, User friendly, Reduced carbon footprint, Energy-efficient & reliable heat transfer, Up to 700kW cascade output. Potterton Commercial Sirius Three Wall Hung Natural Gas Condensing Boiler - 90Kw 7705088