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The Potterton Commercial Sirius Three wall-hung natural gas condensing boilers are compact, lightweight, and easy to install. They offer versatile, precise, and energy-efficient heating solutions for large domestic and medium-sized commercial applications. Crafted in stainless steel, these boilers feature a 9:1 modulation ratio to enhance efficiency and longevity by minimizing on/off cycling. With outputs from 50kW to 250kW, they can also be configured for cascades up to 700kW. They boast up to 97.3% gross seasonal efficiency with weather compensation for optimal performance. User-friendly with an easy-to-read display and advanced programming, they offer simplicity and sophisticated control. Fully ErP compliant, they reduce carbon emissions, aligning with sustainability goals. Available in outputs from 50kW to 150kW, these boilers ensure reliable heat transfer and reduced carbon footprint, making them an ideal choice for efficient energy solutions.. Potterton Commercial Sirius Three Wall Hung Natural Gas Condensing Boiler - 70kW 7705087