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The Potterton Commercial Sirius Three boilers have high modulation ratios up to 9:1 for efficiency and carbon emission reduction. These compact, natural gas boilers feature stainless steel construction and suit large domestic, commercial areas, or replacement projects. They offer single outputs from 50kW to 250kW and cascade outputs up to 1mW. With up to 97.5% gross seasonal efficiency, they include weather compensation and minimize cycling to enhance efficiency and lifespan. Users enjoy straightforward operation thanks to a descriptive display and advanced programming. Featuring a lightweight stainless steel heat exchanger, they boast a neat design with castors on larger models for easy installation and reduced footprint. Compliant with ErP standards, they reduce emissions and meet government targets for sustainable energy.. Potterton Commercial Sirius Three Floor Standing Boiler - 70kW 7612361