Compact and lightweight, Sirius three WH condensing boilers are supplied with a stainless steel heat exchanger and offer a market-leading modulation ratio of 9:1. Supplied with weather compensation as standard to ensure high seasonal efficiency all year around. Available in 50, 60, 70, 90, 110, 130 and 150kW outputs offering up to 660kW with optional cascade pipework kits. 70kW model.
- Stainless steel heat exchanger - designed for maximum combustion performance and energy efficiency
- Very compact design and reduced weight - Easy to install in small spaces
- Room sealed flue - Suitable for use in living spaces
- Weather sensor supplied as standard - Output varies according to outside conditions, reducing running costs