The Onyx 150 Litre Direct Stainless Steel Unvented Cylinder is a fully electric solution designed for properties without a conventional boiler. It features two 3kW immersion heaters, one for timed use and the other as a backup. For sizes of 170L and above, the primary immersion comes with a Smart Eco thermostat, ensuring consistent and efficient hot water delivery.

Built in the UK to the highest standards, the Onyx Direct Unvented Cylinder is constructed from premium Duplex stainless steel, providing excellent corrosion resistance and long-lasting durability. Perfect for homes and apartments, it delivers outstanding hot water performance, making it an ideal choice for all-electric installations.

Complete with G3 unvented kit that includes:

·       2x Thermowatt 3kW Immersion Heater

On 170L, 200L, 250L and 300L models the second immersion heater is a ‘Smart Immersion’.

·       1x Zilmet Expansion Vessel

·       1x Caleffi Tundish

·       1x Caleffi 22mm Inlet Control Group Set (inc PRV)

·       1x Factory Fitted Caleffi 7 Bar / 90°C Temperature & Pressure Relief Valve

·       1x Factory Fitted Secondary Return (On 200L, 250L and 300L Models Only)