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The Tempest Indirect Heat Pump hot water storage cylinders are ideal for air or ground source heat pumps as the main heat source. Made from quality Duplex stainless steel, the cylinders are supplied with 3 kW immersion heaters that have been factory-fitted for back-up heat. They also feature a purpose-designed coil with a 3.3m surface area - these coils offer the maximum amount of heat transfer of renewable energy into the stored water.Features & Benefits: Telford Tempest Indirect Heat Pump Stainless Steel Slimline Cylinder - 150l, Suited to air or ground source heat pumps as the main heat source, Duplex stainless steel structure, Purpose-designed coil with a 3.3m surface area, Factory-fitted 3 kW immersion heaters for back-up heat. Telford Tempest Indirect Heat Pump Stainless Steel Slimline Cylinder - 150l TSMI150HP/SL