Heatline Capriz2 24kW Combination Boiler Packs ErP 24kW ErP Condensing Combination Boiler Heatline boiler packs from PlumbNation contain cost effective and energy efficient boiler systems for your home. Available with a number of flue and controller options, from leading brands and manufacturers. PlumbNation ErP boiler packs are labelled as part of the EU directive to improve the efficiency of heating and hot water products.