Pressure type, use the heatpipe. Model Pack Size (cm) (L¡ÁW¡ÁH) G.W (kgs) Capacity (L) Qty. per 20¡¯ / 40¡¯ Container SPP-470-H58/1800-12-C Water tank 980¡Á51¡Á51 17 100 60 125