RewardsVita Concord Slimline Concept Vita Concord Slimline Concept Size (mm) Output Type Points Qty H1800 × L320 872W / 2975BTU SINGLE 336 -+ H1800 × L440 1199W / 4091BTU SINGLE 419 -+ H1800 × L520 1417W / 4835BTU SINGLE 456 -+ H1800 × L640 1744W / 5951BTU SINGLE 544 -+