Kelvion GBS757L heat exchangerThe heat exchanger below is replaceable 1 on 1 with the Kelvion GBS757L without having to modify the pipeworkGBS 757L-30GBS 757L-34GBS 757L-40GBS 757L-44GBS 757L-50GBS 757L-60GBS 757L-70GBS 757L-80GBS 757L-90GBS 757L-100GBS 757L-110GBS 757L-120GBS 757L-130GBS 757L-140GBS 757L-150GBS 757L-160