... System uses warm water circulated in PEX tubing under the floor to warm your room and your body from your feet ... new or existing homes.2, Leak proof. Installed under the floor in continuous loops without leaky joints.3, Comfort, makes typically ... heathier. Greatly reduces dust and allergen circulation.6, Use any floor covering-ceramic tiles, linoleum, carpet, hardwood, laminate floors.7, Effective, ...