Terma aims to think differently when conceiving its radiator designs and the Rolo Room has versatility at its core with how flexible it can be with the different ways it can be installed.. Rolo features large, chunky 40mm diameter bars which offer a very high heat output.. Manufactured from durable, low carbon mild steel. Rolo features very large internal holes where the front bare is recessed into the rear bar allowing fast internal distribution of the water for super quick heat up times..