Before revision: Energy source Hot-water baseboard-style radiator (top) which is covered (left) and opened (right), with inside view (bottom) showing the aluminium fins which are attached in series to the copper pipe Steam upA cast iron radiator with single-pipe steam supply Steam has the advantage of flowing through pipes under its own pressure without the need for pumping.
After revision: and radiator air ventEnergy source Hot-water baseboard-style radiator (top) which is covered (left) and opened (right), with inside view (bottom) showing the aluminium fins which are attached in series to the copper pipe Steam upA cast iron radiator with single-pipe steam supply Steam has the advantage of flowing through pipes under its own pressure without the need for pumping.