Old radiator very rusty (see pic).
Two questions
1. what type of radiator do we need (picture of current connections / thermostat valves attached). Central heating system is condensing boiler with main thermostat in hallway and thermostat valves on each radiator.
2. What size of radiator, or heat output of radiator, do we need?. Room size is 5.88m3 (pic of room also attached)