Draining water from Alde heater.
When we get back from a trip I drain down. We have a Lunar Clubman SE. I understand that the Alde heater is a closed system and shouldn't be drained down but there is a yellow lever (3 position) which is raised to allow water out, a tap also needs to be
opened to allow water to flow out. Trouble is that when I do this the amount of water that flows out seems quite small, I've never measured it but I reckon no more than a litre. In any case the flow rarely goes on for more than a minute. How much does the
Alde hold for hot water purposes? I'm used to other systems that hold 7 or 8 litres and that discharge that amount when drained. Am I missing something? Is there perhaps some other drainage point for the system? To repeat, I don't want to drain the central
heating part of the System. Any advice appreciated.