I've always been able to drain my central heating system effectively. However, I had a plumber recently fit a new combi boiler and add a couple of radiator. Now only one of the flow/return sides of the system fully drain. The other one keeps most of it's water.
I was thinking perhaps there is some directional valve on one of the new radiators or the boiler (GlowWorm flexicom cx).
The boiler and radiators work brilliantly, so I don't think it's been installed wrongly.
I was thinking perhaps there is some directional valve on one of the new radiators or the boiler (GlowWorm flexicom cx).
The boiler and radiators work brilliantly, so I don't think it's been installed wrongly.