My new build house has pressurised heating system.
I noticed there is occasional tiny leak from lower gate valve at heating pump.
After pump stops working ,couple hours later Lower gate valve leaks a little water only and stops.
If I need to drain system to change gate valve in near future how we meant to drain system?
There’s no drain valve on any radiators.
There are only two drain valves connected to hot/cold pipes in hot water cylinder cabinet and two drains valves connected to hot/cold pipes under kitchen sink near mains cockstop. Any ideas would be much appreciated.I just want to be ready with knowledge before calling plumber.
Thank you