The best way to drain your system is from the boiler, but a plumber / gas engineer would be recommended to do this, isn't really a DIY option. More drastic measures could be removing a radiator but again we can't advise that and I imagine it to be very messy. I would call a plumber / gas engineer out to drain the system and fit a drain valve whilst they are there. Hope this helps
Once I've drained out the system can the boiler go back on? Silly question maybe but if the work will take a couple of days (plastering, radiators removed) but we need hot water in the meantime?
Hey great question! If you have removed the radiators be sure to cap off the pipes or join them up to allow the boiler to fill up with pressure. This will let you use hot water. If you haven't removed the radiators its rather pointless draining in the first place as it would need doing again after turning the boiler off.
If following the steps in this video, the pipe will have next to no water left in it as you are draining directly from the pipes that feed the radiator. If you drain from the boiler (not advised in this video) will be a different outcome
Does this method also drain the boilers expansion vessel
This will drain the expansion vessel of water, but not air necessarily. Hope this helps
Erm no mention of the property that don't have drain valves
The best way to drain your system is from the boiler, but a plumber / gas engineer would be recommended to do this, isn't really a DIY option. More drastic measures could be removing a radiator but again we can't advise that and I imagine it to be very messy. I would call a plumber / gas engineer out to drain the system and fit a drain valve whilst they are there. Hope this helps
Once I've drained out the system can the boiler go back on? Silly question maybe but if the work will take a couple of days (plastering, radiators removed) but we need hot water in the meantime?
Hey great question! If you have removed the radiators be sure to cap off the pipes or join them up to allow the boiler to fill up with pressure. This will let you use hot water. If you haven't removed the radiators its rather pointless draining in the first place as it would need doing again after turning the boiler off.
After draing down combi what amount of water is left in 10mm pipe that feeds radiator
If following the steps in this video, the pipe will have next to no water left in it as you are draining directly from the pipes that feed the radiator. If you drain from the boiler (not advised in this video) will be a different outcome
I think Chris meant the amount of water in pipes that are below the drain point
Would help if there was a physical demonstration not just sitting there taking about it !
Thank you for the feedback on this, will definitely improve in the future