Have noted the post re "draining an open vented system", which unfortunately wasn't right for my situation.
I "own" a detached 7-yearold 4-bed property on a medium sized, fairly 'upmarket', modern development so would have expected at least similar standard of plumbing etc etc to that of my previous, [owned from new] and similarly valued, albeit, roomier 10-year old 3-bed property. However, I find there are - unlike the previous house - no drain cocks at all on [b]any[/b] of the radiators: my previous, house, on a smaller development had them on every rad. I had no trouble draining down this system,(in order to relaocate a radiator), but in this [newer, more(?) modern] house there is no 'convenient' connection I can make in order to drain down the system. I want to fit thermostatic valves to all but two of my 10 rads so I will, of necessity, need to drain down the entire system.......... won't I?
My CH is a sealed system and is serviced by a Saunier Duval combi gas boiler, which contains a small reservoir as a back up for full flow hot water and which works very well: I do not really want to drain down the boiler (the reservoir) as I feel it will not only make the task more protracted but is also, as I see it, unnecessary.
I do not, however, know where the isolating valves are on this boiler to prevent its draining down.:=(
What would be the best, most effective approach to "getting round" the draining issue? And, with the existing rad valves sitting very close to the regular steel panel rads will I indeed have enough room to actually fit thermo-valves?