I've got to move some of the central heating pipes tonight/tomorrow and have a combi boiler which says I should consult a plumber to drain/refill blah blah. My head says that it can't be that hard...
Drain ====== Turn off boiler Isolate heating circuit from boiler using the valves just below the boiler.
Close the valves I stuck in last year that conveniently isolate the section of pipe I need to work on, minus one radiator which I'll close the valves on.
Do the work =========== Stick a hosepipe on the drain valve, and get any water out of the pipes that feels like coming
Do my work, expecting to get a little wet because the pipes will still have some water in.
Refilling ========= Open up all valves. Turn thermostat *right* down so that boiler does nothing when I turn it on. Turn on boiler (but with heating functions off) because it has a digital pressure readout, so I need it on. Refill system. Use built in filler loop (Glowworm 30ci plus) to get up to pressure. Go round and bleed rads and fill up as necessary.
Questions =========
Anything wrong with this?
If I don't finish the pipe work then I realise I'll have to either cap the pipes or sort out my TRVs if I don't want a flood overnight. Meanwhile, can I run the boiler with just domestic hot water on, or will it rely on the heating circuit to dump excess heat in some circumstances?
Is there any reason I couldn't run the heating with just the two radiators that are boiler side of where I'll cut the pipe? My intuition says yes and that this is a silly question, but I just thought I'd check.