Hi,
I am a reasonably capable DIY plumber and have done most types of re-plumbing/repairs etc. However I have no experience of draining down, re-filling on combi boiler systems. Hence my query here.
I am installing a new downstairs bathroom and I need to replace the rusting radiator that is there at the moment. I have full access to the pipe work under the floor boards as there is a 3' foot gap below the floor to the foundations in which to crawl around.
The new radiator (plus TRV) is a different length to the one that is being replaced so can't just connect up to existing pipework.
Plan A.
- Shut off both valves of all radiators, go under floor with bucket, pipe cutter and copper push-fit isolating valve (set to "off").
- Cut through one of the pipes, expect a drench of water, push on push-fit valve.
- Ditto with other pipe.
- Remove old radiator, re do pipework.
- Connect new pipework to isolation valves and open valves.
- Bleed radiator, check combi boiler pressure and re-fill if necessary.
Plan B. Drain whole system, new radiator etc and re-fill with new rust inhibitor.
Would Plan A work? My main concern is the amount of water coming from the cut pipe before I cap it with the valve - seeing that it is a closed (ie pressurised) system?
Thoughts - better suggestions?
Thanks. Rog