I'm in the process of converting my open vented system to sealed in readiness for installation of new condensing boiler. Plan is to run flow/return pipework to new location and get Corgi fitter to fit boiler and run new gas pipe. HW cylinder, controls etc already replaced and updated to latest building regs.
Existing (ancient) backboiler is a Glow Worm 240/6 or 246. My question is whether I can run this unit as a sealed system in the interim after converting to sealed but before fitting new boiler ?
I can't find any manuals on the Glow Worm web site (far too old) but neighbour downstairs has identical model and has been running as sealed from new (approx 20 years ago!). Mine was open vented from new due to loft space being available (top floor).
Ed's FAQ mentions the boiler needing "secondary overheat protection". Is there any way I can check? I can't see any reset button on the boiler itself ? Could this be an additional component that would only be fitted to the boiler in the event of it being used for sealed operation ?
Also, is it insanity to try and pressurise an old boiler? All existing rads have been replaced, underfloor pipe work in good condition so leaks there should not be a problem.
My only reason for wanting to run the old system temporarily is that when I get quotes for the new boiler the existing system is proven as working.
Thanks for any help with this.