to re-position any replacement to the current 'Diplomat' cast iron model would be very awkward and with an open vented gravity system could I possibly get exemption from John Prescotts 'SEDBUK A/B' ruling by fitting the most efficient alternative (as a condensing boiler might not run at top efficiency anyway without significant modifications all round)Why is there no reference from boiler manufacturers to SEDBUK B grade. I think wet Central Heating is getting too complex and I may consider gas wall heaters instead.Are things improving out there regarding earlier 'teething' troubles with condensing boilers and are conventional boilers still being manufactured?
You could replace your controls if the boiler is in sound shape (the boiler I work on is 30 years old and the piping is over 90 years old) If you have radiators I would replace the steam traps on each radiator if you haven't done so in the last 5 years. These traps are located on the outlet side at the lowest side of the radiator. Also the chemical balance of the water is critical to the proper function and efficiency of your system.
you make some good points. i myself dont think i would ever retro fit a boiler. if i were to put one in today, it would be in a new home, and designed accordingly. i am fearful of old piping starting to leak. i dont know how big your house is but have you considered just switching to a forced air system? efficiency is also a concern with old piping because of the massive size of it. to do it right , it sounds like it may cost you quite a bit , no matter what you choose. at least with forced air, you would benefit all the way around. just dont know how practical it would be for you...
