On 30/01/2011 14:40, curious wrote:
I am thinking of changing from a warmflow bluebird oil boiler to gas but
don't know whether to go for a combi gas boiler or stay with my current
setup of stored hot and cold water. We had a water cut of 3 days in the
new year and stored water was a blessing so what are the main advantages
of a combi. Gas heating is still in the minority in Northern Ireland at
the moment but catchingup.

I too am considering the options in case my 25-yo boiler gives up the
ghost. The combi needs good pressure mains, I believe; have you got it?

It looks like, if you are upgrading or replacing (as opposed to
installing fresh), the combi is the most drastic option. I see from the
wiki and from the Vaillant and Worcester websites that there are two
non-combi options: open-vent (the same as what you and I have) and
sealed system (which only does away with the cold-water tank). I am
still not clear of the benfits of each set-up, so I will stop here.

Kostas

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