21-06-12, 11:18 AM
A direct non-combi replacment should be cheaper since all the other bits are already present.
If you're shorter of space than money, then changing to a combi will free up a bit of room in the airing cupboard (no need for a hot water tank) and if the header tank is in the loft (sometimes they're on top of the HWT) then that could go too.
It would also mean your hot water is at mains pressure which makes for better showers, though if the existing tank is high enough or you've a shower pump or an electric shower running off mains pressure already then there isn't much advantage to changing.
If you're shorter of space than money, then changing to a combi will free up a bit of room in the airing cupboard (no need for a hot water tank) and if the header tank is in the loft (sometimes they're on top of the HWT) then that could go too.
It would also mean your hot water is at mains pressure which makes for better showers, though if the existing tank is high enough or you've a shower pump or an electric shower running off mains pressure already then there isn't much advantage to changing.