Upgrade to a Condensing boiler - yes or no?
Thanks - very informative.
One point on the modulation - I have an external pump and valves ..
should I go for a boiler with internal pump so the boiler can vary it
as needed .. I presume that using the existing pump will not allow
full control over the flow by the boiler other than on / off.
So many boiler options .. Ideal Icos is on the short list
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