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Optimising my viessmann boiler

Optimising my viessmann boiler

Optimising my viessmann boiler

Hello

Not sure if this is the right place to ask, apologies if not.

Had a viessmann boiler installed in the summer and looking at my gas usage it's not using much less than my old non condensing 36kw cast iron 1990s lump. The new boiler is 32kw, so perhaps that's why, and it's not been setup particularly with heat loss etc, so I'm wondering if it's even condensing. It does modulate nicely down, seen it around 8%, but I don't think that means it's condensing, or does it?

How can I tell if...

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by dormermike

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