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gillies
Heat pump vibe is low temp, big rads and good insulation. Gas combi is blast gas for a couple of hours with hot rads.
Low and slow if you can limit heat loss and are in the house all day. I think running a combi at the lowest flow temp you can get away with is also more efficient, something about them not actually condensing when run hot, no heat is recovered from the flue gases, energy is just pumped out the hole in the wall.