Yer but no but..
If the first combi were on ch + hw, or had a preheat, you'd get less of a slug of CW going into the second, if it did make a difference. Worth insulating that bit of pipe rather well, perhaps.
Heatline asked me about being a repairer for their boilers, at an exhibition. £40 a callout, bit I could specify the patch. It wouldn't be terribly big, at that rate.
If the first combi were on ch + hw, or had a preheat, you'd get less of a slug of CW going into the second, if it did make a difference. Worth insulating that bit of pipe rather well, perhaps.
Heatline asked me about being a repairer for their boilers, at an exhibition. £40 a callout, bit I could specify the patch. It wouldn't be terribly big, at that rate.