Thanks Ellenor. 1 bathroom, 1 p/shower over bath, 3 bed detached with good mains pressure. The cylinder is used for the shower and all hot taps. We're so used to our indirect system, that's what we had quotes for (4 olumbers= 3 quotes, 2 of them missing bits or confusing. we know out potential installer, who's done stuff before. 24 kWh Vaillant (or Ideal?) quoted for, as current old Potterton is underpowered (15 rad's of varying sizes).
Knocked out by the complexity of bits and costs and wonder if we're getting the right system. The cylinder is only about £250 so really isn't a concern, but would we be better off with a combi. The boiler is beside the sink and my wife worries about a combi coming on and off whilst she's washing up.
I'm happy to spend whatever but not for the wrong or totally unnecessary installation.