We need a new boiler fitted in a one bedroom flat in London. There's currently a non-condensing unpressurised system (ie header tank) with a hot water cylinder. Pump, gas meter and timer are all in the same cupboard in the centre of the house and the thermostat is on the other side of the cupboard wall - ie the install really should be simple. I realise that we'll need a condensing boiler and the condensate will have to be pumped up to roof level to drain.
I'm reckoning on replacement boiler cost of