A lot of variables without seeing the installation parameters but individually & very approximate:
Boiler €2,200 - €2500 (depends on decent circulating pump replacement, oil line, remote acting fire valve ease of installation, indoor, outdoor or utility model boiler, etc.)
Cylinder €450 in,coding new immersion
Heating controls €950 - €1,200 (depends on upgrading of your earth bonding back to fuse board, etc.)
TRV's €30 per radiator
Powerflush €450
Discounts would be applied for carrying out all works & could be a lot cheaper depending on layout of the system.