it should not be about resale vaule, but comfort and running costs.
€5000 plus VAT = €5700
Boiler Condensing = €1200 - €1500
Pump €80
Oil tank €300
Cylinder, indirect insulated 130L with immersion =€200
7 rads with thermostatic rad valves @ €100 each = €700
towel rail = ??
Two channel time clock, 2 motorised valves, one room stat, one cylinder stat (Required under building regs)= €200
Pipe,fittings, tanks in attic, vaules, filters,inhibitor, cement to fill in holes etc = €300 - €500
Labour €1400 - €1800. May require an electricain to wire controls.