A normal living room will have 2x3KW storage heaters.
an average heater is left on for 8 hours per day so:
6(kw) x 8 (hours) x 0.14 (night rate) =£6.72 per day
The answers ranged from 2-6 hours daily, so for the purpose of the projection we will use 4hours daily as that splits 2-6 hours fairly.
a normal living room would require a 2KW smart heater so:
2(kw)x4(hours)x0.17(normal electricity rate) =£1.36
This equates to £5.36 savings just from one room or £1956.40 annually assuming you use your heating every day.