U-Value: 0.97 W/m2°K
The area of the wall is: 17.9 m2
The calculated degree hours are: 37,440 °K h
Using the units for U-Value W/m2 °K
m2 and °K cancel.
Product of the above figures.
0.97 x 17.9 x 37,440 = 650,071 Wh
@ 8p/kWh 650 kWh per annum
£52 / year heating cost