We all love a bath from time to time. Taking a bath will cost more than taking a shower. For a 43°C bath filled with 85 litres of water, you can expect to pay approximately 27.15 pence.
So, if you were to have a bath every day, you can expect this to cost you around £99 a year.
The technical bit - how did we work out the above costs?
Data from the Energy Saving Trust shows that the average bath volume is 83.3 litres.
Assuming a 43°C bath filled with 85 litres of water, with a flow rate from the tap of 0.2 litres per second, this will require 27kW of heat from the Heat Interface Unit (HIU) for 425 seconds, or 0.12 hours. With a heat network tariff of 8.38 pence per kilowatt-hour, we calculate the cost as follows:
0.12 x 27 x 8.38 = 27.15 pence