Gas vs Electric Shower

northernsoul

Well, having measured the actual gas used with a big overhead shower i can tell you that (on the std Octopus rate of 3.94/kWh with a 10 year old Vaillant 837 28kw combi boiler) a

3 minute shower uses 1.32kWh or 5.2p (one reading)
4 minute shower uses 1.88kWh or 7.4p (average of 7 readings)
5 minute shower uses 2.14kWh or 8.4p (average of 6 readings)
6 minute shower uses 2.39kWh or 9.4p (one reading)
Have not taken a shower longer than 6 minutes

To work out an electric shower - your 8kw shower used for 6 minutes will use 10% (6 min / 1 hour ) of 8kw  = 0.8kwh = (at Octopus tarriif of 19.89/kWh) 15.9p

All include VAT

PinkSherbetPip

northernsoul said:

Well, having measured the actual gas used with a big overhead shower i can tell you that (on the std Octopus rate of 3.94/kWh with a 10 year old Vaillant 837 28kw combi boiler) a

3 minute shower uses 1.32kWh or 5.2p (one reading)
4 minute shower uses 1.88kWh or 7.4p (average of 7 readings)
5 minute shower uses 2.14kWh or 8.4p (average of 6 readings)
6 minute shower uses 2.39kWh or 9.4p (one reading)
Have not taken a shower longer than 6 minutes

To work out an electric shower - your 8kw shower used for 6 minutes will use 10% (6 min / 1 hour ) of 8kw  = 0.8kwh = (at Octopus tarriif of 19.89/kWh) 15.9p

All include VAT

That's really helpful, thank you so much for the information.

nologo

Oooo proper data, thanks for that.

nologo

northernsoul

you're welcome.
Just measured my big overhead shower. Its 180mm.
Boiler water temp set at 48C.
Don't know what it goes up to when having a shower but when having a bath it goes up to about 62C (no idea why it goes to 62C when set at 48C.). 
For your interest , a bath full to overflow uses 5.84kWh or 23p (average of 9 readings)

QrizB

Thank you @northernsoul for your dedication to experimentalism   it is appreciated.