Using Immersion heater on night rate instead of gas?

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Hi Green Team!
My gas price just dropped on to variable rate and with no prospects of things getting cheaper any time soon i was wondering....
I am on octopus Go where electricity is 5p for a period at night...Would it be cheaper / the same price to heat my hot water during this period using the immersion heater in my hot water tank vs using my gas boiler in the day (3.9p). Ive read online that gas boilers are usually only around 80% efficient and this can drop as low as 50% if they are not doing heating at the same time (condensing mode). THis is vs an immersion heater which is in theory close to 100% efficient.
There is also the environmental argument too of using electricity which can be lower carbon (especially at night) vs gas.
Any thoughts?
My gas price just dropped on to variable rate and with no prospects of things getting cheaper any time soon i was wondering....
I am on octopus Go where electricity is 5p for a period at night...Would it be cheaper / the same price to heat my hot water during this period using the immersion heater in my hot water tank vs using my gas boiler in the day (3.9p). Ive read online that gas boilers are usually only around 80% efficient and this can drop as low as 50% if they are not doing heating at the same time (condensing mode). THis is vs an immersion heater which is in theory close to 100% efficient.
There is also the environmental argument too of using electricity which can be lower carbon (especially at night) vs gas.
Any thoughts?
Mortgage Free 22/03/17
MissWillow is my OH!
MissWillow is my OH!
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
Luckily i have an iboost which diverts excess solar in the day time. It also has a timer function
MissWillow is my OH!
I also have an e-golf which i charge at night on GO.
I think im just going to have to switch the gas hot water off and turn on the immersion and see how it performs. I can keep an eye on costs on my online dashboard as i have a smart meter. As you say it would be really nice to burn less FF.
Agreed! Gas is going to get more expensive and whilst the GO night rate might not last forever, its locked in until august next year for me.
MissWillow is my OH!
4kWp S Facing 17.5deg slope (dormer roof).
BEV : Nissan Leaf e+
Are you sure about the timer function? I didnt think mine did but if you hold A for 5 seconds and release and then press A to scroll though you might get to a boost timer?
MissWillow is my OH!