Originally Posted by freddyuk
Quick calculation says that is only using immersion for half an hour once a day for 150 days? (excluding standing charge and VAT)
If you use hot water for baths/showers, washing up/dishwasher, washing machine it is not a huge amount of hot water. If you have a cold fill washing machine then you not using that but if you have hot fill machines the solar goes straight in so can be a benefit.
My temp in West Cork now are 50c on the roof and 45c in the buffer. It is a nasty day for solar! 39 tubes into 200 litre buffer. It may have dumped some heat into the DHW cylinder already - but unlikely today.
Including vat excluding standing charge which I and solar Thermal users have to pay anyway.
If you use loads of hot water maybe I can see a few year payback, but not for us as we conserve and we waste as little as possible.
Our yearly electric bill is around 550 per year in total. including a cold fill washing machine and to be honest you would want your washing machine close to the hot water cylinder to benefit as it would be nearly full by the time it fills up, unless you run the tap first.
We don't have a dish washer and a kettle of water does the job nicely.
I'd be more willing to install a night saver meter if I used a lot of leccy over a solar thermal.
If I could have solar thermal for my heating it might be more worth my while, but I would think that would have to be pretty large and expensive and then in winter daylight hours are short.