On Apr 25, 10:47*pm, The Natural Philosopher wrote:
Apropos of something else, I was moved to research my energy costs.

Night time electricity is currently 4.85p per Kwh.

Oil is a staggering 54p a liter.

Oil energy density is 37.5MJ /liter. Which with a 100% efficient boiler
is still 5.184p per Kwh.

Does anyone make electrical central heating boilers?

Get one of these:

http://www.airconwarehouse.com/acatalog/Hitachi_AquaFree.html

Keep the boiler for the odd cold snap.

cheers,
Pete.