I bought a plug in elec meter to measure how much household appliances cost to run.
The cheapest way to keep warm is an electric blanket, it beats everything else imo. You can get those throw over ones for about £50, they'll save you in the long run as you don't need to heat the whole house via the central heating etc(for example). You only need it on for about 10 mins at a time too, and they stay warm for quite a while.
The rate we pay is about 48p/KWh, so depending on what your tariff is, the table should give you a rough idea...
Kettle | 1 boil | 0.037 KWh | < 2p each boil |
Toaster | 2.5 minutes | 0.050 KWh | < 3p for 2.5 mins |
Microwave | 10 mins on full power | 0.200 KWh | 10p for 10 mins |
TV 30" | 1 hour | 0.210 KWh | 10p per hour |
TV (on standby) | 1 hour | 0.012 KWh | 1p per hour |
Electric Blanket | 1 hour | 0.105 KWh | 5p per hour |
Plug-In Wall Heater | 1 hour | 0.426 KWh | 19p per hour |
Small Oil Heater | 1 hour | 0.180 KWh | 9p per hour |
Air Fryer | 20 minutes on full power | 0.314 KWh | 15p for 20 mins |
Freezer | 1 day | 0.340 KWh | 16p per day |
PC (Browsing Only) | 1 hour | 0.117 KWh | 6p per hour |
PC (Gaming + Browsing) | 1 hour | 0.200 KWh | 10p per hour |
Recharging Phone | 1 hour | 0.001 KWh | < 1p for 3 hours |
Lamp | 1 hour | 0.001 KWh | < 1p for 3 hours |