E7 varies around the UK from about 4.5p to 6p inc VAT.

Size - storage charge / units - cost @ 6p/unit
- 0.9kW -- 6.3kWhr (units) charge -- 38p
- 1.7kW -- 11.9kWhr (units) charge -- 71p
- 2.55kW -- 17.85kWhr (units) charge -- 107p
- 3.40kW -- 23.8kWhr (units) charge -- 142p

Perspective - that assumes a 100% charge.
- Automatic set to max will only charge to 75% at +4oC overnight and
only charge to 92% at -2oC overnight
- So the above figures are worst case scenario.

Reality - consider winter as 100 days.
- 100 days of winter means a 3.40kW costs £142
- No maintenance contract, no parts every few years

I can understand 14oC in bedrooms that are used.
However your living room NEEDS to be 18oC+.


Dehumidifiers can cost nearly as much to run as a mid sized storage
heater.

#1 - Draught excluder

#2 - Live under a proper duvet if possible, YOUR BODY needs 18oC
environment even if that is just a micro-environment created by a
duvet

#3 - Make CERTAIN that you are on ECONOMY 7 (or similar), you probably
are for £50/month electric

#4 - Fix the storage heater immediately or buy one on Ebay or
Freecycle, they work, they are reliable, they are cost-effective for
background heating (halls, feeding into bedrooms)

#5 - Consider a second storage heater if possible, a cold 3-bed house
needs 2x 3.40kW (called "24kWhr") in the hallway without CWI and only
loft insulation

#6 - Get the loft insulated because you have no chance of heating the
place without insulation up there AND you will suffer horrendous
descending cold air draughts

#7 - Dehumidifier is not a good solution as they blow cold air BUT
will remove moisture, realise though they will struggle at below 14oC

#8 - Seriously consider a thro-the-wall cooker hood run only for pots
steaming, reduce the moisture input into the house anyway you can.
Window & wall fans do sod all compared to a suitable £20-80 freecycle/
ebay/new cooker hood ducted thro the wall. Amazon do 107mm blue-spot
bits for £20 (you can resell on Ebay for £12) and most drills will do
107mm unless you have engineering brick in which case just take bricks
out and use oblong ducting with a round adapter as it makes life
simpler/sane.

#9 - Woman? Wear thick rugby or thermal socks, seriously because it
makes a big difference AND to circulation

Females suffer cold more than Males, whilst it may not be attractive,
find a fleece top to wear which is long - it will make a substantial
difference.

If you ever redecorate the living room, insulate substantially.