Storage Heater room volume v kWatt

[AndyPRK]

I am struggling to make up my mind about the bathroom heater though.

Plan was a screwfix panel heater. Theory is that it should be nice and warm in the morning when you want it.

or would I regret not having a small storage heater.....

 

[AndyPRK]

There is a formula but first you need to tell us the volume of your room.

Generally though a 2kW heater will suffice.

room is 4.3 x 3.7 m
height 2.5 m

considering
2.55 or 3.4 kW


(for my own notes a heater width around 80cm or 1.6m for the wall it's going on)

 

[AndyPRK]

width x length x height x 0.12 = kw required.

= 4.77 kW

 

[AndyPRK]

Can anyone help me with this please.

There are some heaters finishing on ebay in the next couple of days which are local to me.

Thanks

 

[ban-all-sheds]

Well I appreciate the formula as a rough guide.

I was going to select higher anyway as it is a VERY VERY cold room.
(seen ice on the inside of the window)
Just wanted to be sure I didn't get one too small.

I think I want a storage heater as this will hopefully put heat into the room all the time, and if I set the vents open, lots at night.

c) Facing west
d) 2 external walls
e) yeap 1 drafty window lol
f) Single glazing sach window
g) No Heated room below (garage)
f) loft above

Don't even think it has cavity wall insulation.

You really, really, really need to cut down the heat loss, or you might as well build an open fire in the middle of the floor and burn banknotes.

How much insulation is there in the loft? How much under the floor? Could you fit secondary double glazing? Could you put CWI in?

Storage heaters will not put out heat all of the time.

 

[DetlefSchmitz]

Deleted, double posting

 

[DetlefSchmitz]

For each wall, floor or ceiling area write down the:

- Area in m²
- U-value
- Worst case temperature difference though that wall/floor/ceiling in ºC

So if the room the other side of the wall is the same temperature (worst case) then no heat will be lost that way.

For a wall with glazed openings, split the area into non-glazed and glazed parts and calculate separately.

Typical U-values for a house built three years ago would be:
Exterior wall - 0.35
Glazing - 2.0
Internal wall - 1.7
Ceiling - 0.6
Downstairs Floor - 0.25

For each element of area multiply:
Area x U-Value x Temp Difference

e.g.
Ext wall: 30m² x .35 x ºC = 231W

...and so on. Add all these up and you have the worst case continuous heat required for that room.