what wattage for a small bathroom?

[xelaris]

The bathroom area is about 2.5 sqm but the available area for laying an electric mat is only 1.3 sqm....apparently the best option is to have about 150w per sqm - so in my case I should look for 375w - should I go for the more powerful mats/cables? - I've seen some cables are rated 10w per linear meter and others 15w....ditto for some mats: some are rated 150w sqm and others 200w sqm (which apparently is only a question of having the same cables spaced a bit closely). If so, wouldn't be better to opt for cables and choosing the closest (more concentrated) pattern?

It is possible to increase the heating area by removing some tiles (some hard work needed) - this area is going to be covered by a shower cubicle...this might be relevant as the cubicle takes probably a quarter of the bathroom (less area/volume to be heated? If so, less wattage needed?)

 

[xelaris]

160w is what you need..

Do you mean I can use the available 1.3 sqm to heat a 2.5sqm x 2.2m volume? Do you mean the total wattage or 160w x sqm? In the latter case it would make 160w x 1.3 = about 200w (that would be great).

 

[xelaris]

I forgot about an important factor....there are Marmox boards covering the whole area - these are about 30mm thick.