Just few notes to BP Husbandry FAQs...

[Egapal]

Yes! I have found it in local shop for sale... They have available:
size (mm) / input (W)
142 x 274 mm / 7W
278 x 274 mm / 14W
414 x 274 mm / 22W
550 x 274 mm / 30W
728 x 274 mm / 38W
866 x 274 mm / 46W

My viv is 1000 x 50 mm so option 22W seems to be the best solution for me right?

However that placement is still confusing me... "they say cover with 10mm substrate for best results". Still I hope I have found the right thing... name is Ultratherm Viv Mat 22 and pictures below.

http://www.fenixgroup.cz/pages/files...s/folie_d1.jpg

http://www.fenixgroup.cz/pages/files...s/folie_d2.jpg

http://www.fenixgroup.cz/pages/files...s/folie_d3.jpg

That is what you need. You place it on the outside of the tank. on the glass. Then you put your substrate in the tank. They say to put substrate over the top because the glass is going to get hot. You want to use the UTH to heat the glass and the glass heats the substrate and the substrate heats your snake and the air. You want to put that on a rheostat or a thermostat though. You absolutely need to regulate the temp. A 22 watt can get pretty hot.