I want to build a copper floor heating, but I don't know the mats. Anyone knows what would be the thickness of copper wire and the distance between the wire on m2?Thanks and sorry for bad English!
Since you mention copper wire, it sounds like you are using electric resistive heating. Copper pipes are used to run warm water thru them to radiant heat because copper transfers heat very effectively. But if you are using wire resistive heating, copper is a poor choice because copper doesn't resist and so you won't get any heat from it. You need a metal that has high resistance to electric flow, like iron wire , nickel, nichrome or even carbon. To calculate heat you must know how much BTU's you need to heat your house. One kilowatt of power converted into heat equals about 3414 BTU's. A 1500 sq ft house might need 60,000 BTU's to heat in 20F weather. So that is about 18 kw of power needed If you use the formula power = current squared * resistance You see that for a circuit carrying 15 amps, you will need 4.4 ohms of resistance per 1000 watts. 1000 watts = 15 amp^2 * R R = 4.4 ohm If you put in copper wire a foot apart, you would never get 4.4 ohms of resistance. So pick materials that make high resistance, like zinc, or nichrome wire
underfloor resistive heating manufacturers have full specs on their websites for calculating what you need
