Underfloor heating

Modern underfloor electric heating is not a source of EMFs, but some systems installed in the past can be a source of magnetic field.

In the past, underfloor heating systems sometimes used a single heating wire, laid round the floor area in a big loop to come back to the connection point:

diagram showing old-style undefloor heating

Because this makes a single big loop, it was a source of magnetic field (the wire used was usually screened so there was little electric field).

Nowadays, a different system is used, where the "go" and "return" conductors are in the same cable.  Instead of having to come back to the connection point, the cable simply zig-zags across the floor and stops:

diagram showing new-style undefloor heating
There is now no loop, and because the currents in the cable are balanced, there is negligible external magnetic field.