Hi Philip,
If you are not very technical then the home easy route would be the most sensible you would need the following:
2 x he302 on/off sockets - suitable for up to 3kw
1 x he101 SMS base station
1 x SIM card
A huge word of warning, switching of electric heaters whilst unsupervised poses a potential fire hazard however I am sure you know what you are doing.
BR
Chris