Literal question
<svar a="all" v="IT01A041 IT01A042 IT01A043 IT01A044"><span class="em">3.6 Indicate the type of fuel or power used to heat water (more than one answer is possible)</span><br /><div class="i1">[] 1 Methane, natural gas<br />[] 2 Electricity<br />[] 3 Solar energy<br />[] 4 Other</div><br /></svar>