Literal question
<svar a="all" v="SI02A033">27. Source of heating in the last heating season:<br /><div class="i1">[Question 27 was asked of dwellings with a central heating device, storey central heating, no central heating but heated by various stoves and fireplaces per question 26.]<br /><br />(You can mark more than one answer.)<br /><br />[] 1 Coal, coal briquettes<br />[] 2 Wood and wood waste<br />[] 3 Fuel oil<br />[] 4 Electricity<br />[] 5 Natural gas<br />[] 6 Liquefied petroleum gas (propane-butane)<br />[] 7 Solar energy<br />[] 8 Other (write in): ____</div><br /></svar></p>
<p><svar v="SI02A033">28. If you marked more than one source under question 27, enter the number of the main source of heating. _<br /></svar>