1. 
   Heliothermal
   A process that uses the sun's rays to produce heat.
   Found op http://www.neo.ne.gov/statshtml/glossaryh.htm
   
   
2. 
   heliothermal
   heliothermal Any process which uses solar radiation to produce useful heat.
   Found op http://www.wordinfo.info/words/index/info/view_unit/4265/7
   
   
3. 
   heliothermal
   Any process that uses solar radiation to produce useful heat. Related category • SOLAR ENERGY AND POWER
   Found op http://www.daviddarling.info/encyclopedia/H/AE_heliothermal.html
   
   
4. 
   heliothermal
   1) A process that uses the sun's rays to produce heat
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/heliothermal/1
   
   

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