Furnaces and Boilers

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Across
  1. 5. cushions water pressure in hydronics systems
  2. 6. shuts off power to a furnace when not depressed
  3. 8. lights gas entering heat exchangers
  4. 10. controls temperature
Down
  1. 1. shuts off gas valve when furnace overheats
  2. 2. allows gas into burners
  3. 3. proves a draft
  4. 4. keeps dust and debris from entering furnace
  5. 7. circulates water through hydronic heating systems
  6. 9. protects the transformer