11. Geothermal heat pumps are economically viable essentially anywhere in the world. 12. I never really would have thought a heat pump would be that significant. 13. The product range includes biomass boilers, solar collectors and heat pumps . 14. Air-source heat pumps are inexpensive relative to other heat pump systems. 15. Heat pumps and oil-fired furnaces and boilers need a yearly tune-up.16. Air-source heat pumps are inexpensive relative to other heat pump systems. 17. New improvements included modern electrical equipment and a geothermal heat pump . 18. Heat and design culculation of refrigeration machines, heat pumps and heat-transformers. 19. Lapka offered another alternative to heat the apartment : heat pumps . 20. Air source heat pumps can provide fairly low cost space heating.
