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International Ground Source Heat Pump Association (IGSHPA)
Promotes the use of the technology worldwide through education and communication. Includes technical and commercial aspects, case studies, publications and conference calendar.
www.igshpa.okstate.edu/

Nevada Source Water Protection
Public education resources about water contaminants, their health effects, sources, management options, and how communities can protect their drinking water sources.
www.unce.unr.edu/

Geothermal Heat Pump Systems
Describes the concept with animated graphics. Addresses installation concepts and mechanisms.
www.geothermal-heat-pump-resource.org/

International Energy Agency (IEA) Heat Pump Centre
Information from the IEA about the technology, applications and markets. Includes FAQs, research profiles and reports, announcements of conferences and events and links.
www.heatpumpcentre.org/

European Heat Pump Association (EHPA)
Non-profit organisation which promotes awareness and proper deployment of the technology in Europe. Includes basics, news, publications, events calendar, project and regulatory information.
www.ehpa.org/

E- Water Heaters
Offering water heaters for commercial and industrial use. Offers online charts and sizing information.
www.ewaterheaters.net/

Geothermal Heat Pump Energy - How It Works
Explanation of the technology basics. Addresses heat extraction technic and mechanisms.
www.geothermalheatpump.com/

American Standard Commercial Water Heaters
Manufacturers of commercial, residential and R.V. water heaters.
www.waterheating.com/

Wikipedia: Heat Pump
Free encyclopedia article covering the technology basics. Addresses background, thermodynamic aspects for different types of heat pumps.
en.wikipedia.org/

Bock Water Heaters
Oil, gas, indirect and electric water heaters,hot water radiant and space heating.
www.bockwaterheaters.com/