Below are a number of links that we have found useful in providing good information for those doing research into purchasing solar heating equipment or systems.

Some National Renewable Energy Lab (NREL) links

Introduction to solar hot water
www.nrel.gov/clean_energy/solarhotwater.html

Solar hot water for homeowners
www.nrel.gov/clean_energy/home_solarwater.html

Solar hot water for electricity providers
www.nrel.gov/clean_energy/solarhotwater.html

Solar hot water for farmers and ranchers
www.nrel.gov/clean_energy/farmer_solarwater.html

Solar hot water for small business owners
www.nrel.gov/clean_energy/smallbus_solarwater.html

Solar hot water for students and teachers
www.nrel.gov/clean_energy/teach_solarwater.html

Some Energy Efficiency and Renewable Energy Network (EERE) links

Solar Heating Research and Development
www.eere.energy.gov/solar/sh_research_development.html

Solar Heating Basics
www.eere.energy.gov/solar/sh_basics.html  

Solar Heating Consumer Information
www.eere.energy.gov/solar/sh_consumers.html   

Solar Heating-Advanced Applications
www.eere.energy.gov/solar/sh_use_adv_app.html

Solar Heating
www.eere.energy.gov/solar/solar_heating.html   

Solar Heating Basics
www.eere.energy.gov/solar/sh_basics.html#passive  

Solar Heating in Use
www.eere.energy.gov/solar/sh_use.html  

 Residential and Commercial Water Heating
www.eere.energy.gov/solar/sh_use_water.html  

 Space Heating and Cooling
www.eere.energy.gov/solar/sh_use_space.html  

Solar Heating Advanced Applications
www.eere.energy.gov/solar/sh_use_adv_app.html   

Residential Solar Heating Collectors
www.eere.energy.gov/erec/factsheets/heat.html  

Heat Exchangers for Solar Heating Systems
www.eere.energy.gov/consumerinfo/refbriefs/bb2.html  

Heat Transfer Fluids for Solar Heating Systems
www.eere.energy.gov/consumerinfo/refbriefs/ba2.html  

Heating Your Home with an Active Solar Energy System
www.eere.energy.gov/consumerinfo/refbriefs/ad4.html  

Sunspace Orientation and Glazing Angles
www.eere.energy.gov/consumerinfo/refbriefs/c109.html  

Residential Solar Heating Retrofits  
www.eere.energy.gov/consumerinfo/refbriefs/ac6.html  

Solar Energy System Maintenance and Repair
www.eere.energy.gov/consumerinfo/refbriefs/a110.html   

Solar FAQs - Solar Heating - The Basics
www.eere.energy.gov/solar/cfm/faqs/...  

Solar FAQs - Solar Heating - Financial Considerations 
www.eere.energy.gov/solar/cfm/faqs/...  

Solar FAQs - Solar Heating - Getting more educated
www.eere.energy.gov/solar/cfm/faqs/...  

Solar FAQs - Solar Heating - Getting a system
www.eere.energy.gov/solar/cfm/faqs/...   

Solar FAQs - Solar Heating - Benefits
www.eere.energy.gov/solar/cfm/faqs/...  

Solar FAQs - Solar Heating - Applications
www.eere.energy.gov/solar/cfm/faqs/...  

Some Florida Solar Energy Center (FSEC) Links

Solar water heating: A question and answer primer. Questions most frequently addressed to the Florida Solar Energy Center (FSEC) about solar water heating are answered.
www.fsec.ucf.edu/solar/apps/sdhw/en5.htm#figure1

Solar Questions.  The Florida Solar Energy Center has responded to numerous requests for information in its newsletter, The Solar Collector. Here are some of the most frequently asked questions regarding solar water heating and the answers that were provided.
www.fsec.ucf.edu/solar/questions/questions.htm

System Installation.  This page presents the steps taken in the installation of a particular solar water heating system.
www.fsec.ucf.edu/solar/install/dhwinstl/dhwinstl.htm
There are 10 links from this page to other pages detailing the various component installations as follows:    

Collector mounting
www.fsec.ucf.edu/solar/install/dhwinstl/collmtng.htm

Roof pipe flashing
www.fsec.ucf.edu/solar/install/dhwinstl/flashing.htm

Piping from tank to collector
www.fsec.ucf.edu/solar/install/dhwinstl/piping.htm

Collector feed line piping
www.fsec.ucf.edu/solar/install/dhwinstl/feedline.htm

Collector return line plumbing
www.fsec.ucf.edu/solar/install/dhwinstl/retnline.htm

Storage tank
www.fsec.ucf.edu/solar/install/dhwinstl/tank.htm

Controller and sensors
www.fsec.ucf.edu/solar/install/dhwinstl/sensor.htm

Pump and valves
www.fsec.ucf.edu/solar/install/dhwinstl/pumpvlv.htm

Pipe insolation
www.fsec.ucf.edu/solar/install/dhwinstl/insulat.htm

Final checkout
www.fsec.ucf.edu/solar/install/dhwinstl/checkout.htm