Here are some helpful links and plumbing resources:
http://www.theplumber.com
http://www.tsbpe.state.tx.us
http://www.premierfaucet.com
http://www.doityourself.com/pluming
http://plumbingweb.com
http://www.plumbnet.com
http://www1.eere.energy.gov/consumer/tips/water_heating.html
http://www.dsireusa.org/
