We need to replace our boiler. Should we go to gas or stick with oil?

— Helen Torris Montclair, NJ

Answered by Raymond Pruban on December 29, 2010

Do tankless water heaters have to be flushed annually?

— Joan Buffalo, NY

Answered by Scott Johnson on December 23, 2010

Is there a system on the market that recycles used shower water back to the showerhead?

— Grant Arnold Falls Church, VA

Answered by Randy Potter on November 14, 2010