Robert Pellegrino of Pellegrino Construction, Salem, N.H., is building a subdivision in Methuen using methods developed by his stepfather, Robert Lefevre, who designed a highly efficient home in Kingston, N.H., using concrete, steel and solar thermal heating. Rather than a furnace, the home is heated using 12-volt magnetic pumps that are run completely by solar power. Allegra Boverman / Staff photo
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