IPSWHIntegral Passive Solar Water Heater
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For the do-it-yourselfer seeking an inexpensive, easy-to-build solar water-heating system, the integral passive solar water heater (IPSWH, pronounced ips-wah) is a dream come true.
IPSWHs arc called batch heaters because the heart of the system is the "batch" or water stored in the tank(s).