Water tank / Green Building & Sustainable Home Renovation Information & Advice

A  copper drain water heat recovery unit in a residential plumbing stack.
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Drain Water Heat Recovery: Efficient Energy Recycling

...water heater only: The preheated water is fed into the cold water inlet of the water heater. Preheating the shower only: The preheated water is sent directly to the cold side of the shower's mixing valve. The balanced approach: The preheated water is split, feeding both the water heater and the shower's cold water inta...

An 8-gallon unit can often suffice for households with low-flow fixtures and qui
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Sizing hot water tanks, why smaller is often smarter

...water tanks are outdated Recovery rate vs. storage capacity What is the best location to install a water heater? Health and safety: the Legionella factor Maximizing efficiency with drain water heat recovery In brief Why sixty-gallon hot water tanks are outdated Standardized tank sizing, popularized in the 1970s, was ...