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Letters: Plumbing Retrofit

May/June 2006
This article originally appeared in the May/June 2006 issue of Home Energy Magazine.
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May 01, 2006
Plumbing Retrofit         I’ve recently completed the California Building Performance Contractors Association (CBPCA) training program and have become a subscriber to your magazine. One year ago I bought an old home on San Pablo Park in Berkeley with all original plumbing, heating, and electrical systems. I am in the process of retrofitting the entire house for energy efficiency and comfort.         The Atlas Gravity Heater has been replaced by a 92% efficient, electronically commutated motor (ECM) forced-air system with all new (and properly installed) ducting. I have just fired up a new exterior-mounted direct-vent Rinnai 2532W tankless water heater. The heater itself is performing well, but I am concerned about convenience versus energy and water consumption.         The system is plumbed in a traditional way. The trunk lines are all 1/2-inch copper to each fixture area, then 1/2 inch to the fixtures themselves. The heater is mounted on the outside wall of the bathroom and therefore favors the bathrooms in terms of quick delivery of heated water to the fixtures. The kitchen is on the other side of the house, which results in longer wait ...

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