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Solar Hot Water the Best of the Best

When talking about solar energy systems – that is, photovoltaic (PV) panels and thin film solar irradiance collectors that produce electricity – most people neglect the obvious; solar water heating.

Penny for penny, and pound for pound (in terms of system weight, at least), solar water heating is one of the best investments a homeowner can make to reduce energy use and his, or her, carbon footprint. This is because heating water is one of the costliest aspects of running a home. In fact, a recent graph by the U.S. Energy Information Agency, or EIA, shows hot water running third after home heating and lighting. Another chart shows hot water tanks consuming an average of $45 per month, all year round, while a (hot-air) heating system, used only in winter, consumes about $27.

That is why recent news from Pittsburgh, Pennsylvania – that five firehouses are installing solar water heating systems – is so encouraging. As Rep. Chelsa Wagner (D-Beechview) notes, it’s a “simple, reliable, and cost-effective way for Pittsburgh to begin the transition to green energy."

The firehouses, No. 17, 23, 26, 27 and 29, will get solar water heating systems through Pennsylvania’s Solar Energy Program, which has matched funds of $47,043 for the installation.

The state, which has a Renewable Portfolio Standard (RPS) of 18 percent of generation from renewables in 2020 (.05 percent of that from solar), is one of the least forward-thinking in terms of reducing fossil-fuel generation, so any move toward clean, renewable energy is a step forward. To its credit, however, $23 million in new grants and loans have been pledged – funding which Gov. Edward G. Rendell says will help triple the state’s renewable energy capacity.

In Vermont, public park restrooms and bathhouses are also going green, with $600,000 voted by the state’s Legislature for the installation of solar water heaters at the various locations, according to Gov. James Douglas. The funds are part of the Vermont Department of Forest, Parks and Recreation 2010 budget allocation, which totals $5 million.

According to Parks Department Commissioner Jason Gibbs, the department’s plan is to insure that there is at least one solar element in every state park in the system, including Emerald Lake, Lake Shaftsbury and Woodford State Park. Solar water heating systems for showers already exist at Little River, Molly Stark and Smugglers Notch State Parks, and a unique water system at Underhill State Park is completely powered by photovoltaic panels.

Vermont is one of the few states with a voluntary RPS, though it has set a goal of 20 percent of generation from renewables by 2017. In Hawaii, recent legislation (SB 644) requires new, single-family homes built after the end of this year to have solar water heaters. And in California, the Solar Water Heating and Efficiency Act of 2007 establishes a 10-year initiative to install roughly 200,000 solar water heaters in homes and businesses throughout California.

The program, launched with the installation of 22 systems on low-income, single family California homes, is being monitored via HOBO U30 Remote Monitoring devices to determine their efficacy. However, California’s current fiscal crisis may put paid to the program before it gets beyond the first 22 because, even though it is funded through the state’s Petroleum Violation Escrow Account (PVEA), the funds may have to be allocated elsewhere.