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Project: Batch Solar Water Heater

Stephen and Rebekah Hren, authors of The Carbon-Free Home: 36 Remodeling Projects to Help Kick the Fossil-Fuel Habit, just installed a small solar hot water heater on their North Carolina townhouse. Their house, as you might have guessed, is already carbon-free, so this is just icing on the cake.

If you’re not yet in a carbon-free home, installing a solar hot water heater will save you money and fuel all year round…yes…even in the winter. Here’s a project from The Carbon-Free Home that explains the steps.

Batch Solar Water Heater

Project Time: 3 to 4 days.
Cost: $500–3,000.
Energy Saved: High.
Ease of Use: Variable; depends on climate.
Maintenance Level: Low.
Skill Levels: Carpentry: Intermediate. Plumbing: Advanced. Electrical: Basic.
Materials: Variable, depending on complexity of system; include ball valves, check valves, boiler valves, 75 psi pressure-relief valve, tempering valve, roofer’s caulk, glycol, stainless-steel lag screws and washers, roof collars, panel mounting hardware, flexible and rigid ¾-inch copper piping, pipe hangers, pipe insulation, various copper fittings, hose.
Tools: Soldering kit (including flux, torch, solder, and so on), pipe cutter, measuring tape, drill and drill bits, holesaw kit, razor knife, pencil, screwdriver, hammer, fire extinguisher, rope, ladders.

Sophisticated batch-collection systems are plumbed into household water lines, so the usual household pressure moves the water through the collector, as opposed to a pump moving antifreeze or distilled water through a heat-exchanging system.

Quite a variety of ways exist to plumb batch collectors. The batch collector can be the only source of hot water, or it can feed a backup tank adjacent to the normal tank, or it can feed straight into the regular household electric or gas heater. It is possible to plumb batch collectors with backup gas or electric tanks. This ensures the collector can be bypassed in cold weather or, vice versa, the backup tanks(s) can be bypassed and turned off when it is sunny enough to rely solely on the batch collector. It is also possible to place a batch collector (or any other solar thermal system) in-line with an instantaneous hot-water heater, but it must be a model with incoming water temperature sensing.

Off the shelf, high-end batch collectors are installed in a very similar fashion to the closed-loop pressurized system detailed above. The main differences lie in plumbing—adding the extra backup tank if there is one—and in the fact that batch collectors don’t need a pump or controller because household water pressure pushes water through the collector. High-end batch collectors should come with a plumbing diagram to follow. Three-way (bypass) valves on the supply and return lines allow various configurations, including bypassing a backup tank or bypassing the batch collector. Many plans can be found at the DIY Web site


New French edition of The Resilient Farm and Homestead available

Great news for French-speaking fans of Ben Falk’s The Resilient Farm and Homestead: An Innovative Permaculture and Whole Systems Design Approach. The French language translation is now available from Imagine Un Colibri, from French booksellers, and on Falk’s book is a technical manual that details the strategies he and his team have developed for […] Read More

Prepare! Keep a Grab-n-Go Survival Kit Handy

Are you prepared in the event of a sudden emergency? Blizzard, earthquake, insurrection after the inauguration? We know a lot of people are wondering what’s coming next in the US, as well as the world, given terrorism, politics, and global warming, among other threats. In this excerpt from When Technology Fails, a popular book on […] Read More

A Bloggin’ We Shall Go: Your Favorite Blog Posts from 2016

Ah, 2016 – where did the time fly? It seems like only earlier this year we were excited about designing swales and getting to know more about no-till farming, and we ended up focusing on the heart, ketogenic diets and seeking a bio-abundant future. While the top 7 blog posts of the year don’t exactly […] Read More

Yes, America We Can Make It … Really

Uncertainty got you down? The political world may seem like it’s crumbling around us, but this we know: We can make it, America. Literally, we can make things. Houses. Gardens. Food. Below we’ve selected some of our classic how-to and DIY books (and some new favorites) to help you sustain your self, family, and community. […] Read More

Chelsea Green on Instagram: Our Most Popular Photos of 2016

What a year for Chelsea Green on Instagram! We began the year with 500 followers and are now fast approaching 4,000 photo-loving brewers, gardeners, cheesemakers, permaculturists, foodies, seed-savers, homesteaders, foragers, and more. Our most popular posts of 2016 say a lot about what makes you happy: mushrooms, innovative garden designs and techniques, tiny cabins, and […] Read More