|Because the design of the enclosure is non-essential to the proper functioning
of your batch heater, we'll limit our discussion of this step to a general run-through of the major concepts and
procedures. Only you know what type of
exterior enclosure will work best at your home, so we'll leave the specific details
of this one step to you.
Building a batch heater isn't very difficult, and if you know how to hammer, saw, and solder, the entire job should take about five weekends, tops. Your best bet is, first, to read through the following pages to get a feel for the scope of the project. As you read through the step-by-step procedures, you'll find numerous terms in italics, such as tank support bracket and involute center cleat. The italics mean that these specialized (Continued page 29)
Photo Three The mirrorlike Mylar should be handled carefully and protected with newspapers to avoid
scratches. Here, one of the plywood involute patterns is about to be used as
a template to cut out a section of the Mylar. Each component of the reflector
should be fitted with its own individually cut piece of Mylar to allow for
slight differences in size and shape.
Photo One Following the instructions in the text, it's easy to draw the correct involute and cusp for any tank using only a length of wire and a pencil. Here you can see how the curve is formed automatically as you move the pencil away from the tank. The plywood will be cut along this line to create the "involute patterns" shown in the next steps.
Photo Two The "flashing layout line" will help you mount aluminum flashing
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28 RODALE'S NEW SHELTER JULY/AUGUST 1981