add some insulation to help keep the heat
transferring more effectively from the riser
tube into the secondary heat exchanger. It
will also improve the safety of the riser tube
and elbow assembly, which can glow red-hot.
Connect the riser tube to the burn cham-
ber with a 90-degree elbow (or fashion a
90-degree elbow by cutting a pipe at a
45-degree angle).
Fashion a support and outer chamber wall
to house the riser tube.
Wrap^1 ⁄ 2 -inch copper tubing around the
riser tube as its heat exchanger.
Put the stovepipe directly inside the riser
tube and vent outside the building.Heat Exchangers
Use^1 ⁄ 2 -inch copper tubing. If you’ll be
using a flaring tool to make the plumbing
connections, it won’t matter whether you get
copper tube size (CTS) or refrigerant-dimen-
sioned tubing.
Leave the tubing coiled. Remove any pro-
tective rubber caps from both ends and set
them aside.
Rotate the coil and adjust the loops so
that when the coil stands vertically, both
ends of the tubing are pointing up. Place
one end of the tubing in a garden hose, and
turn it on about half-flow until water comes
out the other end. This will force all the air
bubbles out of the tubing.
Remove the hose, taking care to retain
the water inside the tubing, and replace the
caps on either end. Place the tubing in a
freezer for about 12 hours. Ice will push off
the caps and protrude a couple of inches
from both ends. This step is necessary to
keep the tubing from kinking when bending
it around the riser tube.
To create the exchanger coil for the riser
tube, gently straighten approximately 20 feet
of the tubing and tape it to the riser tube.
The tape will hold the tubing in place as you
quickly wind the copper around the riser
tube. The result will be an artful coil remi-
niscent of moonshine stills.
Repeat the process similarly for the burn
chamber, placing most of the coil toward the
bottom third of the chamber, where most
of the heat will be concentrated. Use wire
instead of tape to hold the copper when
winding this coil.
Use stainless steel hose clamps to con-
nect the^3 ⁄ 4 -inch rubber hose to both heathttp://www.MotherearthNews.coM 69Homestead Know-How
Circle #46; see card pg 97Circle #49; see card pg 97800.582.8423
http://www.StiebelEltron.us800.582.8423
http://www.StiebelEltron.usEngineering & manufacturing
excellence since 1924Accelera® 220 E
58-gallon
heat pump water heater
Accelera® 300 E
80-gallon
heat pump water heater› Accelera® Heat Pump Water
Heater is a cost-effective and
green alternative to solar
thermal hot water
› Added to solar electric, only
3 .8 kWh per day offsets annual
hot water energy costs
› Saves 80% compared to a
standard electric tank
› Low carbon footprint
› 3 ” foam insulation for
extremely low standby losses
› Quiet 52 dB sound pressure level
› Superior design from decades
of experienceAccelera® 220 EWelcome to the new
solar hot water
ALL AMERICAN SUN OVEN®
AMERICA’S ULTIMATE SOLAR APPLIANCE!
BAKE, BOIL OR STEAM FOOD NATURALLY
AT TEMPERATURES OF 360 TO 400 DEGREES WITH THE POWER OF THE SUN.
Use as a Solar Dehydrator or to Boil Water with the world’s most universal power source... FREE SUNSHINE!
Baking outdoors reduces the cost of cooling your house, so a SUN OVEN® quickly pays for itself by
saving energy and reducing utility bills.
A SUN OVEN® cooks or bakes in close to the same time as a
conventional oven or stove top... Or slow cook all day.
Use year around. 15 Year Warrantee.
Save $70 Visit http://www.sunoven.com/MotherEarth
Proudly Made in the USA Sun Ovens International (800) 408-7919p 66-70 Homestead_Hacks.indd 69 10/11/16 11:31 AM