How to make a solar water heater
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Batch solar water heater
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Read PDF guide for making batch solar water heater
Passive solar heater using old water heater

Many ways to do this.
One example: a bare tank is placed in plywood box that faces sun > buy old 40 gallon electric tank from plumber and remove outer shell > remove sediment, flush tank with two pints diluted hydrogen peroxide, replace  anode rod
Tank and plywood are painted black to absorb heat; piece of clear glass is placed over box; box is insulated put drain hole in bottom of box to release condensation > 40 gallon tank + water + plywood weighs 460 lbs >> put expansion tank on incoming cold water line > > temps are too high for plastic pipe > electrically ground tank and copper pipes using #6 copper wire > insulate pipes > design project so cleaning and maintenance are easy.
End of sunny day, you have 40 gallons hot water > or more if you put 2-40's in series >>> hot water cools quickly but lasts until early evening > put insulation over glass when sun goes down > 115V element put on switch can keep water warmer longer and prevent freezing in winter > shower uses 5-9 gallons of hot water > bath uses 12-15 gallons hot > once you start using hot water, cold water enters tank so take all baths-showers in succession > for morning hot water, put 115V 2.5 gallon or 6 gallon under sink > connect under-sink heater to light switch or timer > reducing consumption and planning are key.

Resource:
Anodes and flush heater with peroxide
Photovoltaic water heater Convert water heater to DC photovoltaic
Resources:
Convert water heater to high voltage DC photovoltaic
Convert water heater to low voltage DC photovoltaic
expansion tank Expansion tank
High heat solar require expansion tank on incoming cold water line
Expansion tanks at Amazon
Resources
Expansion Tank Installation pdf
Things to avoid with batch heater
How to install under-sink electric water heater


   2 gallons water in the sun
Set 2 gallons water in the sun inside glass-covered box, and have hot water at dinnertime.
Jose Alano solar collector
Solar collector made from plastic bottles
Do it yourself  ideas at Build-it-solar

Resource:
Long list of do-it-yourself solar projects

wrap water heater     dripping faucet Simple ways to save money with tank heater
There are many ways to save with a water heater without buying expensive heater.
Reducing consumption is best way. Maintain water heater is another.

Resources:
Read 9-ways to save with water heater
How to maintain water heater
How to install under-sink electric water heater
Solar water heater Should you buy commercial solar water heater system?
NO

Resource:
See reasons why you should not buy expensive solar installation
Solar heat is common across globe
Solar heaters in Middle East use collection panels
Buildings in background have solar electric panels on roof
Maybe somebody should clean those solar collectors
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40 gallon electric water heaters at Amazon
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How to replace water heater element Waste King disposal
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